17P彗星意外爆发！达到2.8等！！！

今天下午3点的新鲜货上架

今天天气很好

阴天，我看不见！55555。。。。

Yoshida的观测情况：
2007 Oct. 24 (1 comet)
13:14 UT
I confirmed the unbelievable super outburst of 17P/Holmes beside Tsurumi River in Yokohama City, Kanagawa, Japan! It is visible with naked eyes in a large city!

15:12 UT
17P/Holmes is brightening furthermore within two hours. It is about to be a 2-mag object soon!
It looks completely stellar. It looks evidently yellow, very different from a whilte color star delta Per. It seems strange that the comet is yellow, which causes as if it were a nova, not a comet.

17:08 UT
17P/Holmes got brighter furthermore! Perseus does not look "Perseus" familiar to us due to the bright stellar object now.

19:13 UT
17P/Holmes seems to have reached to the maximum. It kept the same brightness during last two hours. The rapid brightening seems to have stopped.

17P/Holmes
13:14 UT   3.7 mag   DC 9   (10x66 monocular 10x)

13:17 UT   3.5 mag   DC 9   (naked eye)

15:12 UT   3.2 mag   DC 9   (10x66 monocular 10x)

15:14 UT   3.0 mag   DC 9   (naked eye)

17:08 UT   2.9 mag   DC 9   (10x66 monocular 10x)

17:10 UT   2.8 mag   DC 9   (naked eye)

19:13 UT   2.9 mag   DC 9   (10x66 monocular 10x)

19:15 UT   2.8 mag   DC 9   (naked eye)


2007 Oct. 27 (1 comet)


I observed 17P/Holmes on Oct. 27 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

Typhoon has gone, and we could suddenly have a fine night as the weather forecast said. The sky is clear and stars are visible well, despite the full moon. I could finally see Comet 17P/Holmes since the outburst night.

17P/Holmes
2.7 mag   Dia. 3.5'   DC D2   (10x66 monocular 10x)

2.5 mag   DC 9   (naked eye)

Comet 17P/Holmes still looks almost stellar with naked eyes. It is rather orange now. It got evidently brighter than Oct. 24. I could find the comet itself before recognizing the Perseus constellation.

Using a 10x66 monocular, I immediately found a strange round ball-like object, like a planetary nebula or an out-of-focus star. Now it is not sharp at all, although it was completely stellar and strongly sharp on Oct. 24. The color is similar to Jupiter or Saturn. But the rim of the comet is much more blurred than those planets. So it does not look like a planet.

2007 Oct. 28 (1 comet)



I observed 17P/Holmes on Oct. 28 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

It was fine with no clouds all through the daytime today. The weather forecast says it will be cloudy, then rainy, tonight. Thin clouds came over the sky in the evening. But now clouds have gone, and the weather is fine.

17P/Holmes
2.4 mag   Dia. 5'   DC 6   (10x66 monocular 10x)

2.4 mag   DC 9   (naked eye)

Comet 17P/Holmes looked flat last night, but it looks more cometary tonight. A tiny dense spot is visible at the center, surrounded with a circle coma. Now it is getting large, so the total magnitude seems to be getting slightly brighter.

It still looks stellar with naked eyes.

The outburst is OVER


Dear All,

I've been observing this comet since 25.5 Oct at mm-wavelengths with the 12-m
telescope at Kitt Peak, with help of L.Paganini. Between 25.5 Oct and now the
HCN intensity dropped down by nearly 10 times. I suppose that what we are
observing right now are only some leftovers from the outburst which haven't
photodissociated and haven't left our beam yet...

In contrast, even if the nucleus activity is over, the dust cloud will be
probably visible for a long time. We measure gas expansion velocity of 0.35
km/s, so dust should be much slower, and surely size-dependent.

BTW, don't expect spectacular tail. There is only very little CO in this
comet, so no strong source of CO+ tail... The only chance is a dust tail.

Clear Skies!
Michal

PS. This observations wouldn't be possible if not immediately granting me the
observing time by the ARO director, for which I'm very gratefull.



