SIMP J013656.5+093347
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 36m 57s |
| Declination | +09° 33′ 47.3″ |
| Characteristics | |
| Spectral type | T2.5 |
| Apparent magnitude (J) | 13.455 ± 0.030 |
| Apparent magnitude (H) | 12.771 ± 0.032 |
| Apparent magnitude (K) | 12.562 ± 0.024 |
| Astrometry | |
| Parallax (π) | 156.25 ± 7[1] mas |
| Distance | 20.9 ± 0.9 ly (6.4 ± 0.3 pc) |
| Details | |
| Other designations | |
2MASS J01365662+0933473; IPMS J013656.57+093347.3; IBIS J013656.57+093347.3 | |
SIMP J013656.5 +093347 is a brown dwarf in the constellation Pisces. It belongs to the spectral class T2.5 and its position shifts due to its proper motion annually by about 1.24 arcsec with a position angle of about 90°.
This brown dwarf provided the first evidence for periodic variability flux variations among T dwarfs. This has been interpreted as a signature of weather patterns coming in and out of view over the object's 2.4h rotation period. The shape of this lightcurve evolves over timescales of days, which has been interpreted as a sign of evolution of the cloud patterns in its atmosphere.
References
- ↑ Artigau et al.: "Discovery of the Brightest T Dwarf in the Northern Hemisphere"; in: The Astrophysical Journal, Bd. 651, Nr. 1, S. L57-L60 (2006)
- Artigau et al.: "Photometric Variability of the T2.5 Brown Dwarf SIMP J013656.5+093347: Evidence for Evolving Weather Patterns"; in: The Astrophysical Journal, Bd. 701, Nr. 2, S. 1534ff. (2009)
Coordinates: 
01h 36m 57s, +09° 33′ 47″
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