Hello,
Well, on my 3rd attempt, I finally succeeded in recording the globular cluster Tonantzintla 2 in Scorpius!
Thursday night saw me collecting photons from the incorrect region of Scorpius due to using The SkyX and SAC Ton 2 as the “GoTo” coordinates, with Friday night delivering cloud cover and showers. Saturday night found me pointing at the correct region, thanks to SkyTools 3 Pro, although intermittent clouds compelled me to collect the Luminance data E of the meridian and the RGB data on the West. The location of Ton 2 in The SkyX was awry by approx. 20 arcmin.
The globular cluster Tonantzintla 2 (Pismis 26) was discovered by Paris Pismis in 1959 on Schmidt plates taken at the Tonantzintla Observatory, Mexico. The cluster is also designated GCL B1732-3831, BH 236 and ESO 333-SC16. A relatively lesser known globular, its color magnitude diagram was finally taken in 1996 by Ortolani, et al. They found a red horizontal branch in a moderately loose cluster. It’s location at 2 Kpc from the galactic center makes it is a member of the bulge population of globulars, but is only moderately metal rich. It lies 6.4 kpc from the Sun.
- The first image file is the full frame 1600x1200 resampled down to 800x600.
- The second image file is an 800x600 full resolution crop from the centre of the frame.
A summary from SkyTools 3 Pro:- Ton 2
- Globular Cluster
- R.A.: 17h36m11.0s Dec.: -38°33'12" (2000) in Scorpius
- Magnitude: 12.20
- Size: unknown
- Apparent Data for 2011 Jul 23 GMT+10 at Brisbane, Australia:
- Apparent RA: 17h37m01.7s, Apparent Dec: -38°33'39"
http://spider.seds.org/spider/MWGC/ton2.html
http://home.ix.netcom.com/~bwilson2/...fGClusters.htm
Thanks for looking!
Dennis