Central Bureau for Astronomical Telegrams

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IAUC 7768: SNe; 2001ib; 2001hf

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                                                  Circular No. 7768
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)


SUPERNOVAE
     Further to IAUC 7767, SNe 2001hi, 2001hj, 2001hn, and 2001ho
were present in the Sept. 11 images but were not present on images
taken in Oct./Nov. 1999 (cf. IAUC 7312).  SN 2001hu was not present
on 2001 Oct. 13 (limiting mag 25.4); the remaining supernovae were
not present on Sept. 11 (limiting mag 25.8).


SUPERNOVA 2001ib IN NGC 7242
     The discovery of an apparent supernova (mag 15.3), located
about 9"-10" west and 1" north of the center of NGC 7242, has been
reported independently on unfiltered CCD images taken by M.
Armstrong, Rolvenden, Kent, England, on Dec. 7.808 and 7.844 UT
(0.35-m reflector) and by R. Arbour, South Wonston, Hampshire,
England, on Dec. 7.786 (0.3-m reflector).  Armstrong measures SN
2001ib to be at R.A. = 22h15m38s.72, Decl. = +37o17'56".0 (equinox
2000.0); Arbour provides position end figures 38s.43, 56".0.  T.
Boles obtained confirming images on Dec. 7.824 and 7.828.  Nothing
is present at this location on Armstrong's images taken on Aug. 20
(limiting mag 19.5) and Nov. 15 (limiting mag 19.0) or on a red
Palomar Sky Survey image taken 1986 Oct. 1 (limiting mag 20.8).


SUPERNOVA 2001hf IN MCG -03-23-17
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2001hf (cf. IAUC 7765), obtained by E. Falco on
Dec. 6.51 UT with the F. L. Whipple Observatory 1.5-m telescope (+
FAST spectrograph), shows it to be a type-II supernova near maximum
light.  The spectrum consists of a blue continuum with superposed
P-Cyg lines of hydrogen.  Adopting the NASA/IPAC Extragalactic
Database recession velocity of 4486 km/s for the host galaxy, the
expansion velocity derived from the minimum of the H-beta line is
6900 km/s.  In addition, images of SN 2001hf obtained by R.
Kirshner and S. Jha on Dec. 5.31 with the Baade 6.5-m telescope at
Las Campanas yield the following precise position for the supernova:
R.A. = 9h05m07s.46, Decl. = -18o31'04".5 (equinox 2000.0;
uncertainty +/- 0".08).  Derived magnitudes are R about 16.6 and I
about 16.3.  The fine seeing conditions (FWHM about 0".4) during
these observations reveal that a bright foreground star is situated
near the nucleus of MCG -03-23-17 and that the nucleus is
elongated; the supernova is 4".47 west and 6".94 north of the star,
and 8".95 west and 4".28 north of the apparent center of the nucleus.

                      (C) Copyright 2001 CBAT
2001 December 7                (7768)            Daniel W. E. Green

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