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2011年12月Lovejoy 彗星(奇迹般的逃出太阳)实时更新影像

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 楼主| 零度星系 发表于 2011-12-20 12:57 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
来源于香港天文学会
STEREO HI1-A在12月18日至19日期間拍攝 Lovejoy 彗星的彗尾變化動畫


                               
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 楼主| 零度星系 发表于 2011-12-20 12:58 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
来源于香港天文学会
法國 Breil-sur-Roya 在12月17日用 8 cm 折射望遠鏡 DMK21 相機拍攝 Lovejoy 彗星


                               
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 楼主| 零度星系 发表于 2011-12-20 13:01 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
HINODE SOT image, courtesy JAXA/LMSAL OK, so I said I wasn't going to post this weekend, and I genuinely had no intention of doing so (as it's a pain to do it from home, for one thing) but I have to share this wonderful news: we are six for six with spacecraft observations! The Japanese (JAXA) Hinode spacecraft successfully imaged Comet Lovejoy!

The image you see here is from the "SOT", or Solar Optical Telescope, and if you click to make it bigger you'll clearly see comet Lovejoy sitting in the lower-left corner of the image. In this image, most of what you are seeing is just Lovejoy's nucleus and inner-most part of its coma. Very little tail is observed here, and in fact some of the elongation you can see is due to motion blur as the comet was flying so fast through the images. I also want to add that in the original data, the Sun was massively overexposed in order to enable a detection of Lovejoy, which of course was several orders of magnitude fainter. So the author of this image has inserted an unsaturated image of the Sun, siply to make the image prettier and easier to visually interpret.

This information was sent to me via eamil from the excellent guys over at The Sun Today, so many thanks to them. The Hinode team had to do some very special observations in order to detect Lovejoy, and we a enormously grateful that they did! I stil have not checked in to two other Hinode telescope that hoped to see the comet. I will try to do that today but if not then it will definitely be tomorrow.

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 楼主| 零度星系 发表于 2011-12-20 13:01 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
1400UT: I can't imagine that this week can possibly hold the excitement of last week, but we certainly have some things to look forward to, and who knows what surprises Comet Lovejoy still has for us?

So in terms of things to look forward to, the main thing we're talking about is data. We now know that all six spacecraft -- none of which are cometary missions -- we able to get detections of the comet on at least one of their instruments. We are still waiting for a response from STEREO-A (EUVI), SDO (HMI and EVE), and Hinode (XRT, EIS). In all of these cases we're waiting for the data to be downlinked from their respective spacecraft and then processed into an easily-accessible format. I only work on the STEREO and SOHO missions so I'm not sure when the other missions will have their data ready, but colleagues of mine are also involved in both SDO and Hinode so I plan to start knocking on doors this morning. Later this week I'll put out a list of all the instruments on all the satellites that successfully imaged Lovejoy in some manner or another.

We also still have ongoing observations from space. Lovejoy may have left the LASCO fields of view now but it remains in the STEREO A and B HI-1 fields of view, and in HI-1A in particular, it's looking spectacular! That image I just linked to is a very low-resolution 'real-time' image from STEREO/SECCHI. We use those images for realtime detection of space weather events (coronal mass ejections, etc), so they're not great for comet viewing. They do provide a wonderful preview of what's to come though! I will resume annoying my SECCHI operations colleague and get her to pull that data down as soon as possible. I will certainly make it available as soon as I have it.

If you don't want to wait for those images, fear not, as Lovejoy is now visible again from the ground! And indeed it's actually more visible now than it was before it plunged through the solar atmosphere! (So much for the comet I said would never survive perihelion...) A multitude of ground-based observations of Comet Lovejoy are being reported now, and for the lucky folks in the Southern Hemisphere, this comet is just going to become easier and easier to see.

So what surprised could Lovejoy have for us? It's hard to say as we've already been well off-the-mark in several respects. My prediction a couple of weeks ago of approx mag -3 or -4 peak magnitude was shockingly good (it was luck, I assure you), but I was totally wrong about the survival prospects of this object. We thought the comet was only a couple of hundred meters in diameter, based on its brightness prior to reaching the Sun, giving it no chance of survival. Now we know it has survived, and therefore must be bigger than we thought. The rough guideline is that a comet would need to have a nucleus of about 500m to be able to survive as well as Lovejoy has, so my latest estimate of the (pre-perihelion...) nucleus size would be something on that order. It's going to be much smaller now as the intense solar heating would have taken its toll.

