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Name
  EX Hya  
AAVSO UID
000-BBT-323 (52025 observations)  
Constellation
Hydra Sequence
J2000.0
12 52 24.22 -29 14 56.0  (193.10092 -29.24889) Search nearby
B1950.0 12 49 42.74 -28 58 40.0
Proper motion
RA: -122.8 +/- 2.7 mas/yDec: 29.7 +/- 1.0 mas/ySource: UCAC4
Galactic coord. 303.185 +33.622
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
1RXS J125224.7-291451 2MASS J12522423-2914560 AAVSO 1247-28
Downes EX Hya GSC 06709-00694 HV 10215
X 12492-289    
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Variability type
UG/DQ+E
Spectral type WD+M5-6V
Mag. range
10.0 - 14.3 V
Discoverer --
Epoch
--
Outburst --
Period 0.068234 d  (98.257 min)
Rise/eclipse dur. --
Remarks
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1 2009arXiv0910.0954S White dwarf spin period = 4021.62 seconds.
2 GCVS Team Light variations with Porb and amplitude up to 0.9mV due to eclipses of hot spot are represented by the elements: ET(Min) = 2437699.94177 + 0.0682338422d*E, where ET(Min) is the heliocentric Julian Date converted to Ephemeris Time; simultaneously periodic modulation of the shape of the light curve between the outbursts is observed with the amplitude 0.2m - 0.9m and the elements: Max = 2437699.8895 + 0.04654656d*E - 1.2d*10**(-12)*E**2 [C.Sterken, N.Vogt, R.Freeth, H.D. Kennedy, B.F.Marino, A.A.Page, W.S.G.Walker, AsAp 118, 325, 1983.]. Mean interval between bright outbursts is 465d [F.M.Bateson, A.F.Jones, B.Menzies, NZ Circ N159, 1970.], mean cycle is close to 20 - 30d.
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References
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1 S. Scaringi et al., 2009, arXiv:0910.0954v1 [astro-ph.GA] 2009arXiv0910.0954S
2 Outbursts of EX Hydrae revisited 2007MNRAS.380..353M
3 R.A.Downes, 2001, PASP 113, 764 (2006 archival) 2005JAD....11....2D
4 D.W. Hoard, The Big List of SW Sextantis Stars 2003AJ....126.2473H
5 Catalogue of Stellar Spectral Classifications (Skiff, 2005) 2002A&A...382..984E
6 R.A.Downes, 2001, PASP 113, 764 2001PASP..113..764D
7 N.Vogt, F.M.Bateson, AsAp Suppl 48, N3, 383, 1982. 1982A&AS...48..383V
8 K. Mukai, The Intermediate Polars --
9 F.M.Bateson, A.F.Jones, B.Menzies, NZ Circ N159, 1970. --
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Supporting Documents
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Campaigns/Programs
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Revision History
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4 Otero, Sebastian Alberto 2011-05-17 20:10 UTC Primary record creation. Orbital period and spectral type from Ritter and Kolb (2010, 2003A&A...404..301R). Range from AAVSO data. Type from reference. UCAC3 position.
3 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
2 Admin, VSX 2009-10-08 22:29 UTC Orbital period from [2009arXiv0910.0954S].
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.