2MASS J07464256 + 2000321
| 2MASS J0746425 + 200321 | |
|---|---|
|
Observation dates equinox : J2000.0 , epoch : J2000.0 |
|
| Constellation | Gemini |
| Right ascension | 07 h 46 m 42.5 s |
| declination | + 20 ° 00 ′ 32 ″ |
| Brightness (V-band, common) | (19.87 ± 0.06) mag |
| Brightness (K-band, common) | (10.468 ± 0.022) mag |
| Spectral class | approx. L0 + approx. L1.5 |
| Double system | |
| Angular distance | 0 ", 22 |
| Position angle | 15 ° |
| Astrometry | |
| Trigonometric parallax | (81.9 ± 0.3) mas |
| distance | (12.21 ± 0.04) pc |
| Proper movement : | |
| Relative self-movement | (378.5 ± 0.3) mas / a |
| Position angle | 261 °, 2 ° ± 0 °, 1 |
| Other names | |
| 2MASS J07464256 + 2000321 • 2MASSI J0746425 + 200032 • WDS 07467 + 2001 • LSPM J0746 + 2000 • 2MUCD 10668 • 2MASSW J0746425 + 200032 | |
2MASSW J0746425 + 200032 or 2MASS J0746425 + 200321 (also short 2M 0746 + 20 ) is a double system of two L-dwarfs in the constellation Gemini . The semi-major axis of the orbit is estimated at 2.9 AU, its eccentricity at 0.5; the period of revolution is about 4600 days. The difference in brightness between the two components in the V-band is around 0.8 mag.
The object was discovered in 2000 as a cool L-dwarf with the help of 2MASS and POSS-II . Through observations with the Hubble Space Telescope , it was established in 2001 that it is a double system.
Web links
- I. Neill Reid, J. Davy Kirkpatrick, JE Gizis, CC Dahn, DG Monet, Rik J. Williams, James Liebert, AJ Burgasser: Four Nearby L Dwarfs . Astrophysics, 1999. Online
- 2MASS J07464256 + 2000321 on SIMBAD
- QM Konopacky et al .: High-precision Dynamical Masses of Very Low Mass Binaries. In The Astrophysical Journal, Issue 2 (2010 March 10). On-line