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Type: globular cluster
Mag: B=11.2, V=11.24
John Herschel recorded it as "pretty bright; a little extended; very gradually brighter in the middle; 40 arcsec."
Kron, G. E. (1956) Star Clusters in the Small Magellanic Cloud: I. Identification of 69 Clusters. PASP, Vol. 68. [1956PASP...68..125K]
Describes it as a red cluster, noting the absence of nebulosity and the absence of bright blue stars. He classifies it as a globular cluster.
Lindsay, E. M. (1956) Clusters in the Small Magellanic Cloud. Irish Astronomical Journal, Vol. 4. [1956IrAJ....4...65L]
Classifies it as a globular cluster. He writes: "NGC 121 was of course accepted as globular after the discovery of cluster-type variables in it by Thackeray and Wesselink."
Van den Bergh and Hagen ("UBV photometry of star clusters in the Magellanic Clouds", Astronomical Journal, Vol. 73, 1968) find that the integrated V magnitude through a 60'' diaphragm is 11.3. They note that it is an old cluster with a B-V = 1.9.
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.0 mag globular cluster in the SMC.
Tifft 1963: * WSW V=12.96/1.19.
Alvarado+ 1991 A&ASuppl 90,191: * WSW V=13.01/1.22.
15cm - mod br circ glow @ 140x, m12.5 * WSW side. halo reaches 2/3 distance to this *. core 1/3 total diam. strong broad concen, sl clumpy texture. BS, 8Nov1993, LCO.
1994-12-04, Die Boord, 6-inch f/8.6 Newtonian. A most unimpressive globular cluster, in the same field as NGC 104. At first difficult but later easily seen as an out of focus small star.
The Messier objects
The Bennett objects
The Caldwell list
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