Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pyxis |
Right ascension | 08h 41m 32.42908s[1] |
Declination | –32° 56′ 32.9158″[1] |
Apparent magnitude (V) | 11.85[2] |
Characteristics | |
Spectral type | DA5.5 |
U−B color index | −0.59[3] |
B−V color index | +0.25[4] |
Astrometry | |
Radial velocity (Rv) | +29.3 ± 2.9 km/s |
Proper motion (μ) | RA: –1061.158 mas/yr[1] Dec.: 1345.900 mas/yr[1] |
Parallax (π) | 117.3961 ± 0.0205 mas[1] |
Distance | 27.783 ± 0.005 ly (8.518 ± 0.001 pc) |
Absolute magnitude (MV) | 12.14 ± 0.05[5] |
Details | |
Mass | 0.45 ± 0.01[5] M☉ |
Luminosity | 0.0015[5] L☉ |
Temperature | 9120 ± 190[5] K |
Age | 550 ± 20 million[5] years |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
Gliese 318 is a white dwarf in the constellation Pyxis. Its spectral type is DA5.5 and it has a visual magnitude of 11.85,[2] and lies 27.8 light-years (8.5 parsecs) away.[6] The star was too faint to have had its parallax measured by the Hipparcos satellite. Earth-based measurement in 2009 gave its parallax as 113.63 ± 1.97 milliarcseconds, yielding a distance of 28.7 ± 0.5 light-years;[5] this parallax measurement has since been substantially improved by Gaia. It is around 45% as massive as the Sun but has only 0.15% its luminosity.[5]
Bragaglia et al. suspect this star to be a double white dwarf due to strong spectral line variations.[7] From Gaia DR2 it was not possible to confirm this claim. It is still possible that Gliese 318 is a double white dwarf and additional spectroscopic observations are needed in order to confirm this claim.[8] Gliese 318 could be the closest double white dwarf to earth.[9][10]
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