SN 2002hy
SN 2002hy was discovered by B. Monard on images taken on Nov. 12 at 16.4mag.
NGC 3464, a host galaxy of SN 2002hy, has also produced SN Ic 2002J (reported
brightest mag = 16.4) in this January (vsnet-alert
7079). NGC 3464 is an open spiral galaxy, and SN is superimposed on
the inner northern arm. It seems to be a rather bright core-collapse event
(like as SN Ic) or a somewhat reddened SN Ia near the maximum light (vsnet-campaign-sn
505). According to IAUC 8019, the ESO team revealed that it was a peculiar
type-Ib supernova soon after explosion. He I lines were prominent, and
they had P-Cyg profiles (v_exp about 9500 km/s derived from He I 587.5
nm absorption minimum). Narrow H-alpha and H-beta absorption lines were
identified at v_exp about 16000 km/s, which were probably made by the outermost
thin hydrogen-rich layer. It was considerably reddened (E(B-V) about 0.17),
so its luminosity was somewhat larger than normal SN Ib (vsnet-campaign-sn
508).