Terzan 12 / C1809-227 / ESO522-SC1
RA: 18:12:15.8  DEC: -22:44:31    (J2000)

(Most recent updates: 
Membership probability flag - 2024; Remaining data - May 2014)
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Bytes  Format      Explanation
1-8      A8        Star ID
10-32  A11,1x,A11  Position
34-35    A2        Membership probability flag based on data published
                   by Prudil & Arellano Ferro (2024)
                    m1: prob >=0.85;  m2: prob >=0.7 and <0.85;
                    m3: prob >= 0.5 and <0.7; f: prob <0.5
                    u:  no data available
37-44   F8.4       Period  (days)
46-51   F6.3       Mean magnitude (or maximum magnitude if "max" 
                      is indicated in the remarks column)
53-57   F5.3       Light amplitude (range of variability)
59      A1         Colour for mean magnitude and amplitude
                    e.g.  B, V, R, I, J, K
                    or P (for photographic).
61-65   A5         Type of variable (draft 2006 GCVS classifications)
                      CST denotes non variable stars previously designated
                      as variables
67-80   A19        Notes and Remarks  (f denotes field star)
 
 "--" or "----" indicates no data available
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ID       Position               Mem   Period <mag>  ampl  C Type  Notes/
         RA          Dec        Flag                              Remarks
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1        18:12:14.18 -22:43:58.9 u  458.0     6.23  1.02  K M
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Supplementary Notes

Ortolani et al. (1998) published a VI CMD which had a red HB, a
characteristic of a metal-rich cluster and estimated a tentative value 
[Fe/H] = -0.5 based on the slope of the RG branch.

The data for V1 are from Sloan et al. (2010) who conclude that the star
is a cluster member.
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Discovery of the Variable Stars in Terzan 12 

V1
  Sloan et al. (2010)  with RA and dec

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References

Ortolani, S., Bica, E., Barbuy, B. 1998, A&AS, 127, 471

Prudil Z., Arellano Ferro, A. 2024, MNRAS, 534, 3654

Sloan, G. C., Matsunaga, N., Matsuura, M., Zijlstra, A. A., Kraemer, K.
E., Wood, P. R., Nieusma, J., Bernard-Salas, J., Devost, D., Houck, J. R. 
2010, ApJ, 719, 1274
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