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2M1207

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2M1207
Observation data
Epoch J2000.0
Constellation Centaurus
Right ascension 12h 07m 33.4s
Declination -39° 32' 54"
Apparent magnitude (V) 13 <tr valign=top><td>Distance</td><td>173 ly
(53 pc)</td></tr><tr valign=top><td>Spectral type</td><td>M8V</td></tr>
Other designations
2MASSW J1207334-393254

2M1207, 2M1207A or 2MASSWJ 1207334-393254 is a brown dwarf star located at in the constellation Hydra; a companion object, 2M1207b, is believed to be one of the first extrasolar planets to be directly imaged, and is the first exoplanet to be discovered in orbit of a brown dwarf.

Located at right ascension 12hr 7min 33.4sec, and declination -39° 32′ 54″ (J2000.0 celestial coordinates), 2M1207 was discovered during the course of the 2MASS infrared sky survey: hence the "2M" in its name, followed by its celestial coordinates. It is roughly 53 parsecs away; with a fairly early (for a brown dwarf) spectral type of M8, it is very young, and a likely member of the TW Hydrae association. Its estimated mass is around 21 Jupiter masses.

In December 2005, American astronomer Eric Mamajek reported a more accurate distance to 2M1207 using the moving cluster method. The new distance (revised downwards from 70 parsecs) results in a fainter luminosity for 2M1207A, and its mass was revised downwards from an original value of 25 Jupiter masses.

2M1207b

Main article: 2M1207b
2M1207b
Extrasolar planet Lists of extrasolar planets
Observed position
Observed separation (d) 41 ± 5 AU
Physical characteristics
Mass (m) 3.3+1.5-1.0 MJ
Radius (r) 1.5 RJ
Density (ρ)  ? kg/m3
Temperature (T) 1250 ± 200 K
Discovery information
Discovery date 2004
Discoverer(s) Chauvin et al.
Detection method Imaged
Discovery status Confirmed
File:Phot-14a-05-preview.jpg

2M1207b is a planetary mass companion to 2M1207 detected in 2004 by imaging.

References

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