SIMP J013656.5+093347

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SIMP J013656.5+093347
Observation data
Epoch J2000      Equinox J2000
Constellation Pisces
Right ascension 01h 36m 57s
Declination +09° 33′ 47.3″
Spectral type T2.5[1]
Apparent magnitude (J) 13.455 ± 0.030
Apparent magnitude (H) 12.771 ± 0.032
Apparent magnitude (K) 12.562 ± 0.024
Parallax (π)156.25 ± 7[2] mas
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.

In 2017, it was announced that the object's mass may be as low as 12.7 Jupiter masses and should be considered a planet rather than a Brown Dwarf as it seems to be a member of the relatively young, 200 million-year-old Carina-Near stellar moving group.[3][4][5]

In 2018, astronomers noted, "Detecting SIMP J01365663+0933473 with the VLA through its auroral radio emission, also means that we may have a new way of detecting exoplanets, including the elusive rogue ones not orbiting a parent star ... This particular object is exciting because studying its magnetic dynamo mechanisms can give us new insights on how the same type of mechanisms can operate in extrasolar planets - planets beyond our Solar System ... We think these mechanisms can work not only in brown dwarfs, but also in both gas giant and terrestrial planets."[5]


  1. ^ Artigau et al. (2009). "Photometric Variability of the T2.5 Brown Dwarf SIMP J013656.5+093347: Evidence for Evolving Weather Patterns". The Astrophysical Journal. arXiv:0906.3514Freely accessible. Bibcode:2009ApJ...701.1534A. doi:10.1088/0004-637X/701/2/1534. 
  2. ^ Artigau et al. (2006). "Discovery of the Brightest T Dwarf in the Northern Hemisphere". The Astrophysical Journal. arXiv:astro-ph/0609419Freely accessible. Bibcode:2006ApJ...651L..57A. doi:10.1086/509146. 
  3. ^ Gagné, Jonathan; Faherty, Jacqueline K.; Burgasser, Adam J.; Artigau, Étienne; Bouchard, Sandie; Albert, Loïc; Lafrenière, David; Doyon, René; Bardalez-Gagliuffi, Daniella C. (2017-05-15). "SIMP J013656.5+093347 is Likely a Planetary-Mass Object in the Carina-Near Moving Group". The Astrophysical Journal. 841 (1): L1. doi:10.3847/2041-8213/aa70e2. ISSN 2041-8213. 
  4. ^ "Presto change-o! Brown dwarf star is now a planet". Retrieved 2018-08-07. 
  5. ^ a b Starr, Michelle (3 August 2018). "There Is an Absolutely Gigantic Rogue Planet Wandering Our Galactic Neighbourhood". Retrieved 3 August 2018. 

Coordinates: Sky map 01h 36m 57s, +09° 33′ 47″