J/A+A/356/L21 BR photometry of ON 231 (Belokon+, 2000)
ON 231: the testing of 3.8-year period for optical outbursts
with multi-peak structure.
Belokon E.T., Babadzhanyants M.K., Pollock J.T.
<Astron. Astrophys. 356, L21 (2000)>
=2000A&A...356..L21B
ADC_Keywords: BL Lac objects ; Photometry, CCD
Keywords: galaxies: BL Lacertae objects: general -
galaxies: BL Lacertae objects: individual: ON 231
Abstract:
We present R- and B-band CCD observations of ON 231 that were made at
the Dark Sky Observatory at Appalachian State University (DSO-data)
during 37 nights in April 1998 - December 1999. The observations have
been obtained in connection with current microvariability studies but
this paper presents only the nightly averaged R and B magnitudes
together with other details of these observations. These data were
used to verify the 1395-day period proposed from the analysis of the
prior data (all B-band data available in the 1971-1997 time interval).
To transform R-band observations to B we used the equation:
B=1.107*R-0.653.
Objects:
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RA (2000) DE Designation(s)
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12 21 31.7 +28 13 59 ON 231 = W Com = B2 1219+28
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 56 R- and B-band photometry of ON 231 (DSO-data)
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See also:
J/A+AS/127/445 : Gamma-ray loud blazars optical monitoring. II. (Raiteri+ 1998)
J/A+AS/130/109 : BV(RI)c photometry of ON 231 (Tosti+ 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJDst [2450928/2451515] Starting Julian date (1)
15- 26 F12.4 d HJDend [2450928/2451515] Ending Julian date (1)
29 A1 --- Band [BR] Standard Johnson spectral band
32- 37 F6.3 mag magmax Maximum of the brightness (2)
40- 45 F6.3 mag magmin Minimum of the brightness (2)
48- 50 I3 --- o_mag Number of measurements (3)
53- 57 F5.3 mag e_mag rms uncertainty on the object magnitude
60- 64 F5.3 mag rmsche rms uncertainty on the check star magnitude
67- 72 F6.3 mag mag Average object magnitude during the
observational run
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Note (1): Heliocentric Julian date at the start and end of the observational run
on this night
Note (2): Brightest and faintest apparent magnitude during the observational run
on this night
Note (3): Number of individual brightness measurements during the observational
run
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Acknowledgements: Elena Belokon
(End) Patricia Bauer [CDS] 04-Apr-2000