9月10号晚上,我发现了一颗非同寻常的SOHO彗星!

注意：有一颗Kracht II族彗星（C/1999 R1），马上就要回归了，在SOHO的C3图上可见！
这里，有一张这颗彗星在最近几天的SOHO C3图片上的轨道示意图：

                               
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[ 本帖最后由 周波 于 2007-9-19 01:01 编辑 ]

Transits of Objects through the LASCO/C3 FOV in 2007
The following list was compiled by Sebastian F. Hoenig. www.sungrazer.org
All dates and magnitudes are approximate.


Dec 24 - Jan 19 Mercury -1.2mag Right to Left
Jan 11 - Jan 15 C/2006 P1 5.5mag? Top Left to Bottom Left
Feb 01 - Feb 16 Neptune 8.0mag Left to Right
Feb 19 - Feb 26 Mercury 3.0mag Left to Right
Feb 25 - Mar 13 Uranus 5.9mag Left to Right
Apr 01 - Apr 06 96P/Machholz 8.8mag Bottom Left to Top Left
Apr 26 - May 09 Mercury -2.3mag Right to Left
Apr 26 - Apr 30 2P/Encke 6.2mag Bottom Left to Bottom Right
Jun 23 - Jul 03 Mercury 4.1mag Left to Right
Aug 08 - Aug 24 Mercury -1.7mag Right to Left
Aug 12 - Aug 31 Saturn 0.6mag Left to Right
Aug 16 - Aug 19 Venus -4.0mag Left to Right
Sep 10 - Sep 12 C/1999 R1 (SOHO) 6.0mag Mid-Bottom to Bottom Right
Oct 20 - Oct 27 Mercury 3.0mag Left to Right
Dec 02 - Dec 31 Mercury -1.2mag Right to Left
Dec 12 - Jan 02 Jupiter -1.8mag Left to Right


Points of interest
Four comets (hopefully) visible this year:

C/2006 P1 (McNaught): exact brightness still uncertain (mid-January)
96P/Machholz: unfavourable apparition
2P/Encke
C/1999 R1 = C/2002 R5 (SOHO): Predicted 3rd perihelion passage

***********************
注意看这个：
Sep 10 - Sep 12 C/1999 R1 (SOHO) 6.0mag Mid-Bottom to Bottom Right
---------------------------------------
C/1999 R1 = C/2002 R5 (SOHO): Predicted 3rd perihelion passage

LASCO C/2003 R5 (Kracht II) Group Comets

--------------------------------------------------------------------------------
The column labelled V/A denotes whether the comet was found in a Visual search of the data or by the Automated search.
Note: The radius of the sun is 0.00465 AU
NOTE ALSO: IAUC's are only available to subscribers of the CBAT's Electronic Computer Services.

DATE NAME DISCOVERER TELESCOPE q IAUC V/A

1999 Sep 5.52 C/1999 R1 SOHO-085 T. Lovejoy C2, C3 0.0565 7251 V

2002 Sep 5.79 C/2002 R5 SOHO-513 R. Matson C2, C3 0.0472 7984 V

2003 Sep 8.81 C/2003 R5 SOHO-661 K. Cernis C2, C3 0.0569 8340 V

Note: These comets are clearly related, and so are tentatively regarded as a separate comet group.

[ 本帖最后由 周波 于 2007-9-13 02:40 编辑 ]

Some last information on the 3rd perihelion passage of 1999 R1 = 2003 R5

*****************
Dear all,

here is some updated information on the coming third perihelion passage of 1999
R1. According to the prediction in the A&A paper, the time of perihelion is
expected for Sep 11, see information at http://tinyurl.com/2a42um .

Yesterday, Rainer Kracht reminded me that there is some difference if one takes
the orbit with only C2 positions and the elements from combined C2+C3
astrometry. Actually, when integrating the former orbit, you end up with a
perihelion time at Sep 26, while the latter results in Sep 11. So, which one is
correct?

Answer: We will see... The preference for Sep 11 comes from the assumption
that the object is stable in the 3:1 resonance with Jupiter. Thus, the
semi-major axis and periodicity shouldn't change too much from one perihelion
passage to the next. In addition, I think that the negative effects that
introduced by using the C3 astrometry (which is worse than C2) is compensated by
the longer arc.

The bottom line of all this technical stuff is: You will probably see the comet
around Sep 11, but don't be too surprised if it takes another 2 weeks.

Recently, I published a re-analysis of the available photometry on comets-ml.
The updated numbers are H=22.1 and n=5.1 (K=12.8). So, if you use some
planetarium software, use these values to estimate the brightness.

Cheers,
Sebastian

On September 11, 2007 comet P/1999 R1 will make its third known perihelion passage in history.



The comet was found at the first perihelion passage in 1999 by Australian amateur astronomer Terry Lovejoy in LASCO C3 images which were published on the SOHO website. It passed through the C3 field between September 5 and 6, reaching a peak magnitude of 6.2 mag. It was highly condensed and didn‘t show any tail.



