| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 03h 02m 53.10375s |
| Declination | −01° 08′ 33.7987″ |
| Apparent magnitude (V) | 15.56 |
| Characteristics | |
| Spectral type | DB |
| Astrometry | |
| Parallax (π) | 15.3618 ± 0.0456 mas |
| Distance | 212.3 ± 0.6 ly (65.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 11.30 |
| Details | |
| Mass | 0.59 M☉ |
| Radius | 0.01? R☉ |
| Luminosity | 0.0068 L☉ |
| Surface gravity (log g) | 7.91 ± 0.18 cgs |
| Temperature | 15300 K |
| Age | 200 million years |
| Other designations | |
GD 40, EGGR 384, US 3562, WD 0300-019 | |
| Database references | |
| SIMBAD | data |
GD 40 is a white dwarf in the constellation Cetus. It is located about 212 light-years (65 parsecs) away from the Sun. The star's spectrum has been found to show traces of external of metal contamination due to disruption of an extrasolar dwarf planet or an asteroid. The disrupted object should have had roughly the same mass of the Solar System asteroid 3 Juno.
See also
- ZZ Piscium
- GD 61, white dwarf with an observed asteroid
References
- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e Limoges, M.-M.; Bergeron, P. (2010). "A Spectroscopic Analysis of White Dwarfs in the Kiso Survey". The Astrophysical Journal. 714 (2): 1037–1051. arXiv:1003.4313. Bibcode:2010ApJ...714.1037L. doi:10.1088/0004-637X/714/2/1037. S2CID 118618131.
- ^ a b c Klein; et al. (2010). "Chemical Abundances in the Externally Polluted White Dwarf GD 40: Evidence of a Rocky Extrasolar Minor Planet". The Astrophysical Journal. 709 (2): 950–962. arXiv:0912.1422. Bibcode:2010ApJ...709..950K. doi:10.1088/0004-637X/709/2/950. S2CID 118312133.
