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J/other/SAAOC/14.11 UBVRI photometry of GSPC stars (Kilkenny+ 1990)
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UBVRI observations of stars in the Guide Star Photometric Catalogue
Kilkenny D., Laing J.D.
<South Afr. Astron. Obs. Circ. 14, 11 (1990)>
=1990SAAOC..14...11K (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry, UBVRI
Abstract:
Photoelectric UBVRI observations are given for 336 stars brighter than
11.5mag from the Hubble Space Telescope Guide Star Photometric
Catalogue (GSPC). Apart from a Declination-dependent effect in the V
magnitudes there are no systematic differences between GSPC
(Cat. <II/143>) and SAAO (Menzies et al., 1989SAAOC..13....1M) data
which are significantly greater than differences between the Landolt
and E-region standard systems. The Declination effect might be due to
the occurrence of unusually high atmospheric extinction coefficients
at CTIO following the eruption of the Mexican volcano, El Chichon.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 65 338 Mean UBVRI data for GSPC stars
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See also:
II/143 : Guide Star Photometric Catalog, Updated Version 1 (Lasker+ 1988,1996)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 6 A6 --- GSPC Star designation from the GSPC
11- 16 F6.3 mag Vmag V magnitude (1)
17- 18 A2 --- n_Vmag [: ] Note on Vmag (1)
20- 25 F6.3 mag (B-V) ? (B-V) colour index (1)
26 A1 --- n_(B-V) Note on (B-V) (1)
28- 33 F6.3 mag (U-B) ? (U-B) colour index (1)
34 A1 --- n_(U-B) Note on (U-B) (1)
36- 41 F6.3 mag (V-R) ? (V-R) colour index (1)
42 A1 --- n_(V-R) Note on (V-R) (1)
43- 48 F6.3 mag (V-I) ? (V-I) colour index (1)
49 A1 --- n_(V-I) Note on (V-I) (1)
51 I1 --- o_Vmag Number of UBVRI observations
52 A1 --- n_o_Vmag [*] Note on o_Vmag (2)
54- 57 I4 10-3mag DVmag Vmag_GSPC_ minus Vmag_SAAO_ (3)
58 A1 --- u_DVmag Uncertainty flag on DVmag
61- 64 I4 10-3mag D(B-V) (B-V)_GSPC_ minus (B-V)_SAAO_ (3)
65 A1 --- u_D(B-V) Uncertainty flag on D(B-V)
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Note (1): The following convention has been used, where D is the difference
between two observations (or the total range in the few cases
where n_Vmag > 2)
D < 0.02 mag : three decimal places given (82%)
0.02 < D < 0.05 mag : two decimal places (13%)
0.05 < D < 0.10 mag : two decimal places with colon ( 3%)
0.10 < D < 0.20 mag : one decimal place with colon ( 1%)
Where D > 0.2 mag, the data have been omitted; this has occurred
mostly for (U-B) of faint red stars. A few stars have V magnitudes
marked with a double colon indicating possible or probable
variability.
Note (2): * implies o_Vmag observations in V magnitude and
o_Vmag + 1 observations in the colours (because on an
occasional "marginal" night the magnitudes were rejected
but the colours retained)
Note (3): As the GSPC data are only quoted to two decimal places, the D values
are given to the nearest 0.005mag.
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History: Prepared via OCR at CDS.
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(End) James Marcout, Patricia Bauer [CDS] 17-Mar-1997