GD 40

GD 40 is a white dwarf in the constellation Cetus. 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.[1] The disrupted object should have had roughly the same mass of the Solar System asteroid 3 Juno.

GD 40

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cetus
Right ascension	03^h 02^m 53.36^s
Declination	−01° 08′ 32.1″
Apparent magnitude (V)	15.56
Characteristics
Spectral type	DA
Astrometry
Distance	? ly (? pc)
Details
Mass	0.59 [1] M☉
Radius	0.01? R☉
Luminosity	0.0049 L☉
Temperature	15300[1] K
Age	200 million years
Other designations
GD 40, EGGR 384, US 3562, WD 0300-019
Database references
SIMBAD	data

See also

• ZZ Piscium
• GD 61, white dwarf with an observed asteroid

References

1. Klein; et al. (2009). "Chemical Abundances in the Externally Polluted White Dwarf GD 40: Evidence of a Rocky Extrasolar Minor Planet". arXiv:0912.1422. Bibcode:2010ApJ...709..950K. doi:10.1088/0004-637X/709/2/950. Cite journal requires |journal= (help)