Another surprise was how Lovejoy has both regained and sustained its intense pre-perihelion brightness. As it raced through the solar corona, Lovejoy's extensive dust tail was completely severed, and thereafter gently floated towards the Sun while its head raced one without it. As it re-emerged from perihelion, all that remained was an intense, condensed nucleus that seemed a shadow of its former self. But within just three-and-a-half hours, it underwent a sepctacular resurgence to return to its former glory! I really did not see that coming, nor did I envision that it would become as bright as when it plunged in, that its tail would re-grow so strongly, that its ion tail (the thin one you see [url=http://soho

                               
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]here[/url]) would strengthen more than ever, and that it would begin to grace the Southerh Hemisphere skies as it is now beginning to do.

What could be left for it now? What does fate hold for Comet Lovejoy? Well, some component of it will survive now to return into its several-hundred year orbit, and indeed I am comforted by the thought that Sun-watchers in a few hundred years will recall these images and this story, and remember all who have played a part in it. But it's not all smooth-sailing for Lovejoy. It has been through the most hostile environment that our solar system offers, comets are low-density objects, and scars don't heal. If Lovejoy has suffered any serious fractures then at any time it could fragment into one or more pieces, and its still close enough to the Sun to evaporate significantly. It is, however, headed out of the "bottom" of the solar system, and does not encounter any planets or major bodies out there (the Kreutz orbit takes it well inside Mercury's orbit) so it has a really good chance to survive and return to our future descendents.

当前Kp指数估计值(三小时平均),当Kp指数达到6或以上时,我国境内有可能观察到极光;当前极光活动水平,极光为9时漠河可能见极光,
预计未来24小时地磁暴最强可达级,当地磁暴级别达到G2或以上时,我国境内有可能见极光
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 楼主| 零度星系 发表于 2011-12-20 13:02 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
Comet Lovejoy in STEREO/SECCHI EUVI-A = Wow! (Click for an animation.)
1800UT: This is extraordinary! CLICK HERE for a Quicktime .mov movie showing Comet Lovejoy in STEREO/SECCHI's EUVI-A imager's 171-Angstrom wavelength. (I'm working on an animated gif too, and will post that soon. Click the image opposite for an animated gif)

I'll hold while you hit play a few times...

Not bad, huh?! So what's going on there then??! Well clearly we see the tail wiggling again but this time it looks like the entire comet is dancing about in and out of the corona! Of course it's not -- that's an optical illusion facilitated by the way the tail is moving around. If you were to plot the comet head positions you would see they follow a perfect smooth curve. That tail does not though! What seems to be happening -- and this is my very preliminary reaction that could be as accurate as my Lovejoy-will-never-survive prediction -- is that the charge-free dust in the comet tail is being rapidly charged as it leave the comet and is basically "clinging" to, or certainly interacting with, magnetic field lines in the corona... somehow. Throw in some Fairy-dust and there's your explanation!

Later today I should have a movie from EUVI on STEREO-B which was around the back of the Sun at the time, and got to see the entire transit of the comet through the corona! I'll post that when I have it, so keep checking back or follow me via @SungrazerComets[url=]on Twitter.[/url]
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weiarc 发表于 2011-12-20 16:49 | 显示全部楼层 来自: 中国–广东–深圳 电信/深圳大学
意味着可以肉眼观察了?
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 楼主| 零度星系 发表于 2011-12-20 20:36 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
Very quick update: Awesome animation of Lovejoy in HI1-A again. Note the amazing ion tail! (That's the thinner one.) The raw FITS files for this movie are available here as a 144MB Zip file.

I may not be able to get much info out tomorrow, but will again on wednesday. If any amazing movies crop up though, I will certainly get those out.



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suhuasky 发表于 2011-12-21 08:23 | 显示全部楼层 来自: 中国–湖南–常德 电信
本帖最后由 suhuasky 于 2011-12-21 08:27 编辑

Lovejoy_21-12-11a.jpg IMG_2663_web_IIS.jpg 2011w3_11_12_20_50.jpg IMG_2650_web_IIS.jpg Comet Lovejoy 21-12-2011 WA.jpg

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这也太壮观了吧  详情 回复 发表于 2011-12-28 23:11
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yemingxp 发表于 2011-12-21 08:47 | 显示全部楼层 来自: 中国–广东–深圳 电信
国内有没人观测并拍摄到?  
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 楼主| 零度星系 发表于 2011-12-21 12:37 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
yemingxp 发表于 2011-12-21 08:47
国内有没人观测并拍摄到?

