SN2001dh in ESO 340-9 ( 20h 17mn24.16ss -38°40'37.4" )
offset 38.7" E 11.2" S magnitude 15.5
Telescope LX200 12" f/d 2.7 ST7E UAI173 Ste Clotilde REUNION ISLAND
2001/07/22.88 unflated binning 2x 60s
2001/06/18.12 unflated limiting mag 19 binning 2x 60s
confirmation image 2001/07/24.85 mag 15.5 180s
referenced image DSS UK Schmidt 1978/09/24.4 limiting mag 21
SUPERNOVA 2001dh IN MCG -6-44-26
R. Chassagne, Ste. Clotilde, Ile de Reunion, reports the
discovery of an apparent supernova (mag about 15.5) on unfiltered
CCD images taken on July 22.88 and 24.85 UT with a 0.3-m reflector.
The new object is located at R.A. = 20h17m24s.16, Decl. =
-38o40'37".4 (equinox 2000.0), which is 38".7 east and 11".2 south
of the nucleus of MCG -6-44-26 (= ESO 340-G9). Images taken on
June 18.1 and 26.1 show nothing at this position (limiting mag
about 19.0), and SN 2001dh does not appear on a Digital Sky Survey
image taken with the U.K. Schmidt 1.2-m telescope on 1978 Sept.
24.4 (limiting mag about 21.0).
R. Chassagne has discovered his 10th SN (the 9th was SN 2001cz),
which is in the quite neighbouring galaxy. Congratulations, Robin!
IAUC 7670 informed that the discovery was made on July 22.88 and
confirmed on July 24.85. The brightness of the new object was 15.5
(unfiltered CCD) at the discovery, and probably at the confirmation.
The position is R.A. = 20h17m24s.16, Decl. = -38o40'37".4 (2000.0),
which is about 39" east and 11" south of the nucleus of the edge-on
and warped dim galaxy (type Sdm on NED, or Sc/Ir on SIMBAD) MCG
-6-44-26. It was not detected on June 26.1.
The host galaxy has a relatively dim central region and elongates
towards east. The SN is somewhat (5-6") south of this elongated arm.
The recession velocity of MCG -6-44-26 is around 2600 km/s, which
suggest that the typical SN Ia on this galaxy can reach mag 14. The
follow-up photometry and spectroscopic type determination is needed
for this southern SN.
Hitoshi Yamaoka, Kyushu Univ., Japan
SUPERNOVAE 2001dh, (2001dj) and 2001dl
F. Patat, European Southern Observatory; C. Contreras and J. Prieto, Universidad Catolica de Chile; and G. Altavilla, S. Benetti, E. Cappellaro, A. Pastorello and M. Turatto, Osservatorio Astronomico di Padova, report: "Spectra of three candidate supernovae were obtained on Aug. 8 using the Danish 1.5-m telescope + DFOSC (spectral range 320-900 nm, resolution 1.2 nm) at La Silla. 2001dh (IAUC 7670) is a type-II supernova, about 1 month after maximum, the spectrum being dominated by the H alpha P-Cyg line with the absorption minimum measured at 641 nm and yielding an expansion velocity of about 9000 km/s, assuming the NED recession value of 2608 km/s for the parent galaxy; other strong lines are H beta (478 nm), Fe II (513 and 497 nm) and Ca II (842 nm). 2001dj (IAUC 7674) is not a supernova but most likely a galactic variable of early-F spectral type. 2001dl (IAUC 7675) is a type-Ia supernova, its spectrum being very similar to that of SN 1994D at maximum (cf. Patat et al. 1996, Monthly Notices Roy. Astron. Soc. 278, 111); the characteristic Si II absorption is measured at 627 nm, and given the NED recession velocity of 6204 km/s for the parent galaxy, the expansion velocity is as large as 10 000 km/s."