Variable Star Index
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000-BCK-377 (8349 observations)
20 04 18.54 -55 43 33.2 (301.07725 -55.72589)
20 00 20.18 -55 52 02.9
RA: 0.290 +/- 0.829 mas/y
Dec: -3.284 +/- 1.513 mas/y
Please note that aliases shown in grey link to obsolete records.
Downes RR Tel
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6.5 - 16.5 p
Fleming, Kirchoff, de Kock
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During 1889 - 1930 12m - 14m pg (according to [
M.W.Mayall, HB N919, 1949.
], irregular variations; according to [
C.H.Payne, HB N861, 1928.
], Max = 2411490 + 384d*E, with irregularities). During 1930 - 1944 12.5m - 16.5m pg, Max = 2430145 + 386.73d*E [
C.Payne-Gaposchkin, HA 113, N4, 1954.
]; after 1938 an increase of mean brightness and of the amplitude was noted. An outburst from 14m to 7m in October, 1944. In Max, 6.5m - 7.5m pg, during JD2431500 - 33000; after JD2433100 began to decline its mean brightness. Near the Max of the outburst no periodic variations was noted. During JD2441426 - 44899 5.06m - 6.74m J, P = 387d [
M.W.Feast, P.A.Whitelock, R.M. Catchpole, G.Roberts, B.S.Carter, MN 202, N3, 951, 1983.
], M - m = 0.5P; Min (V) = 2442551 + 374.2d*E (1961 - 1981), Delta(V) = 0.25m for periodic changes [
S.J.Kenyon, F.M.Bateson, PASP 96, 321, 1984.
]; 9.8m - 10.7m B, P = 395d (JD2443500 - 45500) [
A.Heck, J.Manfroid, AsAp 142, N2, 341, 1985.
]. In the Max of the outburst the spectrum was F5 without emissions. During the brightness decline a rich emission spectrum was formed with lines of hydrogen, forbidden lines of metals in high stages of ionization, etc. Since the 1970-ies TiO absorption bands are being noted. Radio source, soft X-ray source.
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R.A.Downes, 2001, PASP 113, 764 (2006 archival)
R.A.Downes, 2001, PASP 113, 764
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Kamogata Wide-field Survey (KWS)
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Information from selected catalogs obtained by cross-matching to 2 arc seconds using the
CDS X-Match Service
. These data may not be complete.
J = 7.30
H = 6.08
K = 4.90
J - K = 2.40
W1 = 3.41
W3 = 0.41
W4 = -0.62
W3 - W4 = 1.03
B = 12.13
V = 11.80
g' = 11.76
r' = 11.45
i' = 11.91
B - V = 0.33
FUV = 12.43
NUV = 13.23
FUV - NUV = -0.80
Please review Digitized Sky Survey
5' x 5' (297 x 298 pixels)
20 04 18.54 -55 43 33.2 (J2000)
HST Phase 2 (GSC2)
HST Phase 2 (GSC1)
Red, all sky, 1.0 arcsec/pixel
There are currently no supporting documents on file for this star.
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2010-01-04 23:43 UTC
Position updated from the GCVS version of November 2009.
2007-03-23 15:52 UTC
2005-12-17 20:33 UTC
Initial database population.
The International Variable Star Index
© 2005-2017 American Association of Variable Star Observers (AAVSO)
Version 1.1 [C]