Central Bureau for Astronomical Telegrams
IAUC 7492: P/2000 R2; V723 Cas
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 7493
.dvi or
.ps format.
Circular No. 7492
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
COMET P/2000 R2 (LINEAR)
An object reported as asteroidal by the LINEAR team on Sept.
3, and subsequently posted on the NEO Confirmation Page, has been
reported as cometary in appearance on various CCD exposures: Sept.
7.2 UT, condensed 9" coma (D. Balam, Victoria, 1.82-m reflector);
Sept. 7.9, object seemed diffuse with a faint east-west tail about
10" long (M. Tichy, Klet, 0.57-m reflector); Sept. 18.51, near-
stellar condensation with a fairly narrow 40" tail in p.a. 90 deg
(R. H. McNaught, Siding Spring, 1.0-m reflector + 100-s R frames).
The available astrometric observations are given on MPEC 2000-S04,
where orbital elements show this to be a short-period comet.
2000 UT R.A. (2000) Decl. m2 Observer
Sept. 3.14818 19 54 00.63 -14 41 32.0 18.7 LINEAR
T = 2000 Sept.12.7665 TT Peri. = 147.2011
e = 0.590057 Node = 187.3825 2000.0
q = 1.392287 AU Incl. = 3.2336
a = 3.396297 AU n = 0.1574692 P = 6.259 years
V723 CASSIOPEIAE
D. K. Lynch, R. J. Rudy, S. Mazuk, and C. Venturini, The
Aerospace Corporation; R. C. Puetter, Center for Astrophysics and
Space Science, University of California at San Diego; and T.
Armstrong, Thomas K. Armstrong Development Corporation, report
0.8-2.5-micron spectrophotometry of V723 Cas = N Cas 1995 using the
Lick Observatory 3-m telescope and the Aerospace Near Infrared
Imaging Spectrograph (NIRIS) on July 20.45 UT, about 4.6 yr after
peak brightness: "The spectrum resembled that of a late-stage
classical nova, displaying forbidden lines of singly and doubly
ionized sulfur and neutral nitrogen, along with strong permitted
lines of H I, He I, and He II. The strongest feature is He I
1.0830-microns. Very strong coronal lines are also present,
including [Si VI] at 1.9629 microns, [Ca VIII] at 2.3214 microns,
[Si VII] at 2.4827 microns, and possibly [Al IX] at 2.0469 microns.
The underlying continuum decreased toward the red and was
indicative of free-free emission. There was no evidence of thermal
emission from dust in the region 1-2.5 microns. J, H, and K
magnitudes determined from the spectrum are 12.6, 12.6, and 11.7,
respectively. The shape of the spectrum seems to have changed
little since the 1999 report by Rudy et al. (IAUC 7259), although
its absolute level has decreased by about a factor of 2."
(C) Copyright 2000 CBAT
2000 September 18 (7492) Daniel W. E. Green
Read IAUC 7493
.dvi or
.ps format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.