On September 5, 2003, Kazimieras Cernis (Lithuania) found a comet C3 website images which showed very similar apparent motion and brightness as 1999 R1. Rainer Kracht (Germany) initially suggested that 1999 R1 and 2003 R5, together with another comet 2002 R5, form the core of a new comet group. There was, however, no further member of this tentative group found in archival or realtime data.



In 2005, I showed that the observations of 1999 R1 and 2003 R5 can be represented by the same orbital elements. A link between both apparitions was successfully realised. Resulting orbital elements are published in Table 2 of Hönig (2006). Click to enlarge:

……
-----------------
Comet P/1999 R1 Trivia:



· It is the short period object with the smallest known perihelion distance in the solar system (0.057 AU)



· There is only one other comet which has a shorter orbital period than the 4.0 years of P/1999 R1.
2P/Encke has a 3.3 year periodicity.



· P/1999 R1 has elements which fall into the 3:1 resonance with Jupiter. This famous gap in the main asteroid belt is weakly populated by a very rare class of minor planets (Alindas).



· There is the suggestion that SOHO comet 2002 R5 is a small fragment of 1999 R1. Assuming a similar orbital period as for the parent body, a prediction for a possible return in August/September 2006 was made. Nothing was observed, but the possible return fell in a time with huge data gaps which were caused by SOHO maneuvers. A next return might occur in July-October 2010.

**************************
http://www.mpifr-bonn.mpg.de/sta ... Dateien/Page434.htm

引用: 周波 在文中说道:
Dec 24 - Jan 19 Mercury -1.2mag Right to Left
Jan 11 - Jan 15 C/2006 P1 5.5mag? Top Left to Bottom Left
Feb 01 - Feb 16 Neptune 8.0mag Left to Right
Feb 19 - Feb 26 Mercury 3.0mag Left to Right
Feb 25 - Mar 13 Uranus 5.9mag Left to Right
Apr 01 - Apr 06 96P/Machholz 8.8mag Bottom Left to Top Left

这些left to right 是什么意思？

以上，那些英文的相关资料，我反正是看不大明白；哪位要是看懂了，请简单说一下。谢谢！

我都盯了几天了
      没影

原帖由 福建ltycho 于 2007-9-10 12:32 发表

                               
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这些left to right 是什么意思？

从左向右移动

是不是就是常说的行星的顺行和逆行?

Transits of Objects through the LASCO/C3 FOV in 2007
The following list was compiled by Sebastian F. Hoenig. www.sungrazer.org
All dates and magnitudes are approximate.

目标的凌日是在2007年通过LASCO/C3 FOV.下面的这张表由Sebastian F. Hoenig编制。所有的数据和星等都是大约的数值

雅虎邮件组的信息是由编制这份表的Sebastian先生发出。
关于这颗彗星最新的信息被放在了后面第三份perihelion（近日点） passage of 1999
R1.=2003 R5 。通过 A&A paper的预测，通过近日点的时间是在9.11，详见 http://tinyurl.com/2a42um

911



哈哈哈

好的。谢谢你能及时给我们大家翻译啊！

原帖由 suhuasky 于 2007-9-10 15:40 发表

                               
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我都盯了几天了
      没影

不过，我认为：

今晚，要出的这颗Kracht II族彗星，出现的可靠性高达99%；
应该是可以“肯定”的，苏，再坚持两天吧！呵呵！

另外，在SOHO图片上，并不是所有回归的彗星，都能给予编号；
然而，这一颗“应该”还是可以给编号的，那就看是谁第一个发现它了。

还没有呢。

更多的相关消息见：

http://tech.groups.yahoo.com/group/sohohunter/

这几天，我也是根据上面的那个预报图，一直守着呢！
我守了整整三天三夜，最后总算是我发现了它。呵呵！

今天早上（Sep 10 2007 18:10:41）我是第一个报告的，
五分钟后（Sep 10 2007 18:15:28）我又发了个补点报告；
当时，我还真没想到，再过11分钟（Sep 10 2007 18:15:28）
德国的科里奇特（Rainer Kracht）本人就及时给我确认了。

*************************

下面是当时的报告：

Sep 10 2007 18:10:41

Potential comet:
Images: C2; 1024x1024 images.
(0,0) Upper Left.
20070910   
Non-group comet.
1931  745  525
2055  824  505
2130  856  497
--Bo Zhou

-------------------------------------

Sep 10 2007 18:15:28

Further to my post of...
Images: C2; 1024x1024 images.
(0,0) Upper Left.
20070910     18:10:41
Kracht II group comet.
1931  745  525
2055  824  505
2109  837  501
2130  856  497
--Bo Zhou

====================

Sep 10 2007 18:26:56

Confirming comet of:
Images: C2; 2007/09/10     18:10:41
Kracht II group comet.
--Rainer Kracht

----------------------------------------

Sep 10 2007 21:04:37

Known comet now entering:
Images: C3; 1024x1024 images.
(0,0) Upper Left.
20070910   
Kracht II group comet.
23:18  610  480
23:42  614  479
00:18  621  477
--Rob Matson