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17P彗星意外爆发 亮度接近2等

彗星近况 [2007-11-10]

 

上图:17P彗星“长”出了尾巴(点击放大图片)


历史照片

11月3日拍摄的17P

11月3日17P的位置

  本周初,17P/Holmes彗星让地球上的彗星观测者们着实惊叹了一把。10月24日,在数小时内它的亮度增加了50万倍之多。这次爆发让它从一颗大约7年才绕太阳运行一圈的模糊昏暗彗星成为一颗能与英仙座内较亮恒星媲美,并能用肉眼看到的彗星。这张影像就是在当天拍摄的,地点在伊朗首都德黑兰,影像中突出了城市上空新出现的肉眼可见的彗星。Holmes彗星爆发的原因可能是新形成的彗冰突然爆发,甚至可能是彗核发生分裂。在今后的几天里,这颗彗星还将保持明亮的状态。(文:节选自“每日天文一图”)

  据观测到此彗星的朋友描述,17P起初彗发的凝结程度相当高,现在有所降低,但仍看不到彗尾。不用望远镜,看上去与一颗恒星没有区别。(如下图)


观测资料

轨道根数

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

星历表

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

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.

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


 


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