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  AC Her  
000-BCC-490 (40086 observations)  
Hercules Sequence
18 30 16.20 +21 52 01.0  (277.56750 +21.86694) Search nearby
B1950.0 18 28 09.00 +21 49 53.0
Galactic coord. 50.493 +14.242
Other names

(Internal only)
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AAVSO 1826+21 ASAS J183016+2152.0 BD+21 3459
HD 170756 HIP 90697 HV 3588
SAO 86134    
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Variability type
Spectral type F2pIb-K4e(C0,0)
Mag. range
6.85 - 9 V
Discoverer --
21 Dec 1954 (HJD 2435097.8) Ephemeris
Outburst --
Period 75.01 d
Rise/eclipse dur. --
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1 GCVS Team P var. The Table gives current elements valid since JD2442000. Mean P = 75.4619d [V.P.Zessewitsch, Astron. Tsirk. N128, 1952.]. The magnitude in Max varies with Delta(m) = 1.6m [C.Payne-Gaposchkin, V.K.Brenton, S.Gaposchkin, HA 113, N1, 1943.].
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Click reference title/citation to view in new window. Roll over index number to view submission details.
1 Beobachtungen veranderlicher Sterne Trudy Tashkentskoj Astronomicheskoj Observatorii, vol. 1, pp.33-86
2 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
3 M.Nakagiri, Y.Yamashita, Tokyo Bull, ser. II, N260, 1979. 1979IBVS.1565....1N
4 C.Payne-Gaposchkin, V.K.Brenton, S.Gaposchkin, HA 113, N1, 1943. 1943AnHar.113....1P
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 Binocular program
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
4 Billiaert, Bruno 2015-03-18 20:40 UTC added paper by Zacharov, G.
3 Otero, Sebastian Alberto 2011-06-28 23:27 UTC Period and epoch from ASAS-3 data.
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.