NGC 6254 / C1654-040 / Messier 10
(Updated 2009)

RA: 16:57:08.9  DEC: -04:05:58 (J2000)

============================================================
Bytes  Format      Explanation
1-8      A8        Star ID
10-32  A11,1x,A11  Position
34-35    A2        Units for position
                    R0 denotes RA, DEC in the J2000 coordinates
                    R5 denotes RA, DEC in the 1950 coordinates
                    XA denotes X, Y in arcseconds 
                    XP denotes X, Y in pixels
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 
                    or P (for photographic).
61-65   A5         Type of variable (draft 2006 GCVS classifications)
                      NV denotes not variable
67-80   A19        Notes and Remarks  (f denotes field star)
 
 "--" or "----" indicates no data available
=========================================================================
ID       Position                     Period <mag>  ampl  C Type  Notes/
         RA/X        Dec/Y     Units                              Remarks
=========================================================================
1        16:57:10.12 -04:05:36.1 R0  50.0    13.8   1.5   P SR    Note
2        16:57:11.74 -04:03:59.7 R0  18.7226 11.83  1.18  V CW    Note
3        16:56:55.96 -04:04:16.4 R0   7.831  12.76  0.45  V CW    Note
4        --          --             ----     --     --      RR?   Note
======================================================================

Notes on individual stars

V1:     Period, magnitude, amplitude and variablility type for V1
        by Clement et al. (1985, AJ 90, 1238)
        The RA & dec are from the 2MASS catalog (Brian Skiff,
        private communication)

V2:     Period from Clement et al. (1985), magnitude, amplitude 
        and variablility type from Arp (1955, AJ 60, 1).
        The RA & dec are from the 2MASS catalog (Brian Skiff,
        private communication)

V3:     Period from Clement et al. (1985), magnitude, amplitude 
        and variability type from Arp (1955, AJ 60, 1)
        The RA & dec are from the UCAC2 catalog (Brian Skiff,
        private communication)

V4:     variability type for V4 from Voroshilov (1971, 
        Astron Tsirk 623, 7)

==================================================================
Discovery of the variable stars in M10:

  V1&2
    Sawyer (1938, Pub DAO, 7, no. 5) with ID chart
    and x,y coordinates

  V3
    Arp (1955, AJ 60, 1) with ID chart for V2&3.
    Sawyer (1955, Pub DDO, 2, no. 2) listed x,y coords in 
       her catalogue

  V4 = Arp IV-37 (see Arp 1955, AJ, 60, 317)
       by Voroshilov (1971, Astron Tsirk 623, 7) who found that 
       this was an HB star in the instability strip. The number V4
       was assigned by Sawyer Hogg (1973) in her 3rd catalogue.

  Field variables not listed above
       M10:V1-3 by von Braun et al. (2002, AJ 124, 2067)
         vB#1 is a foreground WUMa, #2 is a background RR0
         and #3 is a background SXPhe (or delta Scuti)

  Pietrukowicz et al. (2008, MNRAS 388, 1111) searched for
  dwarf novae in M10 and found none.