CHXR 73

{{Short description|Star in the constellation Chamaleon}}

{{Starbox begin}}

{{Starbox image

| image = 250px

| caption = HST image of CHXR 73 and its companion

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{{Starbox observe

| epoch = J2000.0

| constell = Chamaeleon

| ra = {{RA|11|06|28.7626}}

| dec = {{DEC|−77|37|33.1444}}

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{{Starbox character

| class = M3{{cite encyclopedia|url=https://exoplanet.eu/catalog/chxr_73_b--833/|encyclopedia=Extrasolar Planets Encyclopaedia|title=Notes on CHXR 73 b|access-date=24 December 2016}}

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{{Starbox astrometry

| radial_v =

| prop_mo_ra = {{val|−22.193|0.233}}

| prop_mo_dec = {{val|0.215|0.206}}

| parallax = 5.2343

| p_error = 0.1759

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| source={{cite journal|bibcode=2013A&A...554A..43D|doi=10.1051/0004-6361/201321220|arxiv=1304.1150|title=Protoplanetary disk evolution and stellar parameters of T Tauri binaries in Chamaeleon I|journal=Astronomy & Astrophysics|volume=554|pages=A43|year=2013|last1=Daemgen|first1=S.|last2=Petr-Gotzens|first2=M. G.|last3=Correia|first3=S.|last4=Teixeira|first4=P. S.|last5=Brandner|first5=W.|last6=Kley|first6=W.|last7=Zinnecker|first7=H.|s2cid=59440639}}

| temperature=3490 ± 180

| luminosity=0.09 ± 0.07

| age_myr=2{{±|1}}

| mass=0.32 ± 0.11

| radius=0.83 ± 0.04

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{{Starbox catalog

| names = 2MASS J11062877-7737331

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{{Starbox reference

| Simbad = CHXR+73

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{{Starbox end}}

CHXR 73 is a star in the constellation Chamaeleon, about 620 light-years away from Earth.{{cite news|title= Newfound Object Further Blurs Planet Definition |url=http://www.space.com/2858-newfound-object-blurs-planet-definition.html |publisher=Space.com |accessdate=13 November 2016}}

The star is located within Cha I, a molecular cloud. It has a low temperature of 3,490 K typical of red dwarfs, but unlike typical red dwarfs it has an unusually large radius of {{solar radius|0.83}}—this is because of its young age, only 8 million years.