UY Sextantis

UY Sextantis

File:UYSexLightCurve.png A white light light curve for UY Sextantis, adapted from Billeres et al. (1997). All five panels form a single 10,000 second light curve, with the top panel continued on the second panel, etc.
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Sextans
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	13.49
Characteristics
Spectral type	sdO9VII:He6
Variable type	V361 Hya
Astrometry
Radial velocity (Rv)	13.6 km/s
Proper motion (μ)	RA: −20.528 mas/yr Dec.: −38.421 mas/yr
Parallax (π)	1.4559±0.0789 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Details
Mass	0.490±0.014 Template:Solar mass
Radius	0.17±0.01 Template:Solar radius
Luminosity	25.86 Template:Solar luminosity
Surface gravity (log g)	5.83±0.01 cgs
Temperature	34,850±90 K
Rotation
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist, PG 1047+003
Database references
SIMBAD	data

UY Sextantis is a post-AGB blue-white subdwarf star, located in the constellation of Sextans. The star is classed as member of the V361 Hydrae type (or also called sdBV_r type) class of pulsators in the field of asteroseismology, although it is now generally classified as class O. No additional stellar companion has been detected in tight orbit or imaged around the subdwarf star.

The star's variability was discovered in 1998 by D. O'Donoghue et al.. It was given its variable star designation in 2000. It has an apparent magnitude of 13.5 and the brightness changes amount to less than 0.1 magnitudes, with a typical period of 142 seconds.