| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Vela |
| Right ascension | 23h56m 45.576s[1] |
| Declination | −20° 54′ 45.01″[1] |
| Characteristics | |
| Spectral type | DC[2] or DZ[3] |
| Astrometry | |
| Distance | 211.3 ± 8.2 ly (64.8 ± 2.5 pc)[3] ly |
| Details | |
| Surface gravity (log g) | 8.26±0.15[3] cgs |
| Temperature | 4,310±190[3] K |
| Age | 8.0±0.8[3] Gyr |
| Database references | |
| SIMBAD | data |
WD J2356−209 (also known as WD 2354−211)[4] is a white dwarf star located 65 pc (212 ly) away from the Earth.[5] It is a very faint white dwarf, with an apparent visual magnitude of 21.03.[6] Its visible spectrum is dominated by a broad absorption feature[2] that has been attributed to pressure-broadened sodium D lines.[7] The presence of this sodium absorption feature and the detection of spectral lines from other heavy elements (calcium, iron and magnesium) indicate that the photosphere of WD J2356−209 has been polluted by a recent rocky debris accretion episode. A detailed analysis of the spectrum of WD J2356−209 shows that the accreted planetesimal was abnormally sodium-rich, containing up to ten times more sodium than calcium.[3] With an effective temperature of 4040 K, WD J2356−209 is the coolest metal-polluted white dwarf observed to date (and also the oldest, with a white dwarf cooling age of about 8 Gyr).[3]
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