17P彗星意外爆发！达到2.8等！！！

据水木社区的dreammh说，20号意大利Schiaparelli天文台60cm专业望远镜的观测这个彗星还是17.8等，而25日凌晨1点半，日本观测彗星已经达到2.8等!

彗星在英仙座，详细的看这帖：
http://www.newsmth.net/bbstcon.php?board=Astronomy&gid=93162


意大利人拍的BVR波段合成图和一些简单图象处理（25cm望远镜）：

                               
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[ 本帖最后由 活动星图 于 2007-10-25 07:30 编辑 ]

昨天中午起收到报告，现在彗星在英仙座，几乎整晚也在北方天空，愈加接近α星中，什么也不说了，晚上就动身去看了！
星历表

cfa-www.harvard.edu/iau/Ephemerides/Comets/0017P.html

《S&F新闻》
www.skyandtelescope.com/observing/home/10775326.html

17P/Holmes
Orbital Elements
The following orbital elements are taken from MPC 51822:
17P/Holmes
Epoch 2007 May 20.0 TT = JDT 2454240.5
T 2007 May 4.4995 TT                                    MPC
q   2.053169             (2000.0)            P               Q
n   0.1432508      Peri.   24.2585      +0.9756506      +0.1267918
a   3.617468       Node   326.8675      -0.2124462      +0.7491399
e   0.432429       Incl.   19.1132      +0.0545208      +0.6501640
P   6.88
From 139 observations 1964-2001, mean residual 0".7.  Nongravitational
     parameters A1 = +0.19, A2 = +0.0287.

Elements are also available for the current standard epoch:
17P/Holmes
Epoch 2007 Oct. 27.0 TT = JDT 2454400.5
T 2007 May 4.5277 TT                                    MPC
q   2.053218             (2000.0)            P               Q
n   0.1431946      Peri.   24.2712      +0.9756707      +0.1266254
a   3.618414       Node   326.8646      -0.2123230      +0.7491869
e   0.432564       Incl.   19.1126      +0.0546417      +0.6501423
P   6.88

[ 本帖最后由 活动星图 于 2007-10-25 07:36 编辑 ]

WARNING!
This comet gets close to the sun during the period covered
in the ephemeris below.  Observers are warned to be wary
of observing comets near the sun.  NEVER point any kind of
optical instrument at the sun--instant blindness will be
the probable result.

以上大多没用。。。下边才是好东西。。。


Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2

2007 09 27    04 01.48   +46 22.6    1.756    2.337   113.0    23.3  16.8  20.2
2007 10 02    04 02.37   +47 14.2    1.728    2.355   116.8    22.3  16.8  20.1
2007 10 07    04 02.22   +48 01.8    1.702    2.373   120.7    21.2  16.8  20.1
2007 10 12    04 01.00   +48 44.8    1.678    2.391   124.6    20.1  16.8  20.0
2007 10 17    03 58.71   +49 22.2    1.659    2.410   128.6    18.9  16.8  20.0
2007 10 22    03 55.40   +49 53.1    1.642    2.428   132.5    17.6  16.9  19.9
2007 10 27    03 51.17   +50 16.6    1.630    2.447   136.3    16.3  16.9  19.9
2007 11 01    03 46.14   +50 31.9    1.623    2.467   139.9    15.0  16.9  19.8
2007 11 06    03 40.50   +50 38.3    1.620    2.486   143.2    13.8  17.0  19.8
2007 11 11    03 34.47   +50 35.4    1.623    2.506   146.0    12.8  17.0  19.8
2007 11 16    03 28.31   +50 23.1    1.631    2.526   148.2    11.9  17.1  19.8
2007 11 21    03 22.27   +50 02.1    1.646    2.546   149.4    11.4  17.2  19.8
2007 11 26    03 16.60   +49 33.0    1.666    2.567   149.7    11.2  17.2  19.8
2007 12 01    03 11.49   +48 57.0    1.692    2.587   149.0    11.3  17.3  19.9
2007 12 06    03 07.09   +48 15.5    1.724    2.608   147.3    11.8  17.4  20.0
2007 12 11    03 03.53   +47 29.9    1.761    2.628   144.8    12.5  17.5  20.1
2007 12 16    03 00.88   +46 41.7    1.805    2.649   141.8    13.3  17.6  20.2
2007 12 21    02 59.17   +45 52.3    1.854    2.670   138.4    14.2  17.7  20.3
2007 12 26    02 58.38   +45 02.9    1.908    2.692   134.6    15.1  17.9  20.4
2007 12 31    02 58.47   +44 14.5    1.967    2.713   130.7    15.9  18.0  20.5
2008 01 05    02 59.41   +43 28.0    2.030    2.734   126.7    16.8  18.1  20.6
2008 01 10    03 01.13   +42 43.8    2.097    2.755   122.7    17.5  18.2  20.7
2008 01 15    03 03.59   +42 02.5    2.168    2.777   118.6    18.1  18.3  20.8
2008 01 20    03 06.71   +41 24.3    2.242    2.798   114.6    18.6  18.5  20.9
2008 01 25    03 10.44   +40 49.2    2.319    2.820   110.6    19.1  18.6  21.0
2008 01 30    03 14.71   +40 17.3    2.399    2.842   106.6    19.4  18.7  21.1
2008 02 04    03 19.47   +39 48.4    2.480    2.863   102.7    19.6  18.8  21.2

