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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 2011-12-24 12:12 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

                               
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Copyright © 2011 by NASA/Dan Burbank (Expedition 30 commander, International Space Station)
Comet Lovejoy is visible near EarthÂ’s horizon in this image photographed by NASA astronaut Dan Burbank, Expedition 30 commander, onboard the International Space Station on Dec. 21, 2011. Part of the space station is visible at the top of the image.
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 楼主| 零度星系 发表于 2011-12-24 12:13 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

                               
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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.
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 楼主| 零度星系 发表于 2011-12-24 12:16 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

                               
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Copyright © 2011 by Robert McNaught (Siding Spring Observatory, New South Wales, Australia)
Rob obtained this image on December 21.74, as the International Space Station (trail to right of comet's tail) was moving in the same area of the sky. This is a 20-second exposure acquired using a Canon 5D and a 50mm lens.
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 楼主| 零度星系 发表于 2011-12-24 12:22 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

                               
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Copyright © 2011 by Rodney Austin (New Plymouth, New Zealand)
This image was acquired on December 22.63.This was a 30-second exposure using a Canon Kiss DSLR and a 43mm lens.
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 楼主| 零度星系 发表于 2011-12-24 12:30 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

                               
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Copyright © 2011 by Gordon Garradd (Loomberah, New South Wales, Australia)
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 楼主| 零度星系 发表于 2011-12-24 12:31 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

                               
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Copyright © 2011 by Rob Kaufman (Bright, Victoria, Australia)
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 楼主| 零度星系 发表于 2011-12-24 13:35 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
Might I suggest that a few of the more experienced southern comet observers
attempt to ascertain an approximate magnitude for various parts of the comet's
tail. I did this back in 1965 for Ikeya-Seki and it would certainly be
interesting to see just how these measures compare to Lovejoy's.

My points of measurement were roughly at (1) 3-5 degrees behind the coma, (2)
near the mid-point of the tail, (3) about 3 degrees from the visual end of the
tail. Binoculars were used for these observations. In each case comparison stars
of known brightness were expanded through defocusing the binoculars until the
sized of the extrafocal star images matched the tail's width at the given
locations. Also record the width of the tail at the point of measurement. Such
observations will offer some indication of the surface brightness of the tail,
allowing future observers some impression of just how bright the tails of
comets Ikeya-Seki and Lovejoy were to visual observers.

J.Bortle


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 楼主| 零度星系 发表于 2011-12-24 13:36 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
Re: [comets-ml] C/2011 W3 (Lovejoy) from SSO on Dec 23

On 24/12/2011 9:16 AM, Robert McNaught wrote:
>
> My initial impression as the comet was rising was that it was less
> bright than on Dec 21, leaving me a little disappointed. However once
> the full extent of the comet was visible, it continues to be awesome!
> Unlike Vello, I do suspect an overall fading, although it did appear
> to be a bit higher surface brightness than the LMC.
>

Hi Rob,

It's quite possible that the comet has faded somewhat. My comments were
relative to a reference point of two nights ago (Dec 21.7 UT), when
there was still moonlight interference. I didn't see it the following
night due to fatigue (I needed some sleep after racking up nearly 1000
km in the last few days). The view last night (Dec 23.7) finally had the
comet reasonably high in a dark sky. Relative to 2 nights before, it was
significantly easier to see with the naked eye and far more impressive.
To my eye, it had transformed from a ghostly spectre to something of
real substance. Having said that, I agree that the ion tail was less
obvious and less structure was visible in the tail through binoculars.
Overall -- still awesome!

Cheers,
Vello



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 楼主| 零度星系 发表于 2011-12-24 13:41 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

                               
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 楼主| 零度星系 发表于 2011-12-24 13:49 | 显示全部楼层 来自: 中国–四川–攀枝花 电信

                               
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 楼主| 零度星系 发表于 2011-12-24 16:08 | 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


會員謝恩紐西蘭拍攝的 Lovejoy 彗星

DSC_6053s.jpg (73.16 KB)
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 楼主| 零度星系 发表于 2011-12-24 16:09 | 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 彗星在12月19日的光度 -0.5 等,彗尾長約15度。它的光度變化圖如下:

Credit:吉田誠一

                               
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 楼主| 零度星系 发表于 2011-12-24 17:43 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
太阳的X射线(每5分钟更新)

                               
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 楼主| 零度星系 发表于 2011-12-24 17:44 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
本帖最后由 q零度星系 于 2011-12-24 19:04 编辑


                               
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 楼主| 零度星系 发表于 2011-12-24 19:20 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
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 楼主| 零度星系 发表于 2011-12-25 12:25 | 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
位於智利歐洲南方天文台在12月22日拍攝的 Lovejoy 彗星

Credit:G. Blanchard

                               
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点评

太漂亮了 大小麦云都能看到  详情 回复 发表于 2011-12-28 23:32
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 楼主| 零度星系 发表于 2011-12-25 12:27 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
"The ISS passed through the Southern Cross, continued parallel to the Milky Way, and finally arrived at the tail of Lovejoy with its typical golden color," says Caccia. "What a lucky shot!"
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 楼主| 零度星系 发表于 2011-12-25 12:29 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
"The ISS passed through the Southern Cross, continued parallel to the Milky Way, and finally arrived at the tail of Lovejoy with its typical golden color," says Caccia. "What a lucky shot!"
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 楼主| 零度星系 发表于 2011-12-26 13:38 | 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


Lovey 彗日掠日後比較掠日之前的絕對光度增加五等,一個可能的解釋是,掠日前這顆彗星的表面是被一層厚厚的不活躍物質包裹,掠日時經過太陽內日冕的高温及高能粒子將彗星表面這些不佢躍物質侵蝕溶解,露出彗核中心,彗核露出物質受之前掠日時太陽高能粒子影響變成鬆散,掠日後形成目前所見的大彗尾。如果上述的猜想是正確,當彗核大量的鬆散物質被太陽風吹散過後,這顆彗星會迅速轉暗。


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 楼主| 零度星系 发表于 2011-12-26 13:45 | 显示全部楼层 来自: 中国–四川–攀枝花 电信
NASA 發佈12月18日 STEREO SECCHI HI-1A 拍攝的彗星照片。圖中兩個明亮光點,近太陽是水星,較遠和較大是木星。彗星、水星及木星因為明亮,在照片中過份曝光而出現一條垂直的長線。

高清影片 (檔案大小是30MB, wmv 格式)
http://sungrazer.nrl.navy.mil/im ... ovejoy_Dec16_20.wmv
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