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Name
  AC Her  
AAVSO UID
000-BCC-490 (51045 observations)  
Constellation
Hercules Sequence
J2000.0
18 30 16.20 +21 52 01.0  (277.56750 +21.86694) Search nearby
B1950.0 18 28 09.05 +21 49 53.6
Galactic coord. 50.493 +14.242
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 1826+21 ASAS J183016+2152.0 BD+21 3459
HD 170756 HIP 90697 HV 3588
SAO 86134    
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Variability type
RVA
Spectral type F2pIb-K4e(C0,0)
Mag. range
6.85 - 9 V
Discoverer --
Epoch
21 Dec 1954 (HJD 2435097.8) Ephemeris
Outburst --
Period 75.01 d
Rise/eclipse dur. --
Remarks
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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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References
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1 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
2 M.Nakagiri, Y.Yamashita, Tokyo Bull, ser. II, N260, 1979. 1979IBVS.1565....1N
3 C.Payne-Gaposchkin, V.K.Brenton, S.Gaposchkin, HA 113, N1, 1943. 1943AnHar.113....1P
4 Beobachtungen veranderlicher Sterne, Trudy Tashkentskoj Astronomicheskoj
Observatorii, vol. 1, pp.33-86
1928TrTas...1...33Z
5 Hartwig, E., 1922, Benennung von neu entdeckten veraenderlichen Sternen 1922AN....215..185H
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Supporting Documents
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Campaigns/Programs
 Binocular program
Revision History
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5 Fernig, Leo 2023-03-29 20:26 UTC Discoverer updated from 1922AN....215..185H page 192.
4 Billiaert, Bruno 2015-03-19 00:40 UTC added paper by Zacharov, G.
3 Otero, Sebastian Alberto 2011-06-29 03:27 UTC Period and epoch from ASAS-3 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.