Wolf 940
Star wolf 940 |
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AladinLite | |||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Aquarius | ||
Right ascension | 21 h 46 m 40 s | ||
declination | -00 ° 10 ′ 25 ″ | ||
Apparent brightness | A: 12.7 mag | ||
Typing | |||
Spectral class | A: M4 B: T8.5 |
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Astrometry | |||
Radial velocity | (−31.6 ± 12.2) km / s | ||
parallax | (79.8 ± 4.5) mas | ||
distance | (40.9 ± 2.3) ly (12.5 ± 0.7) pc |
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Physical Properties | |||
Effective temperature | B: (570 ± 25) K | ||
Other names and catalog entries |
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Wolf 940 is a system of a red dwarf and a brown dwarf, around 40 light years from Earth . The two objects are separated from each other by about 32 arc seconds (approx. 400 AU).
The discovery of the cool companion Wolf 940 B was announced in February 2009 by an international team of astronomers headed by Ben Birmingham. Wolf 940 B belongs to the spectral class T8.5; its surface temperature is estimated to be around 600 Kelvin . This makes this brown dwarf one of the coolest substellar objects that has been discovered so far. Its mass is given as 20 to 30 Jupiter's masses .