Variable Star Index
Welcome, Guest. You are not logged in.
Log in to retrieve additional aliases from SIMBAD.
000-BCK-377 (8360 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
(Not logged in)
6.5 - 16.5 p
Fleming, Kirchoff, de Kock
Some references may be clicked to view in new window. Roll over index number to view submission details.
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.
(Not logged in)
Click reference title/citation to view in new window. Roll over index number to view submission details.
R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version)
R.A. Downes et al., 2001, PASP 113, 764
Links open in a new window. Not all links may be valid for this particular target.
-- Select --
AAVSO Variable Star Plotter
AAVSO Light Curve
SIMBAD Clickable Map
SIMBAD Coordinate query
Aladin Java Applet
SDSS Navigate Tool
ASAS-SN Sky Patrol
ASAS Light Curve
Kamogata Wide-field Survey (KWS)
for more details.
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.
(Not logged in)
Currently approved revision is checked. Click revision number to view details of that revision.
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
© 2005-2018 American Association of Variable Star Observers (AAVSO)
Version 1.1 [C]