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Name
  U Lac  
AAVSO UID
000-BCQ-745 (556 observations)  
Constellation
Lacerta Sequence
J2000.0
22 47 43.43 +55 09 30.3  (341.93096 +55.15842) Search nearby
B1950.0 22 45 39.76 +54 53 39.0
Proper motion
RA: -3.333 +/- 0.054 mas/yDec: -3.039 +/- 0.052 mas/ySource: Gaia DR1
Galactic coord. 105.822 -3.550
Other names

(Internal only)
AAVSO 2243+54 AN 2.1902 BD+54 2863
HD 215924 HIP 112545 IRC +50446
RAFGL 2957    
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Variability type
SRC
Spectral type M4epIab+B
Mag. range
9.4 - 12.1 p
Discoverer --
Epoch
--
Outburst --
Period --
Rise/eclipse dur. --
Remarks
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1 Huziak, Richard The "Original Reference" (S.Gaposchkin, HA 118, N26, 1952) for U Lac cited in VSX (and thus in the GCVS) is incorrect for U Lac, and no reference to U Lac is seen in that publication. T. W. Backhouse states in "Astronomische Nachrichten" (1902AN....158..383K) that the star AN 2.1902 (now U Lac) was announced in "The Observatory for Jul 1897 p.278" and was discovered by him as variable, and that the star was first listed in Espin's revision of "Birmingham's Catalogue of Red Stars" as #735.
2 GCVS Team There are light variations with the periods: 150d, 550 - 690d, 2900d.
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References
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1 S.Gaposchkin, HA 118, N26, 1952. 1952AnHar.118...25G
2 N.F.Florja, Tr. Gos. Astron. Inst. Sternberg 16, 187, 1949. 1949TrSht..16..187F
External Links
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Location    Go   
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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 = 3.81H = 2.67K = 1.93J - K = 1.88
AllWISE W3 = -0.89W4 = -1.92W3 - W4 = 1.04
APASS-DR9 B = 11.15V = 8.89g' = 10.46r' = 7.86i' = 6.19B - V = 2.26
Images
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Supporting Documents
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Stellar Association Membership
 ASCC 123 Open Cluster 2012A&A...548A..97Z
Revision History
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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.