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G 240-72
G 240-72 (or WD 1748+708, or LHS 455, or GJ 1221) is a nearby white dwarf (degenerate star) of spectral class DQP9.0, located 20.3 light-years away in the constellation Draco.
G 240-72 is the seventh closest white dwarf (after Sirius B, Procyon B, van Maanen's star, Gliese 440, 40 Eridani B and Stein 2051 B). Its trigonometric parallax, as measured by the Gaia space telescope, is 160.9952±0.0119 mas, corresponding to a distance of 6.2114 parsecs (20.259 light-years).
G 240-72 has a mass of 0.81 Solar masses and surface gravity 108.36 (2.29×108) cm·s−2, or approximately 234 000 of Earth's, corresponding to a radius 6850 km, or 107% of Earth's.
This white dwarf has a relatively low temperature of 5590 K (slightly cooler than the Sun), and an old cooling age, i.e. the age as a degenerate star (not counting the duration of its previous existence as a main sequence and giant star) of 5.69 Gyr. It has a white appearance, due to its similar temperature to the Sun. It has a pure helium atmosphere and rotates very slowly, with period of possibly over 100 years.
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G 240-72
G 240-72 (or WD 1748+708, or LHS 455, or GJ 1221) is a nearby white dwarf (degenerate star) of spectral class DQP9.0, located 20.3 light-years away in the constellation Draco.
G 240-72 is the seventh closest white dwarf (after Sirius B, Procyon B, van Maanen's star, Gliese 440, 40 Eridani B and Stein 2051 B). Its trigonometric parallax, as measured by the Gaia space telescope, is 160.9952±0.0119 mas, corresponding to a distance of 6.2114 parsecs (20.259 light-years).
G 240-72 has a mass of 0.81 Solar masses and surface gravity 108.36 (2.29×108) cm·s−2, or approximately 234 000 of Earth's, corresponding to a radius 6850 km, or 107% of Earth's.
This white dwarf has a relatively low temperature of 5590 K (slightly cooler than the Sun), and an old cooling age, i.e. the age as a degenerate star (not counting the duration of its previous existence as a main sequence and giant star) of 5.69 Gyr. It has a white appearance, due to its similar temperature to the Sun. It has a pure helium atmosphere and rotates very slowly, with period of possibly over 100 years.