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Latest Details
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Name
  V0490 Cep  
AAVSO UID
000-BDL-540 (35 observations)  
Constellation
Cepheus Sequence
J2000.0
21 39 30.69 +56 59 10.4  (324.87788 +56.98622) Search nearby
B1950.0 21 37 56.18 +56 45 32.9
Proper motion
RA: -3.4 +/- 4.3 mas/yDec: -6.5 +/- 4.1 mas/ySource: UCAC4
Galactic coord. 99.012 +3.313
Other names

(Internal only)
1H 2138+579 2MASS J21393068+5659104 AAVSO_DES 2136+56
CEP X-4 X-4 CEP  
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Variability type
HMXB/XP
Spectral type B1/2Ve
Mag. range
15.2 - 15.8 B
Discoverer --
Epoch
--
Outburst --
Period 20.85: d
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Pulse period 66.3 seconds.
2 Otero, Sebastian Alberto V= 14.3
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References
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1 On the cyclotron line in Cepheus X-4 2007A&A...470.1065M
2 Catalogue of high-mass X-ray binaries in the Galaxy (4th edition) 2006A&A...455.1165L
3 V.P.Goranskij, Private communication, 1997. --
External Links
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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 = 11.83H = 11.41K = 10.93J - K = 0.90
AllWISE W1 = 10.44W2 = 10.07W3 = 9.15W4 = 7.90W1 - W2 = 0.36W3 - W4 = 1.26
APASS-DR9 B = 15.41V = 14.44g' = 14.94r' = 13.91i' = 13.37B - V = 0.97
Images
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Supporting Documents
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Stellar Association Membership
 Trumpler 37 Open Cluster 2012A&A...548A..97Z
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
5 Otero, Sebastian Alberto 2011-05-23 21:14 UTC Orbital period and type from reference.
4 Otero, Sebastian Alberto 2011-05-23 08:35 UTC Type from reference.
3 Otero, Sebastian Alberto 2011-05-19 23:21 UTC Primary record creation. Spectral type from Skiff (2010). UCAC3 position.
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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