NGC 6273 / C1659-262 / Messier 19
RA: 17:02:37.80  DEC: -26:16:04.7 (J2000)

(Most recent updates: 
Membership probability flag - 2024; Remaining data - September 2020)
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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        17:02:38.14 -26:15:11.8 m1  16.92   13.85  1.4   B CW    
2        17:02:38.91 -26:13:57.4 m1  14.139  14.15  1.6   B CW    Note
3        17:02:35.83 -26:16:06.5 m1  16.5    13.7   1.4   B CW    
4        17:02:37.57 -26:16:31.6 m1   2.4326 14.75  1.5   B CW    
5        17:02:32.25 -26:18:56.2 m1   0.5072 16.2   1.5   B RR0   
6        17:03:03.46 -26:08:54.2 f    0.5928 15.8   1.4   B RR0   f;Note
7        17:02:11.34 -26:13:51.1 f    0.2444 14.53  0.45  B RR1   f;Note
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Supplementary Notes 

All of the RA and dec in the above table are from Howard Bond (2020, 
private communication) based on Gaia DR2 astrometry.
The remaining data are from Clement and Sawyer Hogg (1978), unless
indicated otherwise on the Notes individual stars.
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Notes on individual stars

V2: Samus (1984) published observations of FK Oph and pointed out 
    that FK Oph = V2 (NGC 6273)

V6,V7:
    Howard Bond (2020, private communication) found that both V6 and V7
    are non-members, based on Gaia DR2 astrometry.

==============================================================
Discovery of the variable stars in M19:

  V1-V4, F1=V6 (=NSV 20887 in the Moscow GCVS)
   Sawyer (1943) with x,y positions and ID chart

   The number V6 was assigned by Clement & Sawyer Hogg (1978)
   
  V5
   announced by Coutts et al. (1975) with x,y position
     and ID chart published by Clement & Sawyer Hogg (1978)

  V7= SVS 2155 
   Samus (1976) with ID chart and 1950 RA and dec 
   The number V7 was assigned by Clement & Sawyer Hogg (1978)
   V7 is also V2135 Oph in the Moscow GCVS

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References

Coutts, C. M., Sawyer Hogg, H., Thompson, D. C., 1975,  Bull. AAS, 7, 536 

Clement, C. C.  & Sawyer Hogg, H. 1978, AJ, 83, 167

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

Samus, N. N. 1976, Astron. Tsirk., 900

Samus, N. N. 1984, IBVS, 2555

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

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