EC 20058-5234

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]
Distance388 ± 3 ly
(118.8 ± 0.9 pc)
Details
Mass0.569 ± 0.022[7] M☉
Surface gravity (log g)7.91 ± 0.05[8] cgs
Temperature24,843 ± 1,363[7] K
Other designations
QU Telescopii, Gaia DR2 6665910709364014336
Database references
SIMBADdata

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 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]

  1. ^ a b Cite error: The named reference Koen1995 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference ODon2013 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Beauchamp1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference McCook2014 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference AAVSOQU was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference G.F2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference G.F2021 was invoked but never defined (see the help page).