彗星爆发结束了？
通过凯克12米望远镜从彗星爆发后25日开始观测，到现在，17P的活跃度下降，而且一氧化碳分子较少，也别指望能观测到很明显的气体彗尾，最多是不很显眼的尘埃尾。

[ 本帖最后由 suhuasky 于 2007-10-28 20:26 编辑 ]

看到了  不错哦～   

终于看到了！北京雨后天晴天气很好！

好不容易天津天晴，刚才上房顶子，就能看见了。

具体请看http://www.astronomy.com.cn/bbs/thread-81359-1-1.html

不过我是独立发现的,哈哈,我事先不知道有17p,因为今天天气好,所以在阳台上看英仙座Mirphak那一群小星星,用我的7*50看到左下有一模糊的圆面状东东,我还以为是星星透过云层产生的光晕,可是又觉得不像.用30厘米dob看光晕中心有颗亮点,亮度在4等左右.搞不懂怎么回事,所以到论坛上看看,没想到不是UFO,是彗星啊.观测地点:北京西四环偏南,路灯,霓虹灯都有,光害严重.

原帖由 ksana 于 2007-10-28 21:52 发表

                               
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不过我是独立发现的,哈哈,我事先不知道有17p,因为今天天气好,所以在阳台上看英仙座Mirphak那一群小星星,用我的7*50看到左下有一模糊的圆面状东东,我还以为是星星透过云层产生的光晕,可是又觉得不像.用30厘米dob看光 ...

不错不错
迟1百多年独立发现
说不定哪天真的最先发现一颗新彗星

原帖由 qwertyuiop515 于 2007-10-28 17:28 发表

                               
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阴天，我看不见！55555。。。。

我也和你一样，一直无法看到它。 但我没“55555”……

雖然看到了  但是 看不到尾巴  

是否因為要離開太陽所以 不會有尾巴 ??

我同意小龙的看法，学过机械制图的就不难理解了

原帖由 ssry 于 2007-10-29 12:16 发表

                               
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我同意小龙的看法，学过机械制图的就不难理解了

小龙和你的看法我懂，就是视角问题
不过并不适用于17P，因为从目前彗星的角度来看，如果彗星有明显彗尾，从地面是可以观测到的，不能看到彗尾是不能完全用视角来解释。
从凯克12米望远镜的观测数据来看，没有彗尾的主要原因是彗星爆发喷射物主要是尘埃，扩散不充分，主要是均匀扩散形成球状，CO较少，无法形成壮观的离子尾，视角只是一个方面，唯一能用视角解释的是，彗尾大致在彗星背后，较短的尾也许被彗发挡住，无法观测到，但也说明即使有尾，也非常短。

引用: suhuasky 在文中说道:


QUOTE:
原帖由 ssry 于 2007-10-29 12:16 发表
我同意小龙的看法，学过机械制图的就不难理解了
小龙和你的看法我懂，就是视角问题
不过并不适用于17P，因...

取决于你怎么定义彗尾…… 事实上我们都观测到了彗尾。CBET 1111才公布了几个鬼子测定彗尾的eruption speed
如果你硬说离开彗头的尘埃不是彗尾，那我也没办法了……

引用: suhuasky 在文中说道:


QUOTE:
原帖由 ssry 于 2007-10-29 12:16 发表
我同意小龙的看法，学过机械制图的就不难理解了
小龙和你的看法我懂，就是视角问题
不过并不适用于17P，因...