来源于香港天文学会

新西蘭 Minoru Yoneto 在12月20日用 Canon 相機拍攝 Lovejoy 彗星


                               
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 楼主| 零度星系 发表于 2011-12-21 12:58 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
file:///C:/Users/Administrator/Documents/Tencent%20Files/446469755/Image/JR6I9$_BA9%60OG%7D%25%253]G(BI6.gif
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 楼主| 零度星系 发表于 2011-12-21 13:22 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
COMET LOVEJOY IN THE MORNING: Noted astronomer John Bortle urges observers (especially in the southern hemisphere) to "begin searching for Comet Lovejoy's bright tail projecting up out of the morning twilight beginning at dawn. The tails of some of the major sungrazing comets have been extraordinarily bright. Comet Lovejoy's apparition has been so bizarre up to this point that it is difficult to anticipate just what might happen next ... [including] the exact sort of tail it might unfurl in the morning sky."
UPDATE: This morning in New Zealand, Minoru Yoneto photographed the ghostly tail of Comet Lovejoy shining through the twilight:
"I couldn't see the comet with my naked eye, but a 1.3 sec exposure with my Canon Kiss X2 digital camera revealed Lovejoy's long tail."
In the clearer skies of Devonport, Tasmania, amateur astronomer Peter Sayers did see the tail with his unaided eyes--"but just barely," he says. "The tail was just naked-eye and perhaps a degree long in our Tasmanian summer early morning twilight." [image]
The visibility of the tail could improve in the days ahead as the comet moves away from the sun and the background sky darkens accordingly. Early-rising sky watchers should be alert for this rare apparition. [finder chart]
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 楼主| 零度星系 发表于 2011-12-21 13:27 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

这是   在哪儿 拍的?

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这也太壮观了吧  详情 回复 发表于 2011-12-28 23:10
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ltc198210 发表于 2011-12-21 19:43 | 显示全部楼层 来自: 中国–广东–深圳 电信
太专业了,搞不懂???
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 楼主| 零度星系 发表于 2011-12-21 22:07 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
THE AMAZING TAIL OF COMET LOVEJOY: Widespread reports of Comet Lovejoy's tail are being received from around the southern hemisphere. The ghostly plume emerges just before sunrise, jutting vertically upward into the eastern sky ahead of the sun.
"I observed the comet with my unaided eye for 55 minutes this morning," says Colin Legg of Mandurah, Western Australia. "I also captured a timelapse sequence of the comet rising as twilight progressed." Click on the image to set the scene in motion:
"In the image you can see 2 tails," notes Clegg. These are the dust and ion tails. The gaseous ion tail is blow almost directly awy from the sun by the solar wind, while the heavier, brighter dust tail more closely follows the comet's orbit.
The visibility of both tails could improve in the days ahead as the comet moves away from the sun and the background sky darkens accordingly. Early-rising sky watchers should be alert for this rare apparition. [finder chart]
more images: from Paulo Morales Valdebenito of San Francisco de Mostazal, Chile; from Kosma Coronaios of Louis Trichardt, Limpopo Province, South Africa; from Willian Souza of Sao Paulo, Brazil; from Grahame Kelaher of Perth, Western Australia; from Minoru Yoneto of Queenstown, New Zealand
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 楼主| 零度星系 发表于 2011-12-22 12:25 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
澳洲 Chris Wyatt 拍攝的 Lovejoy 彗星照片


                               
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 楼主| 零度星系 发表于 2011-12-22 12:28 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
来源于 香港天文学会

西澳洲 Colin Legg of Mandurah 日出前拍攝 Lovejoy 彗星 time lapse 照片。照片很清楚看見該彗星的兩條尾巴。


                               
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高清片段 http://vimeo.com/34007626
lovejoy-lite.gif (6.37 MB) 下載次數:07 小時前



                               
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 楼主| 零度星系 发表于 2011-12-22 12:29 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
来源于香港天文学会

Lovejoy 彗星掠日後估計被太陽蒸發了90%,但它的光度卻較原來計算的光亮,南半球地區肉眼可見。按照目前亮度估計12月24日它的光度是4.7等,而非原先預測的10.2等。


