SDSS J1228+1040
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 28m 59.93s |
| Declination | +10° 40′ 33.05″ |
| Characteristics | |
| Evolutionary stage | white dwarf |
| Spectral type | DAZ |
| Apparent magnitude (G) | 16.4 |
| Astrometry | |
| Proper motion (μ) | RA: -50.254 ±0.069 mas/yr Dec.: -24.729 ±0.049 mas/yr |
| Parallax (π) | 7.7634±0.0662 mas |
| Distance | 420 ± 4 ly (129 ± 1 pc) |
| Details | |
| Mass | 0.705 ±0.051 M☉ |
| Radius | 0.01169 ±0.00078 R☉ |
| Surface gravity (log g) | 8.150 ±0.089 cgs |
| Temperature | 20,713 ±281 K |
| Age | cooling age: 100 ±5 Myr total age: 170 Myr |
| Other designations | |
| GALEX J122859.9+104032, WD 1226+110, WD 1226+109, LAMOST J122859.93+104032.9, SDSS J122859.93+104032.9, WIRED J122859.93+104032.9, WISE J122859.87+104032.8 | |
| Database references | |
| SIMBAD | data |
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SDSS J1228+1040 (SDSS J122859.93+104032.9, WD 1226+110) is a white dwarf with a debris disk around it. The disk formed when a planetary body was tidally disrupted around the white dwarf. It is the first gaseous disk discovered around a white dwarf.
SDSS J1228+1040 was first identified as a white dwarf in 2006 from SDSS spectroscopic data. These observations identified it as a DA white dwarf, which indicates the detection of hydrogen.