从LS的处理结果来看扩散还是很充分的，和个大火山一样……

28日彗星照片
彗发中好多星啊

COMET 17P/Holmes
     Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2007
Oct. 29.08, 2.1, -- (B. G. Marsden, Lexington, MA, U.S.A., naked eye);
     28.82, 2.4, 4' (T. Scarmato, Calabria, Italy, naked eye; moonlight);
     28.79, 2.8, -- (J. Carvajal, Madrid, Spain, naked eye);
     28.75, 2.5, 8' (S. Baroni, Milan, Italy, 7x50 binoculars);
     28.71, 2.8, -- (A. Giambersio, Potenza, Italy, naked eye);
     28.67, 2.5, 7' (Y. Nagai, Gunma, Japan, 7x35 binoculars; moonlight);
     28.46, 2.4, -- (S. Yoshida, Kanagawa, Japan, naked eye);
     28.24, 2.5*, -- (L. A. Mansilla, Rosario, Argentina, naked eye; alt. 5 deg; nearly full moon 24 deg away);
     28.20, 2.3, -- (F. Rodriguez, Sevilla, Spain, naked eye; moonlight);
     28.15, 2.6, -- (A. Amorim, Florianopolis, Brazil, naked eye; moonlight and light pollution; comet alt. 11 deg);
     28.15, 2.5, -- (D. W. E. Green, Lexington, MA, U.S.A., naked eye; nearly full moon some 25 deg away);
     28.13, 2.1, -- (J. G. de S. Aguiar, Campinas, Brasil, naked eye);
     28.10, 2.5, -- (J. Rao, Putnam Valley, NY, U.S.A., naked eye);
     28.07, 2.5, -- (A. Pereira, Carnaxide, Portugal, naked eye);
     27.87, 2.5, -- (J.-C. Merlin, Le Creusot, France, naked eye);
     27.85, 2.4, 4' (J. J. Gonzalez, Leon, Spain, naked eye; moonlight);
     27.82, 2.5, -- (J. Carvajal, Madrid, Spain, naked eye);
     27.81, 2.8, 11' (J. J. Gonzalez, Leon, Spain, 25x100 binoculars; moonlight);
     27.79, 2.1, 3' (T. Scarmato, Calabria, Italy, naked eye; moonlight);
     27.75, 2.5, -- (R. Haver, Roma, Italy, naked eye; yellowish color);
     27.74, 2.1, -- (S. Foglia, Novara, Italy, naked eye);
     27.71, 2.6, -- (K. Cernis, Vilnius, Lithuania, naked eye);
     27.63, 2.4, -- (Y. Nagai, Gunma, Japan, naked eye; stellar appearance);
     27.29, 2.8, -- (C. W. Hergenrother, Tucson, AZ, U.S.A., naked eye; stellar appearance);
     27.17, 2.3, -- (F. Rodriguez, Sevilla, Spain, naked eye; moonlight);
     27.16, 2.2, -- (W. Souza, Sao Paulo, Brazil, naked eye; moonlight);
     27.16, 2.4, 4' (J. J. Gonzalez, Leon, Spain, naked eye; moonlight);
     27.16, 2.2, -- (W. Souza, Sao Paulo, Brazil, naked eye; full moon);
     27.12, 2.3, 6' (A. Amorim, Florianopolis, Brazil, 20x80 binoculars; moonlight and light pollution);
     27.07, 2.5, -- (A. Pereira, Carnaxide, Portugal, naked eye);
     26.90, 2.4, -- (J. Carvajal, Madrid, Spain, naked eye);
     26.87, 2.4, -- (F. Rodriguez, Sevilla, Spain, naked eye; moonlight);
     26.86, 1.9, -- (T. Scarmato, Calabria, Italy, naked eye);
     26.85, 2.4, -- (K. Yoshimoto, Yamaguchi, Japan, naked eye);
     26.84, 2.4, 2'.5 (W. Xu, Guangzhou, China, 0.10-m refractor; strong moonlight and city light pollution; clouds; extremely hazy sky);
     26.81, 2.4, -- (M. Tichy, Klet Observatory, Czech Republic, naked eye; full moon);
     26.80, 2.5, 1' (S. E. Shurpakov, Baran, Belarus, naked eye);
     26.67, 2.2, -- (K. Cernis, Vilnius, Lithuania, naked eye);
     26.22, 2.6, -- (D. W. E. Green, Lexington, MA, U.S.A., naked eye; full moon 30 deg away);
     26.19, 2.7, -- (C. W. Hergenrother, Tucson, Arizona, naked eye; stellar appearance);
     26.12, 2.6, -- (B. G. Marsden, Lexington, MA, U.S.A., naked eye);
     26.07, 2.6, -- (A. Pereira, Carnaxide, Portugal, naked eye);
     26.05, 2.2, 3' (P. Creed, North Canton, OH, U.S.A., naked eye);
     25.92, 2.4, 2' (D. Rodriguez, Madrid, Spain, 10x50 binoculars);
     25.84, 2.3, -- (J. Carvajal, Madrid, Spain, naked eye);
     25.81, 2.7, 1'.7 (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; moonlight);
     25.77, 2.5, 1'.5 (V. Nevski, Vitebsk, Belarus, naked eye);
     25.75, 2.4, 0'.7 (O. Skilbrei, Sollihogda, Norway, 7x50 binoculars; yellowish color);
