EC 20058-5234

EC 20058-5234 (QU Telescopii), is a star in the constellation Telescopium. With an apparent magnitude of 15.03,^[3] it's impossible to detect with the naked eye and requires a powerful telescope to be seen; this degenerate object is located 388 light years from the Solar System based on parallax.^[2]

QU Telescopii

A visual band light curve for QU Telescopii, adapted from Koen et al. (1995)[1]
Observation data Epoch J2000.0      Equinox J2000.0(ICRS)
Constellation	Telescopium
Right ascension	20h 09m 40.19s[2]
Declination	−52° 25′ 15.86″[2]
Apparent magnitude (V)	15.03[3]
Characteristics
Evolutionary stage	white dwarf
Spectral type	DB2[4]
U−B color index	−0.71[5]
B−V color index	−0.04[5]
Variable type	V777 Herculis[6]
Astrometry
Proper motion (μ)	RA: +12.024 mas/yr[2] Dec.: -76.714 mas/yr[2]
Parallax (π)	8.4145±0.0650 mas[2]
Distance	388 ± 3 ly (118.8 ± 0.9 pc)
Details
Mass	0.569 ± 0.022[7] M☉
Surface gravity (log g)	7.91 ± 0.05[8] cgs
Temperature	24,843 ± 1,363[7] K
Other designations
QU Telescopii, Gaia DR2 6665910709364014336
Database references
SIMBAD	data

QU Telescopii has a classification of DB2, which states it's a white dwarf with He I lines present in its atmosphere. At the moment, it has 56.9% the mass of the Sun,^[7] but a high surface gravity suggests QU Telescopii has a low radius.^[8] It has an effective temperature of 24,843 K,^[7] which gives it a blue hue as opposed to a white hue. QU Telescopii belongs to a class of stars known as V777 Herculis variables or DBV stars.^[6] First noticed in the Edinburgh-Cape Blue Object Survey published in 1992, it was found to be variable in 1995.^[1]