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）：
http://www.fototime.com/{369D45AF-4AAF-49F7-AAE5-5872B0BDDE0C}/picture.JPG
[ 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
轨道根数
17P/HolmesOrbital 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 ]
星历表
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 23.316.820.2
2007 10 02 04 02.37 +47 14.2 1.728 2.355 116.8 22.316.820.1
2007 10 07 04 02.22 +48 01.8 1.702 2.373 120.7 21.216.820.1
2007 10 12 04 01.00 +48 44.8 1.678 2.391 124.6 20.116.820.0
2007 10 17 03 58.71 +49 22.2 1.659 2.410 128.6 18.916.820.0
2007 10 22 03 55.40 +49 53.1 1.642 2.428 132.5 17.616.919.9
2007 10 27 03 51.17 +50 16.6 1.630 2.447 136.3 16.316.919.9
2007 11 01 03 46.14 +50 31.9 1.623 2.467 139.9 15.016.919.8
2007 11 06 03 40.50 +50 38.3 1.620 2.486 143.2 13.817.019.8
2007 11 11 03 34.47 +50 35.4 1.623 2.506 146.0 12.817.019.8
2007 11 16 03 28.31 +50 23.1 1.631 2.526 148.2 11.917.119.8
2007 11 21 03 22.27 +50 02.1 1.646 2.546 149.4 11.417.219.8
2007 11 26 03 16.60 +49 33.0 1.666 2.567 149.7 11.217.219.8
2007 12 01 03 11.49 +48 57.0 1.692 2.587 149.0 11.317.319.9
2007 12 06 03 07.09 +48 15.5 1.724 2.608 147.3 11.817.420.0
2007 12 11 03 03.53 +47 29.9 1.761 2.628 144.8 12.517.520.1
2007 12 16 03 00.88 +46 41.7 1.805 2.649 141.8 13.317.620.2
2007 12 21 02 59.17 +45 52.3 1.854 2.670 138.4 14.217.720.3
2007 12 26 02 58.38 +45 02.9 1.908 2.692 134.6 15.117.920.4
2007 12 31 02 58.47 +44 14.5 1.967 2.713 130.7 15.918.020.5
2008 01 05 02 59.41 +43 28.0 2.030 2.734 126.7 16.818.120.6
2008 01 10 03 01.13 +42 43.8 2.097 2.755 122.7 17.518.220.7
2008 01 15 03 03.59 +42 02.5 2.168 2.777 118.6 18.118.320.8
2008 01 20 03 06.71 +41 24.3 2.242 2.798 114.6 18.618.520.9
2008 01 25 03 10.44 +40 49.2 2.319 2.820 110.6 19.118.621.0
2008 01 30 03 14.71 +40 17.3 2.399 2.842 106.6 19.418.721.1
2008 02 04 03 19.47 +39 48.4 2.480 2.863 102.7 19.618.821.2
[ 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.::070821_07.jpg:: 好消息！晚上天去好的话就去看。::070821_13.jpg:: 关注！
不过这大月亮的确实不好办yct56.gif 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~~~::070821_13.jpg:: 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……::070821_20.jpg:: 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 :
http://perso.orange.fr/fkometes/images/comets_img/17P-07102422-9x5sz05.JPG
<http://perso.orange.fr/fkometes/images/comets_img/17P-07102422-9x5sz05.JPG>
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~~!!!!!!!::070821_09.jpg:: ::070821_09.jpg::