Dwarf Irregular Galaxy SDIG (PGC 621), type IBm,
Dwarf Irregular Galaxy SDIG was discovered in 1976 by a team of ESO
astronomers, see Lautsen et.al. (1977).
R.M. West first found it on a photographic plate taken with the ESO 1-m
Schmidt telescope on October 22, 1976 by G. and O. Pizarro; further plates
were consequently obtained on both the 1-m ESO Schmidt telescope and the
then-new ESO 3.6-m telescope by S. Lautsen. They found that this new galaxy
was definitely far beyond and thus unconnected to the nearby Magellanic
Stream, and very probably beyond the borders of the Local Group.
- 00 : 08.2
- -34 : 35
- + 207 km/s
- 10,000 kly
- Apparent Dimension:
- 1.1 x 0.9 arc min
- +15.5 mag
- Abs. Mag:
Kraan-Korteweg & Tammann (1979) suspected it to
be a possible member of the Local Group.
Meanwhile however (e.g., Miller 1996), evidence has
been confirmed that this galaxy is very probably a member of the
Sculptor Group of
Galaxies, sometimes called the South Polar Group, around famous
NGC 253, at
a distance of about 10 million light-years.
- Kraan-Korteweg & Tammann, 1979.
Astronomische Nachrichten, Vol. 300, p. 181.
- S. Lautsen, W. Richter, J. van der Lans, R.M. West
and R.N. Wilson, 1977.
A New Dwarf Galaxy Photographed with the ESO 3.6 m Telescope.
Astronomy and Astrophysics, Vol. 54, p. 639-640
- Bryan W. Miller, 1996.
The Star Formation Histories of Sculptor Group Dwarf Galaxies. I.
Current Star Formation Rates and Oxygen Abundances.
Astronomical Journal, Vol. 112, No. 3, p. 991-1008 (September 1996)
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Last Modification: October 23, 2003