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Details for Revision 3
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Name
  W Hya  
AAVSO UID
000-BBT-975 (5353 observations)  
Constellation
Hydra Sequence
J2000.0
13 49 02.00 -28 22 03.5  (207.25833 -28.36764) Search nearby
B1950.0 13 46 12.03 -28 07 09.7
Galactic coord. 318.022 +32.811
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 1343-27 ASAS J134902-2822.1 CD-27 9429
CPD-27 4792 HD 120285 HIP 67419
IRC -30207 PPM 262109 RAFGL 1650
SAO 181981 SSS_J134901.4-282930 SSS_J134901.5-282836
SSS_J134902.0-283228 SSS_J134902.4-283037 TYC 6728-19-1
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Variability type
M
Spectral type M7e-M9ep
Mag. range
5.6 - 9.6 V
Discoverer --
Epoch
30 Dec 2007 (HJD 2454465) Ephemeris
Outburst --
Period 390 d
Rise/eclipse dur. 50%  (195 d)
Remarks
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1 Otero, Sebastian Alberto 2 mag. mean mag. changes on a time scale of 8000 days.
2 GCVS Team VB A (B 9.3m, 72", 108deg). P var. Max = 2411074 + 379d*E (JD2411000 - 14150); Max = 2414644 + 395d*E (JD2414150 - 19400); Max = 2419746 + 378d*E (JD2419400 - 25200) [R.Prager, GuL 2, 1936.]. Max = 2425740 + 366d*E (JD2425200 - 27000); Max = 2440336 + 397.35d*E (JD2428000 - 40500); since JD2440500 - see Table. Amplitude and shape of the light curve vary strongly. OH, H2O, SiO maser.
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References
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1 Drake, A. J.; et al., 2017, The Catalina Surveys Southern Periodic Variable
Catalog		 2017MNRAS.469.3688D
2 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
3 Cannon, A. J., 1907, Second catalogue of variable stars 1907AnHar..55....1C
4 General Catalogue of Variable Stars, 4th Edition, Volumes I-III, P.N.
Kholopov et al.		 --
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Supporting Documents
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Revision History
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5 Otero, Sebastian Alberto 2024-01-19 01:38 UTC Period from AAVSO data.
4 Fernig, Leo 2022-04-22 13:32 UTC Discoverer updated from 1907AnHar..55....1C page 17
3 Otero, Sebastian Alberto 2012-05-05 00:53 UTC Type, period and epoch from ASAS-3 data. Range 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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