TY Pyxidis

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.^[3]

TY Pyxidis

A light curve for TY Pyxidis, plotted from TESS data[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Pyxis
Right ascension	08h 59m 42.72169s[2]
Declination	–27° 48′ 58.6885″[2]
Apparent magnitude (V)	6.85 - 7.5[3]
Characteristics
Spectral type	G5IV + G5IV
Variable type	RS Canum Venaticorum variable
Astrometry
Radial velocity (Rv)	+63.20 ± 1 km/s
Proper motion (μ)	RA: –44.46 ± 0.34[2] mas/yr Dec.: –44.36 ± 0.42[2] mas/yr
Parallax (π)	17.73±0.52 mas[2]
Distance	184 ± 5 ly (56 ± 2 pc)
Details
Radius	2.2[4] R☉
Temperature	5400[4] K
Other designations
TY Pyxidis, CD−27° 6141, HD 77137, HIP 44164, SAO 176805.
Database references
SIMBAD	data

The two components are both of spectral type G5IV,^[4] have a mass of 1.2 solar masses and revolve around each other every 3.2 days.^[5] Each star is around 2.2 times the diameter of the Sun.^[4]

The system is classified as either a RS Canum Venaticorum variable^[3] or a BY Draconis variable, stars that vary on account of prominent starspot activity,^[4] and lies 184 ± 5 light years away.^[2] 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.^[6]