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]
| 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]