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IAUC 8810: ANOTHER Poss. N IN Sco; C/2007 D3

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                                                  Circular No. 8810
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)


ANOTHER POSSIBLE NOVA IN SCORPIUS
     H. Yamaoka, Kyushu University, reports the discovery by Yuji
Nakamura (Kameyama, Mie, Japan) of a variable star (mag 9.3) on two
unfiltered CCD images taken with a 135-mm lens on Feb. 19.8593 UT
(not present to mag 12.0 on Feb. 14.8575); the position was stated
as being within 30" of the red star GSC 7367.712 (R.A. =
16h56m58s.0, Decl. = -35o21'39", equinox 2000.0, mag 13.3; variable
according to ASAS).  K. Itagaki (Yamagata, Japan) obtained an
unfiltered CCD image with a 0.60-m reflector on Feb. 20.85,
concluding that a new star of mag 8.8 is located at R.A. =
16h56m59s.35, Decl. = -35o21'50".2; Itagaki notes that nothing is
visible at this position on the Digitized Sky Survey, so it is
likely to be a nova.  S. Nakano, Sumoto, Japan, reports the
independent discovery of this variable by Hideo Nishimura (Miyawaki,
Kakegawa) at mag 9.2 on two T-Max 400 films taken on Feb. 20.8365
and 20.8370 using a Pentax 6x7 camera (the position end figures
given as 55s, 59"), with nothing visible at this location on his
survey film taken on Feb. 15.8 (limiting mag 11.0).


COMET C/2007 D3 (LINEAR)
     An apparently asteroidal object discovered by the LINEAR
project (discovery observation tabulated below) has been found to
show cometary appearance following posting on the Minor Planet
Center's 'NEOCP' webpage.  Thirty stacked 75-s CCD exposures taken
on Feb. 20.94-20.96 UT by C. Jacques and E. Pimentel (Belo
Horizonte, Minas Gerais, Brazil, 0.30-m f/3 Schmidt-Cassegrain
telescope) show a central condensation 5" in diameter and a small
fan tail 15" long in p.a. 98 deg.  J. E. McGaha (Tucson, AZ, U.S.A.,
0.36-m f/10 Schmidt-Cassegrain reflector) writes that his CCD
images from Feb. 21.2 show a 4" coma surrounding a faint, stellar,
nuclear condensation, with no elongation or tail visible.  R. E.
Hill (Mount Lemmon 1.5-m reflector) reports that his stack of four
unfiltered 30-s CCD frames taken on Feb. 21.2 (in 2"-2".5 seeing)
show a coma diameter of 10"-12" and again no tail.

     2007 UT             R.A. (2000) Decl.       Mag.
     Feb. 20.09455    5 36 56.96   -19 37 15.5   19.2

The available astrometry, preliminary parabolic orbital elements
(T = 2007 May 26.804 TT, q = 5.22363 AU, Peri. = 309.100 deg, Node
= 148.199 deg, i = 46.004 deg, equinox 2000.0), and an ephemeris
appear on MPEC 2007-D30.

                      (C) Copyright 2007 CBAT
2007 February 21               (8810)            Daniel W. E. Green

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