我在yahoo论坛的内容
Just came back from outside. the 17p is as bright as a new bright star
in Per. Naked eye easily find it in the night sky. The constellation
of Perseus changes her figure and I was not able to recognize it at
the beginning!
Observation made just a few minutes ago on Oct 25, 5:10 to 6:15 UT.
Clear sky with almost full moon. Naked eye visibility 4m if away from
the bright moon. To a naked eye, 17p looks like a 2.5 magnitude new
star. Using 6cm retractor, total brightness comparison gives magnitude
2.0 to 1.9. at 76x, the nearly round shape coma measures about 62" by
58" with DC=9. The coma is very bright, easy to distinguish even from
not-so-dark background. Both coma and false nucleus are yellow to
orange color, but my photo shows green halo also. The coma is slightly
elongated in a north-south direction. The false nucleus is 10" by 6",
easily distinct out of coma by its brightness and sharp border. The
nucleus is very dense, stay in the center of the coma (may be off a
little bit) with also elongated in a north-south direction, no tail.
David Z Young
Brenham, TX, USA.
如果猛然看英仙座，我竟然会认不出来，因为它的形状变了，多了一颗星！
我的估计有2等。 |
显身卡
