2MASS J07271824+1710012

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Coordinates: Sky map 07h 27m 18.24s, +17° 10′ 01.2″

2MASS J07271824+1710012
Observation data
Epoch J2000      Equinox J2000
Constellation Gemini
Right ascension 07h 27m 18.24s
Declination 17° 10′ 01.2″
Spectral type T7
Apparent magnitude (J) 15.600 ± 0.061
Apparent magnitude (H) 15.756 ± 0.171
Apparent magnitude (K) 15.556 ± 0.194
Proper motion (μ) RA: 1047 ± 0.9[1] mas/yr
Dec.: −764.2 ± 1[1] mas/yr
Parallax (π) 112.5 ± 0.9[1] mas
Distance 29.0 ± 0.2 ly
(8.89 ± 0.07 pc)
Temperature 800 – 1300 K
Other designations
2MASS 0727+1710
2MASSI J0727182+171001;
LEHPM 2- 461
2MASSW J0727182+171001
Database references

2MASS J07271824 +1710012 (abbreviated to 2MASS 0727+1710) is a brown dwarf of spectral class T7,[2][3] located in the constellation Gemini about 29 light-years from Earth.[1]


2MASS 0727+1710 was discovered in 2002 by Adam J. Burgasser et al. from Two Micron All-Sky Survey (2MASS), conducted from 1997 to 2001. Follow-up observations were made in 1998—2001 using the Near-Infrared Camera, mounted on the Palomar 60 inch (1.5 m) Telescope; CTIO Infrared Imager (CIRIM) and Ohio State Infrared Imager/Spectrometer (OSIRIS), mounted on the Cerro Tololo Inter-American Observatory (CTIO) 1.5 m Telescope; and some additional observations were made using the Near Infrared Camera (NIRC), mounted on the Keck I 10 m telescope, and nearinfrared camera D78, mounted on the Palomar 5 m Hale Telescope. In 2002 Burgasser et al. published a paper, where they defined new spectral subtypes T1—T8, and presented discovery of 11 new T-type brown dwarfs, among which also was 2MASS 0727+1710. This 11 objects were among the earliest T-type brown dwarfs ever discovered: before this, the total number of known T-type objects was 13, and this discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in SDSS data).[2]


Currently the most precise distance estimate of 2MASS 0727+1710 is published in 2012 by Dupuy & Liu trigonometric parallax, measured under The Hawaii Infrared Parallax Program: 112.5 ± 0.9 mas, corresponding to a distance 8.89 ± 0.07 pc, or 29.00 ± 0.23 ly.[1] A less precise parallax of this object, measured under U.S. Naval Observatory Infrared Astrometry Program, was published in 2004 by Vrba et al.[4]

2MASS 0727+1710 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Vrba et al. (2004) 110.14 ± 2.34 9.08 ± 0.20 29.61 ± 0.64 [4]
Dupuy & Liu (2012)
(preprint version 1)
115.9 ± 2.4 8.63 ± 0.18 28.14 ± 0.60 [5]
Dupuy & Liu (2012) 112.5 ± 0.9 8.89 ± 0.07 29.00 ± 0.23 [1]

Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.

Space motion[edit]

Position of 2MASS 0727+1710 shifts due to its proper motion by 1.2962 arcseconds per year.


Surface temperature of 2MASS 0727+1710 is 800-1300 K. As with other brown dwarfs of spectral type T, its spectrum is dominated of methane.

See also[edit]

The other 10 brown dwarfs, presented in Burgasser et al. (2002):[2]


  1. ^ a b c d e f Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". The Astrophysical Journal Supplement 201 (2): 19. arXiv:1201.2465. Bibcode:2012ApJS..201...19D. doi:10.1088/0067-0049/201/2/19. 
  2. ^ a b c Burgasser, A. J.; Kirkpatrick, J. D.; Brown, M. E.; Reid, I. N.; Burrows, A.; Liebert, J.; Matthews, K.; Gizis, J. E.; Dahn, C. C.; Monet, D. G.; Cutri, R. M.; Skrutskie, M. F. (2002). "The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification". The Astrophysical Journal 564 (1): 421–451. arXiv:astro-ph/0108452. Bibcode:2002ApJ...564..421B. doi:10.1086/324033. 
  3. ^ "2MASS J07271824+1710012 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-11-26. 
  4. ^ a b Vrba, F. J.; Henden, A. A.; Luginbuhl, C. B.; Guetter, H. H.; Munn, J. A.; Canzian, B.; Burgasser, A. J.; Kirkpatrick, J. Davy; Fan, X.; Geballe, T. R.; Golimowski, D. A.; Knapp, G. R.; Leggett, S. K.; Schneider, D. P.; Brinkmann, J. (2004). "Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program". The Astronomical Journal 127 (5): 2948–2968. arXiv:astro-ph/0402272. Bibcode:2004AJ....127.2948V. doi:10.1086/383554. 
  5. ^ Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". arXiv:1201.2465v1 [astro-ph.SR].

External links[edit]