[ 本帖最后由 活动星图 于 2007-10-25 07:51 编辑 ]

2.8等,唉不知道我这能不能看到,这几天天气不错,但城市光污染太严重,只能看到一等的星星.

好消息！晚上天去好的话就去看。

关注！
不过这大月亮的确实不好办

今天我这里的天气刚刚变坏！！昨晚还是凑合的。预报看周五会转好！期望到时彗星还有这样的亮度。17P挺住啊

我这下雨了

會維持多少天 ?  還有為何突然變亮  
增加 太快了吧 ..

希望公司周六放假吧，同时也希望17P维持亮度吧。
我总是希望~~~

从彗星的距离看，应该是分裂或被撞，而且亮度爆发不会持续很久

来不及观测了，没有时间上山……

17P/Holmes
2007 Oct. 24.55 UT: m1=3.7, Dia.=-, DC=9... 10x66R (10x) ...Seiichi Yoshida
(Kanagawa, Japan)
2007 Oct. 24.55 UT: m1=3.5, Dia.=-, DC=9... NE ...Seiichi Yoshida (Kanagawa,
Japan)

Hello all!
I also observed the comet this morning after the alert of Ramon Naves,
On my images taken at 05:16 am (TU), I measured the comet of stellar
aspect at magnitude 7,4.
Very impressive!

a first image exp= 9x5s unfiltered T500F/3)
here :

                               
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<

                               
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>

Francois Kugel
#A77 Observatoire Chante-Perdrix - Dauban (France)

Hello,
After hearing of Ramon Naves' observation last night on comet-images,
I looked at 17P/Holmes with a 25cm reflector at 76x and 214x on Oct.
24, 4:10 UT. The comet was a mag. 7.1 "star" with a yellow hue. This
morning (Oct. 24, 11:15UT), the moon was out of the sky and seeing was
excellent. To my amazement, 17P had brightened to naked eye visibility
being nearly equal to 48 Per at visual mag. 4.0. In the same
telescope, the coma showed an intense, nearly stellar false nucleus
about 2.5"-3" across set in a small, 10" diameter, much fainter,fuzzy
disklike coma. The nucleus was distinctly yellow. The comet's
appearance was very reminiscent of McNaught last winter when seen in
the daytime sky. What a sight!
Bob King
Duluth, Minn., USA

A very exciting night for comet observers everywhere. Here is my
observation made just a few minutes ago on Oct 25, 1 UT. Naked eye
comparison with Delta and Alpha Persei gives magnitude 2.6. In the
25cm reflector at 76x, the disklike coma measures about 45" with DC=9.
Both coma and false nucleus are tinted yellow. The coma, which has a
crisp, distinct border, is slightly elongated in a north-south
direction. The false nucleus is nearly stellar at 214x and slightly
south of the coma's center. A broad, dense fan extends some 5-7" from
the nucleus from PA 240 to 360. This comet is starting to develop some
fascinating characteristics. It looks like a butter cookie :-)
Clear skies to all,
Bob King
Duluth, Minn. USA

立即准备观测~~!!!!!!!