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V/28 Proper Motions, UBV Photometry, Four Open Clusters (Frolov 1980)
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Beginning of ReadMe :V/28 Proper Motions, UBV Photometry, Four Open Clusters (Frolov 1980)
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Proper Motions and UBV Photometry of Stars in the Region of
Open Clusters NGC 7788, NGC 7790, Berkeley 58 and Anonymous
Frolov V.N.
<Pulkovo Obs. (1980)>
=1977IzPul.195...80F
=1979IzPul.196...69F
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ADC_Keywords: Clusters, open ; Proper motions ; Photometry, UBV ;
Regional catalog
Abstract:
Proper motions were determined for 2169 stars with limiting
magnitude B = 16.5 mag and located within a 60x60' area centered at
RA = 23h54.2min, Dec = 60deg57arcmin (1950.0). Three plate pairs
with a mean epoch difference of 49 years were used. The first epoch
plates were taken with the Tashkent normal astrograph during 1923-1925
and the second epoch plates with the Pulkovo normal astrograph. The
proper motions have a mean error +/-0.0030 arcsec (B < 14.5 mag) and
+/-0.0036 arcsec (B > 14.5 mag) and were measured relative to
reference stars with 13.5 mag <= B <= 14.5 mag.
Photographic UBV magnitudes were measured using Sandages photoelectric
standards. The U, B and V magnitudes were determined for 1930, 2165
and 1734 stars respectively, with the corresponding mean errors
+/-0.03 mag, +/-0.06 mag and +/-0.05 mag.
In the measured area there are three known open clusters (NGC 7788,
NGC 7790 and Berkeley 58) and a previously unknown open cluster,
discovered by the author, centered at RA =23 h 54.9 min, Dec = 61 deg
21 arcmin (1950.0). The cluster members were selected on the basis of
the proper motion (vector diagram) and photometric (V B-V and U-B
B-V) criteria. Stars within areas with 4 arcmin radii centered on NGC
7788 and NGC 7790 and 6 arcmin radii centered on Berkeley 58 and the
anonymous cluster were investigated for cluster membership.
The method of reduction of the observational data and the results
obtained have been published in Izv. Pulkovo 195, 80, 1977 and
196, 69, 1979.
Objects:
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RA (2000) DE Designation(s)
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23 54.9 +61 21 C 2354+613 = Frolov 1
23 56.7 +61 24 C 2354+611 = NGC 7788
23 58.4 +61 13 C 2355+609 = NGC 7790
00 00.2 +60 58 C 2357+606 = Berkeley 58
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