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Latest Details
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Name
  eps UMa  
AAVSO UID
000-BBT-343 (1616 observations)  
Constellation
Ursa Major Sequence
J2000.0
12 54 01.75 +55 57 35.4  (193.50729 +55.95983) Search nearby
B1950.0 12 51 50.12 +56 13 51.5
Proper motion
RA: 111.91 +/- 0.23 mas/yDec: -8.24 +/- 0.19 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 122.180 +61.165
Other names

(Internal only)
77 UMa AAVSO 1249+56 BD+56 1627
HD 112185 HIP 62956 HR 4905
IRC +60222 RAFGL 1584 SAO 28553
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Variability type
ACV
Spectral type A0p(Cr-Eu)
Mag. range
1.75 - 1.78 V
Discoverer --
Epoch
13 Apr 1974 (HJD 2442150.778) Ephemeris
Outburst --
Period 5.088631 d
Rise/eclipse dur. --
Remarks
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1 GCVS Team SB (P=4.15A). Interferometric binary? (0.053", 94.5deg, 1975.4). In 1976 - 1983 attempts to resolve the binary interferometrically were not successful. In the UMa moving cluster; mu alpha = +0.0131s, mu delta = -0.010".
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References
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1 Modelling the light variability of the Ap star epsilon Ursae Majoris 2010A&A...524A..66S
2 P.Guthnick, Sitzb Akad Berlin 30, 506-528, 1934. --
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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 = 1.71H = 1.70K = 1.62J - K = 0.09
AllWISE W3 = 1.97W4 = 1.75W3 - W4 = 0.23
Images
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Supporting Documents
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Revision History
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3 Otero, Sebastian Alberto 2010-11-30 05:12 UTC Revised period, Epoch and V-amplitude.
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.