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Name
  eps Aur  
AAVSO UID
000-BCT-905 (38309 observations)  
Constellation
Auriga Sequence
J2000.0
05 01 58.13 +43 49 23.9  (75.49221 +43.82331) Search nearby
B1950.0 04 58 22.53 +43 45 05.4
Proper motion
RA: -0.86 +/- 1.38 mas/yDec: -2.66 +/- 0.75 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 162.788 +1.179
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
7 Aur AAVSO 0454+43 ADS 3605 A
ASASSN-V J050159.29+435345.9 ASASSN-V J050200.51+435101.9 ASASSN-V J050202.42+434720.2
Almaaz BD+43 1166 HD 31964
HIP 23416 HR 1605 IRC +40109
RAFGL 670S SAO 39955  
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Variability type
E-DO/GS+SRD
Spectral type A8Ia-F2epIa+BV
Mag. range
2.92 - 3.83 V
Discoverer Johann Heinrich Fritsch (1821)
Epoch
04 Jun 1956 (HJD 2435629) Ephemeris
Outburst --
Period 9892 d  (27.08 y)
Rise/eclipse dur. 7.6%  (107 weeks)
Remarks
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1 GCVS Team VB A (B 14.0m, 21", 224deg). d = 0.037P. Survey of the physical properties of the system [O.Struve, PASP 68, 27, 1956., K.O.Wright, JRAS Can 49, 221, 1955., H.A.Abt, ApJ 126, 138, 1957., I.M.Kopylov, R.N.Kumajgorodskaya, Izv. Krymsk. Astrofiz. Obs. 29, 251, 1963., M.Hack, Mem SAIt 32, F.4, 1961==Milano-Merate Contr N185, 1962., Kh.Albo, Tartu Publ 45, 284, 1977.]. The spectrum probably varies even outside eclipses. The eclipses are probably due to a disk of gas and dust surrounding the hot companion. The brightness has physical fluctuations with the amplitude up to 0.24m and the cycle about 110d [C.M.Huffer, ApJ 76, 1, 1932.] which hinder revealing the possible Min II. Similar cycle was discovered also in the fluctuations of Vr.
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References
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1 T. Jayasinghe, K. Z. Stanek, C. Kochanek, et al., 2019 (in preparation) --
2 Zhou, G.; Rappaport, S.; Nelson, L.; et al., 2018, Occultations from an
Active Accretion Disk in a 72-day Detached Post-Algol System Detected by K2		 2018ApJ...854..109Z
3 Kh.Albo, Tartu Publ. 39, 82, 1971. --
4 Fritsch, J. H., 1824, Berliner Astronomisches Jahrbuch, p. 252 --
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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 = 1.88H = 1.70K = 1.53J - K = 0.35
AllWISE W3 = 1.72W4 = 1.38W3 - W4 = 0.35
Images
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Supporting Documents
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Revision History
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4 Riesen, Peter 2025-07-16 08:39 UTC Discoverer from Berliner Astronomisches Jahrbuch, p. 252.
3 Otero, Sebastian Alberto 2024-06-28 03:29 UTC Type from 2018ApJ...854..109Z. Eclipse duration from AAVSO data.
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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