NGC 6284 / C1701-246
RA: 17:04:28.51 DEC: -24:45:53.5 (J2000)

(Most recent updates: 
Membership probability flag - 2024; Remaining data - July 2013)
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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
=========================================================================
1        17:04:26.94 -24:45:21.8 m1   4.4812 15.88  0.85  B CW    
2        17:04:25.30 -24:46:17.4 m1   0.5590 17.37  1.59  B RR0   
3        17:04:26.57 -24:46:11.2 f  ----     15.43  1.00  B L
4        17:04:30.32 -24:46:14.0 m1   2.8187 16.04  1.33  B CW    
5        17:04:37.04 -24:49:21.2 f  ----     17.35  --    B CST
6        17:04:38.37 -24:42:11.6 u    0.6530 16.28  1.12  B RR0   f
7        17:04:32.95 -24:45:28.3 f    0.5484 17.33  1.51  B RR0   
8        17:04:31.34 -24:45:17.9 f    0.6658 17.48  0.94  B RR0   
9        17:04:33.98 -24:47:01.1 f    0.5602 17.56  1.62  B RR0   
10       17:04:48.26 -24:43:02.7 u  158.3    15.55  4.20  B M     f
11       17:04:51.60 -24:46:22.8 u    0.5393 17.03  1.46  B RR0   f
12       17:04:38.09 -24:45:25.5 f  203.4    16.52  3.35  B M     f?;GMOph
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Supplementary Notes 

The RA and dec listed in the above table are from Samus et al. (2009).
Samus et al. also noted that V10 and V11 are V2121 and V2123 Oph.
The remaining data were taken from Clement et al. (1980)

A BV color-magnitude diagram by Piotto et al. (2002) indicates a
pronounced blue HB which is a characteristic of globular clusters that
have type II Cepheids (CW stars).  Clusters with Mira variables
generally have red HBs. Also, based on the frequency distribution of
Miras in the surrounding field, it is unlikely that either of the Mira
variables, V10 or V12, are cluster members.  
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Discovery of the variable stars in NGC 6284:

  V1-6 and  4 field variables, F1-F4
    Sawyer (1943) with x,y positions and ID chart

  V7-12
    Clement et al. (1980) with x,y positions and ID chart for V1-12
    and F1-2.
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References

Clement, C. M., Sawyer Hogg, H., Wells, T. R. 1980, AJ, 85, 1604 

Piotto, G., King, I. R., Djorgovski, S. G., Sosin, C., Zoccali, M.,
Saviane, I., De Angeli, F. et al. 2002, A&A, 391, 945

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

Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M.,
Durlevich, O. V. 2009, PASP, 121, 1378

Sawyer, H. B.  1943, Publ. DDO, 1, 14 

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