GD 40

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GD 40
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 03h 02m 53.36s
Declination −01° 08′ 32.1″
Apparent magnitude (V) 15.56
Spectral type DA
Distance ? ly
(? pc)
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.

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.

See also[edit]


  1. ^ a b c 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.