Central Bureau for Astronomical Telegrams
IAUC 7794: NOVAE IN M31; SATURN VIII (IAPETUS); P/2001 Y1
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Circular No. 7794
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)
NOVAE IN M31
Independent discoveries of three apparent novae in M31 have
been received from M. Fiaschi, F. Di Mille, and R. Cariolato,
Astronomical Observatory 'G. Colombo', Padua, and from B. Swift and
W. D. Li, University of California at Berkeley. The Padua images
were taken with a 0.41-m reflector through H-alpha and R filters,
while the unfiltered Berkeley images were taken in the course of
the LOTOSS (cf. IAUC 7514) with the Katzman Automatic Imaging
Telescope (KAIT). The table gives the Padua positions, offsets,
and discovery magnitudes:
2002 UT R.A. (2000.0) Decl. H_alpha R Offset
Jan. 13.77 0 42 33.79 +41 18 23.7 15.7 18.4 157" W, 135" N
Jan. 13.77 0 42 41.38 +41 16 24.6 14.6 17.3 43" W, 16" N
Jan. 13.77 0 42 52.83 +41 15 10.6 15.9 18.3 128" E, 58" S
On Jan. 14.78 UT, the H-alpha magnitudes for the respective
apparent novae were 16.0, 14.7, and 16.1; nothing was visible at
these locations in Padua H-alpha images (FWHM 6.3 nm) taken on 2001
Sept. 15 (limiting mag 17.5). KAIT position end figures (with
offsets) and magnitudes for each of the three apparent supernovae
on 2002 Jan. 12.1 and 13.1 are: 33s.94, 24".0 (118" west, 135"
north), about 17.5; 41s.26, 24".2 (33" west, 16" north), about
18.0; 52s.75, 10".8 (97" east, 58" south) about 17.5. None of the
three new stars was visible on KAIT images taken on 2001 Dec. 19.2
(limiting mag about 19.0).
SATURN VIII (IAPETUS)
G. Black, National Radio Astronomy Observatory; D. Campbell,
L. Carter, Cornell University/NAIC; and S. Ostro, Jet Propulsion
Laboratory, announce the detection of radar echoes from Saturn VIII
(Iapetus) on Jan. 8-10 using the Arecibo Observatory's 13-cm-
wavelength radar: "The observations were of the brighter trailing
hemisphere and centered at a satellite longitude of 260 deg west.
The radar scattering properties of Iapetus are very different from
those of the icy Galilean satellites, with the cross section
significantly lower and the circular polarization ratio < 1."
COMET P/2001 Y1 (HELIN-LAWRENCE)
Further to IAUC 7790, T. Oribe reports that his CCD images
taken on 2001 Dec. 24.86 UT show a 0'.15 coma and an 8" tail in
p.a. 295 deg.
(C) Copyright 2002 CBAT
2002 January 17 (7794) Daniel W. E. Green
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