     25.75, 2.6, 2' (B. H. Granslo, Tryvann, Oslo, Norway, 10x50 binoculars);
     25.68, 2.9, 8' (S. E. Shurpakov, Baran, Belarus, 8.0-cm refractor + CCD);
     25.60, 2.4, -- (K. Yoshimoto, Yamaguchi, Japan, naked eye);
     25.6, 3.2, -- (Q. Ye, Xiaoguwei Island, Guangzhou, China, 7x50 binoculars; light pollution, strong moonlight);
     25.48, 2.6, -- (B. King, Duluth, MN, U.S.A., naked eye);
     25.35, 2.2, +60" (J. McGaha, Tucson, AZ, U.S.A., 0.62-m reflector + R_c filter + CCD; outer coma dia. 79", inner coma dia. 14");
     25.33, 2.7, -- (M. Linnolt, Honolulu, HI, U.S.A., naked eye; bright moonlight);
     25.29, 2.8, -- (C. W. Hergenrother, Tucson, AZ, U.S.A., naked eye; stellar appearance);
     25.21, 2.9, -- (D. Fernandez, Viladevacalls, near Barcelona, Spain, naked eye);
     25.17, 2.5, 4' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars; moonlight);
     25.15, 2.6, -- (P. Creed, Canton, OH, U.S.A., naked eye; cirrus clouds);
     25.08, 2.4, -- (J. J. Gonzalez, Leon, Spain, naked eye; stellar appearance; moonlight);
     25.06, 2.6, -- (V. Nevski, Vitebsk, Belarus, naked eye; stellar appearance);
     25.04, 2.6, -- (B. King, Duluth, MN, U.S.A., naked eye);
     24.93, 2.7, -- (H. Dahle, Marseille, France, naked eye; stellar appearance);
     24.90, 2.6, -- (R. Haver, Roma, Italy, 10x50 binoculars; stellar appearance, orange color);
     24.89, 2.7, & 0'.5 (B. H. Granslo, Tryvann, Oslo, Norway, 10x50 binoculars; small yellowish disk);
     24.89, 2.5, -- (T. Scarmato, Calabria, Italy, naked eye);
     24.87, 2.4, -- (T. Scarmato, Calabria, Italy, naked eye);
     24.84, 2.7, -- (K. Ohtsuka, Tokyo, Japan, naked eye; stellar appearance);
     24.83, 2.6, -- (T. Scarmato, Calabria, Italy, naked eye);
     24.82, 2.7, -- (K. Ohtsuka, Tokyo, Japan, naked eye; stellar appearance);
     24.82, 2.8, -- (D. Buczynski, Conder Brow, England, from images taken by D. Buczynski, 0.33-m reflector + CCD);
     24.81, 2.8, -- (K. Yoshimoto, Yamaguchi, Japan, naked eye);
     24.80, 2.7, -- (A. Giambersio, Potenza. Italy, naked eye);
     24.80, 2.8, -- (S. Yoshida, Kanagawa, Japan, naked eye; stellar appearance);
     24.80, 2.7, -- (R. Haver, Roma, Italy, naked eye and 10x50 binoculars; stellar appearance, orange color);
     24.80, 2.7, -- (J. J. Gonzalez, Leon, Spain, naked eye; stellar appearance; coma diameter 0'.5 in 25x100 binoculars; moonlight);
     24.79, 2.7, -- (V. Nevski, Vitebsk, Belarus, naked eye; stellar appearance);
     24.77, 2.6, -- (K. Ohtsuka, Tokyo, Japan, naked eye; stellar appearance);
     24.72, 2.8, -- (S. Yoshida, Kanagawa, Japan, naked eye; stellar appearance);
     24.72, 2.8, -- (K. Ohtsuka, Tokyo, Japan, naked eye; stellar appearance);
     24.68, 3.0, -- (S. E. Shurpakov, Baran, Belarus, naked eye);
     24.63, 3.0, -- (S. Yoshida, Kanagawa, Japan, naked eye; stellar appearance);
     24.61, 3.6, 1'.7 (K. Kadota, Ageo, Saitama-ken, Japan, 0.25-m reflector + CCD; no tail);
     24.55, 3.5, -- (S. Yoshida, Kanagawa, Japan, naked eye; stellar appearance);
     24.50, 4.0, -- (A. Hale, Cloudcroft, NM, naked eye; stellar appearance);
     24.34, 4.6:, -- (E. Guido and G. Sostero, remotely with a 0.25-m reflector + CCD near Mayhill, NM; stellar appearance);
     24.21, 7.4, -- (F. Kugel, Dauban, France, 0.5-m reflector + CCD; stellar appearance; outburst!);
     21.60, 16.5, -- (K. Kadota, Ageo, Saitama-ken, Japan, 0.25-m reflector + CCD);
      6.67, [14.1, ! 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
      5.74, [14.1, ! 0'.4 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
Aug. 25.07, 16.4, +0'.3 (A. Baransky, Lisnyky, Ukraine, 0.70-m reflector + CCD);
July 25.12, 14.7, 0'.4 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
     14.09, [14.5, ! 0'.5 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);