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 楼主| 零度星系 发表于 2011-12-22 12:38 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
C/2011 W3 (Lovejoy)

                               
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Orbit by Minor Planet Center

                               
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Copyright © 2011 by Vello Tabur (Stockinbingal, New South Wales, Australia)
This image was acquired on December 21.7 (UT), using a Canon 400D DSLR camera with a 50mm lens. The tail was about 14 degrees long.
Discovery
Terry Lovejoy (Thornlands, Queensland, Australia) discovered this comet in the course of his comet survey using a 20-cm Schmidt-Cassegrain telescope and a QHY9 CCD camera. On the morning of 2011 November 27, he acquired three images of about 200 different fields. After spending about two hours processing the images, he noticed a set made during November 27.73-27.75 (UT), which showed "a rapidly moving fuzzy object." Lovejoy was not certain what this was and made a note of "possible reflection" and continued examining the other images. The next night, he re-examined the images and noted that the "position, shape and motion didn't appear consistent with an optical reflection...." On November 29.7, Lovejoy acquired a series of images around the estimated position of the object and managed to "capture 6 images that showed a faint but definite fuzzy object near the expected position. Additionally the fuzzy object was consistent in both motion and appearance to the object found 2 mornings earlier." A request was made to "trusted observers," but all attempts on November 30 failed either because of bad weather or "insufficient limiting magnitude." Lovejoy said a communication from Michael Mattiazzo stated that the positions "were similar to that of a Kreutz sungrazer." Independent confirmation was finally made on December 1, when A. C. Gilmore and P. M. Kilmartin (Mt. John University Observatory, Lake Tekapo, New Zealand) managed to acquire four images of the comet using the 100-cm McLellan reflector and a CCD camera. Lovejoy made an report to the Central Bureau for Astronomical Telegrams and the comet was officially announced on December 2.


                               
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Copyright © 2011 by Terry Lovejoy (Thornlands, Queensland, Australia)
These are the three discovery images acquired by Lovejoy on the morning of 2011 November 27. The comet appears near the center and is very diffuse. It is moving toward the left, being over the top of a star in the middle picture.

Historical Highlights
The first parabolic orbit was calculated by G. V. Williams on 2011 December 2. He took 31 positions from the period spanning 2011 December 1-2 and determined the perihelion date as 2011 December 16.00. The perihelion distance was given as 0.0059 AU. This distance and the angular aspects of the orbit indicated this was a Kreutz sungrazer. The Minor Planet Center released a revised orbit on December 5 that showed only a slight variation in the orbit. The perihelion date was given as 2011 December 15.99, while the perihelion distance was 0.0056 AU. This was based on 40 positions from the period of December 1-4. The first elliptical orbit was published by Williams on December 11. Using 91 positions from the period of November 27 to December 8, Williams calculated a perihelion date of December 16.02, a perihelion distance of 0.0055, and a period of about 377 years. A revision was published by Williams on December 16. This extended the observational arc by two days and determined the perihelion date as December 16.01, the perihelion distance as 0.0056, and the period as about 680 years.
Observations from around the Southern Hemisphere commenced on December 2, although the majority of these were acquired using various camera systems; however, there were still plenty of visual observers following the comet. Lovejoy saw the comet using his 32-cm reflector on December 3. He gave the magnitude as 11.6 and noted a moderately condensed coma 1' across. M. Goiato (Aracatuba, Brazil) saw the comet on December 4. Using his 22-cm reflector, he gave the magnitude as 10.7 and said the coma was 2' across. M. Mattiazzo (Castlemaine, Victoria, Australia) spotted the comet on December 5, using his 28-cm reflector. He estimated the magnitude as 11.2 and noted a moderately condensed coma 1' across.
In the days following the discovery, discussions on several comet blogs turned to the comet's survival probability. Among the very experienced comet observers, the opinion evolved that the comet was too small to survive perihelion and that the real question was would it perish before or during perihelion. This assumption was based on the fact that the comet initially appeared similar to the more than a thousand pygmy sungrazers that had been observed by the SOHO spacecraft during the previous 16 years...none of which survived perihelion. But more than a day prior to perihelion, with the comet starting to dramatically brighten, R. McNaught (Siding Spring Observatory, New South Wales, Australia) suggested this could be a comet that is intermediate between the pygmies and the bright visual sungrazers seen from Earth in the past.
When the comet was closest to the sun, an armada of spacecraft designed to observe the sun and its surrounding, provided movies of the comet's approach and re-emergence. Movie acquired by the Solar Terrestrial Relations Observatory (STEREO)
2011 December 12-14 (during comet approach to Sun)


