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Name
  eta Ori  
AAVSO UID
000-BBJ-259 (806 observations)  
Constellation
Orion Sequence
J2000.0
05 24 28.62 -02 23 49.7  (81.11925 -2.39714) Search nearby
B1950.0 05 21 57.68 -02 26 29.7
Proper motion
RA: -0.71 +/- 1.13 mas/yDec: -3.46 +/- 0.85 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 204.866 -20.392
Other names

(Internal only)
28 Ori 1RXS J052429.7-022403 AAVSO 0519-02
ADS 4002 A BD-02 1235 HD 35411
HIP 25281 HR 1788 SAO 132071
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Variability type
EA+BCEP:
Spectral type B0.5Vea+B3V
Mag. range
3.31 - 3.6 V
Discoverer --
Epoch
12 Jan 1902 (HJD 2415761.826) Ephemeris
Outburst --
Period 7.989268 d
Rise/eclipse dur. --
Remarks
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1 GCVS Team VB Aab (AC 0.037", 111deg, 1979.0, P = 9.219 yr [E.R.Zizka, W.R.Beardsley, AJ 86, N12, 1944, 1981.]; B 4.8m, 1.60", 76deg, 1976.0; C 9.4m, 115", 51deg). EA/DM. Min II 3.57. The range of combined light variation of the components AAb (SB 2, P = 7.989268d), AC, and B is given in the Table. Outside eclipses there are sinusoidal light variations of the system with A(V) = 0.05m due to pulsations of the component Ab [E.R.Zizka, W.R.Beardsley, AJ 86, N12, 1944, 1981.] with P = 0.30197d [R.H.Koch, B.J.Hrivnak, D.H.Bradstreet, BAAS 12, 452, 1980.] or 0.30145d [C.Waelkens, F.Rufener, AsAp 121, 45, 1983.]. According to [R.R.Shobbrook, MN 184, 43, 1978.] these variations were not observed between 1970 and 1976.
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References
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1 R.H.Koch, IBVS N1418, 1978. 1978IBVS.1418....1K
2 W.H.Warren, Jr., J.E.Hesser, ApJ Suppl 34, 115, 1977. 1977ApJS...34..115W
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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 = 3.97H = 4.00K = 3.90J - K = 0.07
AllWISE W1 = 3.98W2 = 3.73W3 = 4.05W4 = 4.05W1 - W2 = 0.25W3 - W4 = 0.01
Images
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Supporting Documents
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Stellar Association Membership
 ASCC 19 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.