杨睿 XM09AD=good01=P/2009 L2(Yang-Gao)* 彗星

2009年6月16日,由中科大研究生浙江的杨睿用XWASS-CSP系统图片发现,后被命名为C/2009 L2(Yang-Gao)

http://www.cfa.harvard.edu/mpec/K09/K09M05.html

http://www.astronomy.com.cn/bbs/thread-113291-1-3.html

Electronic Telegram No. 4111

 

Central Bureau for Astronomical Telegrams

INTERNATIONAL ASTRONOMICAL UNION

CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;

20 Oxford St.; Cambridge, MA  02138; U.S.A.

e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)

URL http://www.cbat.eps.harvard.edu/index.html

Prepared using the Tamkin Foundation Computer Network

 

COMET P/2015 J4 = P/2009 L2 (YANG-GAO)

  1. Sato, Tokyo, Japan, reports his recovery of comet P/2009 L2 (cf. IAUC

9052) on CCD images obtained with an 0.51-m f/6.8 astrograph (+ luminance

filter) at Siding Spring.  The comet appeared stellar on May 11 in ten stacked

60-s exposures; the w-band magnitude tabulated below for that date was

measured within a circular aperture of radius 6″.6.  The comet appeared

cometary on June 9, with a faint outer coma 15″ in diameter and a fan-like

tail 30″ long spanning p.a. 45-135 degrees in eight stacked 60-s exposures;

the tabulated magnitude for June 9 were measured within a circular aperture

of radius 8″.8.  Eight stacked 60-s follow-up exposures by Sato on June 10.36

UT show the comet to be moderately condensed with a faint coma 12″ in

diameter and a fan-like tail 20″ long spanning 40-130 degrees; he measured

magnitude 18.3 within a circular aperture of radius 6″.6.

2015 UT             R.A. (2000) Decl.       Mag.   Observer

May  11.38368    9 21 24.94   – 6 48 01.6          Sato

11.38579    9 21 25.07   – 6 48 00.8              ”

11.38790    9 21 25.23   – 6 48 00.2   19.1     ”

June  9.37566   10 12 16.84   – 6 25 38.3              ”

9.37736   10 12 17.04   – 6 25 38.3              ”

9.37905   10 12 17.25   – 6 25 38.9   18.6     ”

The indicated correction to the prediction by B. G. Marsden on MPC 79350 is

Delta(T) = +0.10 day.

The following linked orbital elements by G. V. Williams are from 1052

observations spanning 2009 June 15-2015 June 9 (mean residual 0″.5).

Additional elements and an ephemeris appear on MPEC 2015-L28.

Epoch = 2015 Aug.  6.0 TT

T = 2015 Aug. 15.13638 TT        Peri. = 343.56508

e = 0.5936996                             Node  = 257.62554 2000.0

q = 1.4310835 AU                      Incl. =  16.69224

a =  3.5222304 AU   n = 0.14909993   P =   6.61 years

NOTE: These ‘Central Bureau Electronic Telegrams’ are sometimes

superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2015 CBAT

2015 June 10                     (CBET 4111)              Daniel W. E. Green

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