                               
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Copyright © 2011 by NASA/STEREO/NRL Movie acquired by the Solar Dynamics Observatory (SDO)
2011 December 15-16 (during comet approach to Sun)


                               
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Copyright © 2011 by NASA/SDO Movie acquired by the Solar Terrestrial Relations Observatory (STEREO)
using the EUVI instrument at the 171-angstrom wavelength
2011 December 16 (during comet emergence from behind Sun)


                               
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Copyright © 2011 by NASA/STEREO/NRL
Earliest Post-Perihelion observations from Earth
The very first observation made from Earth following perihelion came from Rick Baldridge and Brian Day (Foothill College Observatory, Los Altos Hills, California) on December 16.83. Using a 41-cm Schmidt-Cassegrain telescope with a nearly 8-cm off-axis mask, Baldridge used the dome shutter to block the sun, focused the telescope on Venus, and then moved the telescope to the comet's predicted position. After a few moments, he saw a "very star-like nucleus with a faint but obvious fan shaped glow streaming away from it. The fan was maybe 20 arc-seconds long. A very rough guess was the nucleus was magnitude -1, based on my impression of the appearance of Mercury years ago at a similar solar elongation." Baldridge called Day, who was parking his car, and Day soon entered the observatory for a look. Upon looking through the telescope and letting his eyes adjust, Day exclaimed, "DAMN! There is is!"
A few hours after the visual sighting, the comet's discoverer, Terry Lovejoy, photographed the comet from his home in Australia on December 17.05. Using the same 20-cm reflector he used to discover the comet and a Canon 350D digital camera, Lovejoy reduced the opening to 5-cm and attached a hood ("to reduce sunlight into the scope") and acquired 14 1/320-second exposures. A comparison with Venus (magnitude -3.9) enabled Lovejoy to estimate the magnitude as -1.2. He added that the coma was about 0.5 arc minutes across, while there was some hint of tail. Lovejoy acquired eight 1/1250-second expsoures with the same equipment on December 17.85 (still daylight). He estimated the magnitude as -0.8. The coma and tail were unchanged from earlier in the day. Image acquired in daylight by T. Lovejoy on 2011 December 17.05

                               
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Copyright © 2011 by Terry Lovejoy (Thornlands, Queensland, Australia)
Another exceptional set of observations was made by Vincent Jacques (Breil-sur-Roya, France). During the period of December 17.38 to 17.54, he said the comet was easily visible in daylight using an 8-cm refractor. In addition, using the same telescope, he acquired several images using an near infrared filter and a DMK21 CCD camera.

                               
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Copyright © 2011 by Vincent Jacques (Breil-sur-Roya, France)

                               
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Copyright © 2011 by Vincent Jacques (Breil-sur-Roya, France) Even More Post-Perihelion observations
Additional visual observations were made as the comet continued to move away from the sun. Alexandre Amorim (Florianopolis, Brazil) spotted the comet using 10x50 binoculars on December 17. He estimated the magnitude as -2.9 and said the coma was very strongly condensed and about 1 arc minute across. He noted the tail extended 0.2 degrees in PA 240. The comet was then 4 degrees above the horizon, while the sun was 0.9 degrees below the horizon. William Souza (Sao Paulo, Brazil) saw the comet on December 18 using 11x80 binoculars. He gave the magnitude as -1.0 and said the coma was 1' across. The tail extended 5' in PA 240 degrees. Noel Munford and Ian Cooper (Sluggish Creek Observatory, Glen Oroua, Manawatu, New Zealand) were seemingly headed for an unsuccessful search for this comet on the morning of December 19, because of clouds over the eastern horizon; however, using 10x50 binoculars, they finally spotted the tail extending 30' to 40' above the cloud tops toward a position angle of 120 degrees. Later the same day, the comet was again seen by Souza. Using his 11x80 binoculars, he gave the magnitude as -0.5 and noted the tail extended 0.3 degrees in PA 240 degrees. Sudden Transformation
Late on December 20 (UT) images began revealing that the comet might be undergoing a dramatic change. J. Cerny released images that had been acquired by the FRAM telescope around December 20.86, which showed the nucleus had apparently become bar-shaped and was accompanied by a bright tail ray, as shown below:

