TY Pyxidis

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

{{Starbox begin

| name=TY Pyxidis

}}

{{Starbox image

| image = 250px

| caption = A light curve for TY Pyxidis, plotted from TESS data

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|08|59|42.72169}}

| dec = {{DEC|–27|48|58.6885}}

| appmag_v = 6.85 - 7.5

| constell = Pyxis

}}

{{Starbox character

| class = G5IV + G5IV

| b-v =

| u-b =

| variable = RS Canum Venaticorum variable

}}

{{Starbox astrometry

| radial_v = +63.20 ± 1

| prop_mo_ra = –44.46 ± 0.34

| prop_mo_dec = –44.36 ± 0.42

| parallax = 17.73

| p_error = 0.52

| parallax_footnote = {{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 | s2cid=18759600 }}

| absmag_v =

}}

{{Starbox detail

| mass =

| radius = 2.2{{cite journal|title=Starspots|author=Strassmeier, Klaus G.|date=2009|journal=The Astronomy and Astrophysics Review|volume=17|issue=3|pages=251–308 | doi=10.1007/s00159-009-0020-6

|bibcode=2009A&ARv..17..251S|doi-access=free}}

| luminosity =

| temperature = 5400

| metal_fe =

| rotation =

| rotational_velocity =

| gravity =

| age =

}}

{{Starbox catalog

| names= TY Pyxidis, CD−27° 6141, HD 77137, HIP 44164, SAO 176805.

}}

{{Starbox reference

| Simbad = TY+Pyx

}}

{{Starbox end}}

TY Pyxidis is an eclipsing binary star in the constellation Pyxis. The apparent magnitude ranges from 6.85 to 7.5 over 3.2 days.{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=27245 |title=TY Pyxidis |author =Watson, Christopher |date=4 January 2010 |work=The International Variable Star Index|publisher=American Association of Variable Star Observers|accessdate=30 July 2015}}

The two components are both of spectral type G5IV, have a mass of 1.2 solar masses and revolve around each other every 3.2 days.{{cite journal | title=The G-type eclipsing binary TY Pyxidis. | last1=Andersen |first1 =J. |last2=Popper |first2=D. M. |date=1975 |journal=Astronomy and Astrophysics |volume= 39 |pages= 131–34 |bibcode=1975A&A....39..131A |url=http://adsabs.harvard.edu/full/1975A%26A....39..131A }} Each star is around 2.2 times the diameter of the Sun.

The system is classified as either a RS Canum Venaticorum variable or a BY Draconis variable, stars that vary on account of prominent starspot activity, and lies 184 ± 5 light years away. The system emits X-rays, and analysing the emission curve over time led Pres and colleagues to conclude that there was a loop of material arcing between the two stars.{{cite journal|author1=Pres, Pawel |author2=Siarkowski, Marek |author3=Sylwester, Janusz |date=1995|title=Soft X-ray imaging of the TY Pyx binary system - II. Modelling the interconnecting loop-like structure|journal=Monthly Notices of the Royal Astronomical Society|volume=275|issue=1|pages=43–55|bibcode=1995MNRAS.275...43P|doi = 10.1093/mnras/275.1.43 |doi-access=free}}