C/2015 F5 (SWAN-XINGMING)可能的历史回归对应

Maik MeyerToday at 12:35 AM
Hello all,

Sergei wrote:

> The orbital period shrinks to ~60 years now.

Indeed, the comet seems to be of intermediate period in the range of 65 +- 10
years. Defintely not parabolic, the deviation from such a restricted orbit are too
large.

I see only C/1449 Y1 (and maybe the comet of 1362) as a possible match, but the
differences in node and peri are too large. The current orbit puts it about 3-5
degrees from the positions recorded in 1449/50. This is too large, even for the
comparably crude positions recorded then.

Cheers, Maik


La marche de la comète de 1449 (C/1449 Y1) observée par Toscanelli (1397-1482) à Florence. Ce croquis de travail est à comparer avec les planches plus élaborées du "Theatrum Cometicum" de Stanislaw Lubieniecki.


C/1449 Y1

Closest to the Earth: 1450 January 26 (0.5035 AU)
Computer            T                AOP   AN (2000.0)   i        q       e         P
Hind          1449 Dec. 9            277      151       75      0.151    1.0      -----
Celoria       1449 Dec. 9.868 (UT)   356.691  268.809  155.679  0.32742  1.0      ----

谢谢楼主！

现在轨道还不准,等数据完善后就会好很多,昨天我已经又补了15个点的数据.周期是肯定的,我认为.

不错的资料！

这个星图绘制的好古典啊！

如果周期真的只是60几年，算清楚应该不难吧。