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Table 1

NGC 1851 and NGC 1904 basic properties from Harris 1996.

NGC 1851
RA, Dec (2000) 05:14:06.3  − 40:02:50 Coordinates of cluster center
L,B 244.51  − 35.04 Galactic coordinates
Rsun 12.1 kpc Distance from sun
RMW 16.7 kpc Distance from Milky Way center
Vlos 320.5 km s-1 Line of sight radial velocity
MV  −8.33 Total V band magnitude
Mass/M 1.8 × 105 From luminosity assuming M/LV = 1
rh 0.52 arcmin or 1.83 pc Half light radius
rt 11.7 arcmin or 41.2 pc Tidal radius
r0 4.1 arcmin or 14.5 pc Radius where a = 1.2 × 10-8 cm s-2
Scale factor 3.52 pc/arcmin
NGC 1904
RA, Dec (2000) 05:24:10.6 −24:31:27 Coordinates of cluster center
L,B 227.23−29.53 Galactic coordinates
Rsun 12.9 kpc Distance from sun
RMW 18.8 kpc Distance from Milky Way center
Vlos 206.0 km s-1 Line of sight radial velocity
MV  −7.86 Total V band magnitude
Mass/M 1.2 × 105 From luminosity assuming M/LV = 1
rh 0.80 arcmin or 3.0 pc Half light radius
rt 8.34 arcmin or 31.3 pc Tidal radius
r0 3.1 arcmin or 11.7 pc Radius where a = 1.2 × 10-8 cm s-2
Scale factor 3.75 pc/arcmin

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