                               
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Copyright © 2011 by Jakob Cerny

Shortly after this image was posted on the comets-ml discussion group, Alan Watson brought attention to a movie that had been put together using images from the STEREO HI1A spacecraft that were taken during December 18 and 19. These seemed to show the head of the comet decreasing in size and a "dust tail wedge...getting longer and broader." This movie is shows below:

                               
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Copyright © 2011 by NASA/STEREO/NRL More Visual Observations
Marco Goiato (Aracatuba, Brazil) saw the comet with 20x100 binoculars on the 20th and gave the magnitude as 1.2. The coma was very strongly condensed. On the 21st, the comet was independently seen by Reginaldo Nazar (Agudos do Sul, Parana, Brazil) and Jose Guilherme de Souza Aguiar (Campinas, Brazil). They gave the magnitude as 2.0 and 2.1, respectively. Nazar noted the coemt was moderately condensed and 10' across, while the tail extended 15 degrees. On the 22nd, Chris Wyatt (Bendemeer, New South Wales, Australia) saw the comet using 7x50 binoculars and said the tail was about 14 degrees long.

                               
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Additional Images

                               
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Copyright © 2011 by Michael Mattiazzo (Castlemaine, Victoria, Australia)
M. Mattiazzo acquired this image on 2011 December 2.65. He used a 28-cm Schmidt-Cassegrain telescope and a Starlight Express MX7c CCD imager. Ten 10-second exposures were stacked, which show the comet as a diffuse trail.


                               
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Copyright © 2011 by John Drummond (New Zealand)

                               
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Copyright © 2011 by Michael Mattiazzo (Castlemaine, Victoria, Australia)
M. Mattiazzo acquired this image on 2011 December 6.72. He used a 28-cm Schmidt-Cassegrain telescope and a Starlight Express MX7c CCD imager. Ten 10-second exposures were stacked, centered on the comet.


                               
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Copyright © 2011 by Jan Ebr, Michael Prouza, Petr Kubanek, and Martin Jelinek (Czech Republic)
This image was acquired during December 10.33-10.34, using the remote 30-cm FRAM telescope, a CCD camera, and an R filter at Malargue, Argentina.


                               
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Copyright © 2011 by ESA/NASA/SOHO
This is a composite of two images acquired by the Solar Heliospheric Observatory (SOHO) on 2011 December 15. The inner, orange portion was obtained by the Large Angle and Spectrometric Coronagraph (LASCO) C2 instrument at 23:00 Universal Time (UT), while the blue image was obtained by the LASCO C3 instrument at 23:06 UT.


                               
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Copyright © 2011 by Jan Ebr, Michael Prouza, Martin Jelinek, and Petr Kubanek (Czech Republic)
This image was acquired during December 18.38, using the remote 30-cm FRAM telescope, a CCD camera, and an R filter at Malargue, Argentina. It is a combination of nine exposures.


                               
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Copyright © 2011 by Vello Tabur (Harden, New South Wales, Australia)
This image was acquired on December 19.7, using a Canon 400D DSLR camera with a 55mm lens, and shows the comet's tail extending from the horizon up into the morning sky. This is a combination of three images totaling 57 seconds. The solar elongation was then 12 degrees and the tail was about 5 degrees long.


                               
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Copyright © 2011 by Marcelo Martins (Agudos do Sul, Parana, Brazil)
This image was acquired on December 21.22, using a Canon 400D DSLR camera with a 50mm lens, and shows the comet's tail extending into the morning sky. This is a 20 second exposure.


                               
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Copyright © 2011 by Rodney Austin (New Plymouth, New Zealand)
This image was acquired on December 21 and shows the comet's tail extending about 18 degrees into the morning sky.
当前Kp指数估计值(三小时平均),当Kp指数达到6或以上时,我国境内有可能观察到极光;当前极光活动水平,极光为9时漠河可能见极光,
预计未来24小时地磁暴最强可达级,当地磁暴级别达到G2或以上时,我国境内有可能见极光
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 楼主| 零度星系 发表于 2011-12-22 12:41 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
CometConstellation
December 1st
December 15th
December 31st
Observations as of (UT)
MagDiamMagDiamMagDiam
C/2011 W3 (Lovejoy)Scorpius0.31'-3.51'3.41.5'2011 December 19
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