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  U Del  
000-BCM-398 (50979 observations)  
Delphinus Sequence
20 45 28.24 +18 05 24.1  (311.36767 +18.09003) Search nearby
B1950.0 20 43 10.84 +17 54 26.0
Proper motion
RA: 9.81 +/- 0.63 mas/yDec: -9.36 +/- 0.47 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 62.981 -15.200
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 2040+17 ASAS J204528+1805.4 BD+17 4401
HD 197812 HIP 102440 HR 7941
IRC +20481 RAFGL 2641 SAO 106458
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Variability type
Spectral type M5II-III
Mag. range
6.14 - 7.61 V
Discoverer --
22 Jun 2008 (HJD 2454640) Ephemeris
Outburst --
Period 120 d
Rise/eclipse dur. --
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 Otero, Sebastian Alberto Long Secondary Period (LSP) is 1163 d.
2 GCVS Team Mean brightness var, P = 1100d. According to [P.Ralincourt, GEOS NC 242, 1980.], the period value 160d - 180d is more likely than 110d.
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Click reference title/citation to view in new window. Roll over index number to view submission details.
1 Period Analysis of the Light Curves of Three Semiregular Variables: AA
Cygni, U Delphini, and RX Bootis
2 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
3 S.Rucinski, Urania 33, N4, 116, 1962. --
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 1.03H = -0.02K = -0.21J - K = 1.24
AllWISE W3 = -1.18W4 = -2.29W3 - W4 = 1.11
APASS-DR9 B = 8.79V = 7.35B - V = 1.44
GALEX-DR5 FUV = 20.71NUV = 17.07FUV - NUV = 3.65
Please review Digitized Sky Survey Acknowledgment and Copyright.
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Supporting Documents
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1 Phase plot Otero, Sebastian Alberto 2011-06-09 04:37 UTC Phase plot of the LSP (Long Secondary Period) variations combining Hipparcos and ASAS-3 data.
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 Binocular program
 Legacy LPV Program
 LPV Program
Revision History
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3 Otero, Sebastian Alberto 2011-06-09 04:37 UTC Period and epoch from ASAS-3 data. LSP period from Speil (2006) and ASAS-3 and Hipparcos data.
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.