日本彗星专家Seiichi Yoshida 网站关于17的资料：
Surprisingly, a great outburst occured on Oct. 24 and now it becomes so bright as 2.5 mag, visible with naked eyes! Almost stellar, so it looks like a nova. It was observed as 14.5 mag in July, then it had been fading down to 17 mag until mid October as predicted. This comet was also in great outburst at the discovery in 1892 and became so bright as 5 mag. At that time, the comet faded after the first outburst, but soon brightened again in the second outburst. The further brightness is uncertain. But the comet will be observable in excellent condition for a while after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Oct. 20 3 56.82 49 41.6 1.648 2.421 130 16.0 2:06 (180, 75) Oct. 27 3 51.15 50 16.7 1.630 2.447 136 2.5 1:33 (180, 75) The following orbital elements are taken from MPC 51822: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. m1 = 1.5 + 5 log d + 35 log r [ ,172.5] ( - 2007 Oct. 24)
m1 = -18 + 5 log d + 50 log r [172.5, ] (2007 Oct. 24 - ) * Gray curve is: m1 = 1.5 + 5 log d + 35 log r
[ 本帖最后由 suhuasky 于 2007-10-26 22:17 编辑 ] |
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