W Hydrae

{{Short description|Variable star in the constellation Hydra}}

{{Starbox begin

| name = W Hydrae

}}

{{Starbox image

| image = 250px

| caption = The visual band light curve of W Hydrae, from AAVSO data

}}

{{Starbox observe

| epoch = J2000.0

| constell = Hydra

| ra={{RA|13|49|01.998}}

| dec={{DEC|-28|22|03.49}}

| appmag_v = 7.7 - 11.6{{cite web |title=GCVS Query=W Hya |publisher=General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia |url=http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=W+Hya |access-date=2012-08-22}}

}}

{{Starbox character

| class = M7.5e-M9ep{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

| appmag_1_passband = J

| appmag_1 = -1.7{{cite web |title=V* W Hya |publisher=SIMBAD Astronomical Database |url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=V*+W+Hya |access-date=2012-08-21}}

| r-i =

| v-r =

| b-v =

| u-b =

| variable = Mira

}}

{{Starbox astrometry

| parallax = 10.18

| p_error = 2.36

| parallax_footnote = {{cite journal|arxiv=astro-ph/0305405|doi=10.1051/0004-6361:20030766|title=VLBI astrometry of circumstellar OH masers: Proper motions and parallaxes of four AGB stars|year=2003|last1=Vlemmings|first1=W. H. T.|last2=Van Langevelde|first2=H. J.|last3=Diamond|first3=P. J.|last4=Habing|first4=H. J.|last5=Schilizzi|first5=R. T.|journal=Astronomy & Astrophysics|volume=407|pages=213–224|bibcode=2003A&A...407..213V|s2cid=11505142}}

| dist_pc = {{val|98|30|18}}

| dist_ly = {{val|{{convert|98|pc|ly|disp=number}}|{{convert|30|pc|ly|disp=number}}|{{convert|18|pc|ly|disp=number}}}}

| dist_footnote =

}}

{{Starbox detail

| mass = {{val|2.14|1.07|0.71}}

| radius = {{solar radius calculator|type=AD|41.4|0.098}}{{±|134|80}}{{Efn|name=radius}}

| luminosity = {{val|9290|2460|1940|fmt=commas}}

| temperature = 3,000

}}

{{Starbox catalog

| names = W Hya, CCDM J13491-2822A, HD 120285, RAFGL 1650, CPD-27° 4792, HIP 67419, SAO 181981, AAVSO 1343-27, IRAS 13462-2807, GC 18659, TYC 6728-19-1.

}}

{{Starbox reference

|Simbad=W+Hya

}}

{{Starbox end}}

W Hydrae is a Mira-type variable star in the constellation Hydra.

The star is nearly located within the Solar neighborhood, at 320 light years from the Solar System. It has a visual apparent magnitude range of 5.6 to 10. In the near-infrared J band it has a magnitude of -1.7, is the 7th brightest star in the night sky, and is even brighter than Sirius.