Wolf 940
|
Star wolf 940 |
|||
|---|---|---|---|
| AladinLite | |||
|
Observation dates equinox : J2000.0 , epoch : J2000.0 |
|||
| 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 |
||
| 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 |
||
| Physical Properties | |||
| Effective temperature | B: (570 ± 25) K | ||
|
Other names and catalog entries |
|||
|
|||
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 .