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Latest Details
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Name
  R Hya  
AAVSO UID
000-BBT-665 (27419 observations)  
Constellation
Hydra Sequence
J2000.0
13 29 42.78 -23 16 52.8  (202.42825 -23.28133) Search nearby
B1950.0 13 26 58.52 -23 01 24.7
Proper motion
RA: -57.68 +/- 0.92 mas/yDec: 12.86 +/- 0.51 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 314.223 +38.750
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 1324-22 ADS 8920 A ASAS J132943-2316.9
BD-22 3601 CD-22 9961 HD 117287
HIP 65835 HR 5080 IRC -20254
RAFGL 1627 SAO 181695  
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Variability type
M
Spectral type M6e-M9eS(Tc)
Mag. range
3.5 - 10.9 V
Discoverer Montanari (1672), Maraldi (1704)
Epoch
17 Sep 2020 (HJD 2459110): Ephemeris
Outburst --
Period 359 d
Rise/eclipse dur. 49%  (176 d)
Remarks
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 Otero, Sebastian Alberto Period keeps shortening. 2017-2022 = 359 d.
2 Otero, Sebastian Alberto Period keeps shortening. 1965-1992 = JD 2442062 + 386.2 x E. 1997-2011 = JD 2452863 + 380 x E.
3 GCVS Team VB A (B 13.0m, 21.6", 324deg). SiO maser. P var. According to [R.Prager, GuL 2, 1936.]; Max = 2328201 + 486d*E (JD2328200 - 31120); Max = 2343512 + 507d*E (JD2343300 - 44800); Max = 2372678 + 485d*E (JD2372200 - 72700); Max = 2380447 + 477d*E (JD2380000 - 81400); Max = 2385160 + 461d*E (JD2384700 - 88000); Max = 2394350 + 448.6d*E (JD2393900 - 2402000); Max = 2403742 + 434d*E (JD2403300 - 04200); Max = 2406363 + 429.5d*E (JD2406000 - 11100); Max = 2413642 + 411d*E (JD2413200 - 14100); Max = 2416563 + 405.5d*E (JD2416100 - 23400); Max = 2424288 + 414.7d*E (JD2423400 - 28500). since JD2428500 - see Table.
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References
Click reference title/citation to view in new window. Roll over index number to view submission details.
1 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
2 W. Ceraski, 1908, Nouvelles de la Science, Variétés 1908BSAFR..22..241C
3 T. Karlsson, Maxima of Mira stars --
4 General Catalogue of Variable Stars, 4th Edition, Volumes I-III, P.N.
Kholopov et al.
--
External Links
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Location    Go   
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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 = -1.31H = -2.23K = -2.66J - K = 1.35
AllWISE W4 = -3.50
APASS-DR9 B = 9.65V = 7.91g' = 10.07B - V = 1.75
GALEX-DR5 NUV = 17.75
Images
Please review Digitized Sky Survey Acknowledgment and Copyright.
Size 5' x 5' (297 x 298 pixels)
Center 13 29 42.78 -23 16 52.8 (J2000)
Source STScI
Survey

Red, all sky, 1.0 arcsec/pixel
  Negative
Supporting Documents
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2 Phase plot Otero, Sebastian Alberto 2011-06-09 01:23 UTC Phase plot with observations between 1965 and 1992 showing a period of 386.6 d, almost 7 days longer than the current one.
1 Phase plot Otero, Sebastian Alberto 2011-06-09 01:21 UTC Phase plot with the current period for R Hya including only observations from 1997 onwards.
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Campaigns/Programs
 Binocular program
 Legacy LPV Program
 LPV Program
 LPV Humps
 Percy's Unusual LPVs
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
5 Otero, Sebastian Alberto 2022-07-29 18:32 UTC Period and epoch from AAVSO data.
4 Billiaert, Bruno 2015-12-29 23:25 UTC discoverers added (1908BSAFR..22..241C)
3 Otero, Sebastian Alberto 2011-06-09 01:21 UTC Period and epoch from ASAS-3 data and photometric compilation.
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.