Central Bureau for Astronomical Telegrams
IAUC 7999: 2002hb, 2002hc, 2002hd; 2002gy, 2002ha
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Circular No. 7999
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 2002hb, 2002hc, 2002hd
Three apparent supernovae have been discovered. SN 2002hb was
found by W. M. Wood-Vasey, G. Aldering, and P. Nugent on unfiltered
NEAT images taken with the Palomar 1.2-m Schmidt telescope (cf.
IAUC 7996). SNe 2002hc and 2002hd were found on unfiltered KAIT
CCD images taken by LOTOSS (cf. IAUC 7906) and reported by B.
Beutler, P. Martin, M. Papenkova, and A. V. Filippenko. Additional
magnitudes from images taken by the respective groups for each
object: SN 2002hb, Sept. 3, [20.5 (S/N = 5); Oct. 3, 18.9; 21,
19.3. SN 2002hc in NGC 2559, Apr. 9, [19.0:; Oct. 24, 17:. SN
2002hd in MCG -01-23-8, Apr. 9, [19.0:; Oct. 25, 18:.
SN 2002 UT R.A. (2000.0) Decl. Mag. Offset
2002hb Sept. 11.35 22 56 03.58 +13 37 31.0 18.7 0".7 S
2002hc Oct. 23 8 17 06.05 -27 27 27.0 17 1".1 E, 7".2 S
2002hd Oct. 24 8 54 04.68 - 7 10 59.5 18 19".5 W, 21".5 S
M. Hamuy, Carnegie Observatories, reports that a spectrum
(range 360-900 nm) of SN 2002hc, obtained on Oct. 25.34 UT with the
Las Campanas Baade 6.5-m telescope (+ LDSS2), shows it to be a
type-II supernova. A broad H-alpha line is seen in emission with
no significant absorption counterpart. The spectrum is very
similar to that of the 'linear supernova' 1979C when 43 days past
maximum (Filippenko 1997, ARAA 35, 309).
SUPERNOVAE 2002gy AND 2002ha
Hamuy also reports that a spectrum of SN 2002ha (cf. IAUC
7997), obtained as above on Oct. 25.03 UT, shows it to be a type-Ia
supernova about 3 days before maximum light, very similar to SN
1994D. A narrow interstellar Na I D absorption line at the
redshift of the host galaxy can be seen with an equivalent width of
0.1 nm. Hamuy adds that a spectrum of SN 2002gy (cf. IAUC 7996),
obtained on Oct. 25.21, bears resemblance to the type-Ib/c SN
1999ex. A prominent absorption at rest wavelength 614 nm can be
seen, which could be due to Si II 635.5-nm or high-velocity H-alpha.
A narrow interstellar Na I D absorption line at the redshift of the
host galaxy is present with an equivalent width of 0.32 nm, which
suggests significant reddening.
(C) Copyright 2002 CBAT
2002 October 25 (7999) Daniel W. E. Green
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