Globular Cluster NGC 6401, class VIII,
Discovered by William Herschel on May 21, 1784.
- Distance from Sun:
- 34.6 kly
- Distance from Galactic Center:
- 8.8 kly
- Apparent Diameter:
- 12.1 arc min
- 9.45 mag vis
- Radial Velocity:
- -65.0 +/- 8.6 km/s
- Abs. Mag:
- -7.90 Mag vis
This globular cluster was first taken for a bright nebula by William Herschel,
and cataloged accordingly as H I.44. John Herschel also described it as a
nebula, as he apparently couldn't resolve it into stars either.
In 1977, Peterson (1977) announced the finding
of another planetary nebula in the neighborhood, and perhaps associated with
globular cluster NGC 6401 in Ophiuchus; this planetary nebula candidate was
cataloged as Peterson 1 (Pt 1; PK 004+03.1).
However, Acker and Stenholm (1990) found that this
object exhibits a red stellar continuum - thus is not a planetary nebula but
a symbiotic star.
- Acker, A. and Stenholm, B., 1990.
Misclassified planetary nebulae.
Astronomy and Astrophysics Supplement Series, Vol. 86, No. 2 (Dec 1990),
- Peterson, A.W., 1977.
A new planetary nebula.
Publications of the Astronomical Socieaty of the Pacific, Vol. 89,
[MW Globulars] |