2MASS J11083081 + 6830169
2MASS J11083081 + 6830169 | |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Great Bear (Ursa major) |
Right ascension | 11 h 08 m 31 s |
declination | + 68 ° 30 ′ 17 ″ |
Brightness (J-band) | (13.1 ± 0.02) mag |
Spectral class | approx L0.5 |
Proper movement | |
μ dead | 0.32 ± 0.04 mas / a |
PA | 230 ° ± 6 ° |
Catalog names | |
MM Ursae Majoris, LSPM J1108 + 6830, 2MUCD 10960, USNO-B1.0 1585-00117168 |
2MASS J11083081 + 6830169 , also 2MASSW J1108307 + 683017 or 2MASSI J1108307 + 683017 , is a variable L-dwarf in the constellation Great Bear (Ursa major).
The property was acquired in June 1999 by Gizis et al. after analyzing 2MASS and POSS-II data spectroscopically examined and identified as an ultra-cool dwarf. They observed a strong Hα emission. Photometric investigations in the I-band by Gelino et al. (2002) showed a non-periodic variability. As an interpretation of this observation, Gelino et al. suggest that the brightness fluctuations could be due to the changes in clouds in the atmosphere and not to a changing activity of the object.
literature
- Schmidt et al .: "Activity and Kinematics of Ultracool Dwarfs, Including an Amazing Flare Observation"; in: The Astronomical Journal 133 (5), 2007, pp. 2258-2273; bibcode : 2007AJ .... 133.2258S , doi : 10.1086 / 512158 .
- Gelino et al .: "L Dwarf Variability: I-Band Observations"; in: The Astrophysical Journal 577 (1), 2002, pp. 433-446; bibcode : 2002ApJ ... 577..433G , doi : 10.1086 / 342150 .
- Gizis et al .: "New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence"; in: The Astronomical Journal 120 (2), 2000, pp. 1085-1099; bibcode : 2000AJ .... 120.1085G , doi : 10.1086 / 301456 .