Globular Cluster IC 1257,
Discovered in 1890 by Spitaler.
- Distance from Sun:
- 81.5 kly
- Distance from Galactic Center:
- 58.4 kly
- Apparent Diameter:
- arc min
- 13.10 mag vis
- Radial Velocity:
- -140.2 +/- 2.1 km/s
- Abs. Mag:
- -6.15 Mag vis
Identified as globular cluster by W.E. Harris et.al in 1997.
On the ground of its discovery by Rudolf Ferdinand Spitaler, this object was
included by Dreyer in his first Index Catalogue as IC 1257, and longly referred
to as an open cluster, although R. Burnham, Jr. remarked
that its classification may be uncertain. It was finally revealed as a globular
cluster only in 1997 (Harris et.al., 1997),
making it Milky Way Globular Cluster No. 147.
Identification as a globular was done by obtaining a color-magnitude diagram,
which immediately revealed its nature as a globular beyond the Galactic Center.
IC 1257 is at a distance of 81,500 light years from our Sun and about
58,400 light years from the Galactic Center. It is approaching us at about
Solution of the IC 1257 puzzle, NGC/IC Project
- Robert Burnham, Jr., 1978.
Burnham's Celestial Handbook, vol. 2, p. 1231.
- William E. Harris, Randy L. Phelps, Barry F. Madore,
Olga Pevunova, Brian A. Skiff, Czernik Crute, Barbara Wilson and
Brent A. Archinal, 1997.
IC 1257: A New Globular Cluster in the Galactic Halo.
Astronomical Journal, Vol. 113, p. 688-691 (Feb 1997)
[MW Globulars] |