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2MASS J11145133−2618235
	; 2MASS 1114-2618; Credit: legacy surveys
Observation data; Epoch J2000 Equinox J2000
Constellation	Hydra
Right ascension	11h 14m 51.337s
Declination	−26° 18′ 23.56″
Characteristics
Spectral type	T7.5
Apparent magnitude (i (GMOS filter system))	23.21 ± 0.09
Apparent magnitude (z (GMOS filter system))	19.59 ± 0.04
Apparent magnitude (J (2MASS filter system))	>15.86 ± 0.08
Apparent magnitude (J (MKO filter system))	15.52 ± 0.05
Apparent magnitude (H (2MASS filter system))	>15.73 ± 0.12
Apparent magnitude (H (MKO filter system))	15.82 ± 0.05
Apparent magnitude (KS (2MASS filter system))	>16.1
Apparent magnitude (KS (MKO filter system))	16.54 ± 0.05
Astrometry
Proper motion (μ)	RA: -3018.8 ± 1.1 mas/yr ; Dec.: -384.1 ± 1.4 mas/yr
Parallax (π)	179.2 ± 1.4 mas
Distance	18.2 ± 0.1 ly ; (5.58 ± 0.04 pc)
Details
Mass	0.029–0.048 M☉
Mass	30–50 MJup
Surface gravity (log g)	5.0–5.3 cgs
Temperature	725–775 K
Metallicity	-0.3 ± 0.1 [m/H]
Age	3–8 Gyr
Other designations
	2MASS J11145133-2618235,; 2MASS 1114-2618,; 2M1114−26,; 2M1114−2618,; 2MASS 1114−26,; 2MASS J1114−2618,; WISE J111448.79−261827.7
Database references
SIMBAD	data
	2M1114−26 Location of 2M1114−26 in the constellation Hydra;

2MASS J11145133−2618235 (designation abbreviated to 2MASS 1114−2618), ^[3] or 2M1114−26,^[2] or 2M1114−2618,^[2] or 2MASS 1114−26,^[4] or 2MASS J1114−2618^[6]) is a nearby brown dwarf of spectral class T7.5, located in constellation Hydra^[a] at approximately 18 light-years from Earth.^[7]

Discovery

2MASS 1114−2618 was discovered in 2005 by C. G. Tinney et al. from the 2MASS Wide-Field T Dwarf Search (WFTS), based on observations obtained at the Anglo-Australian Telescope, Siding Spring, Australia. In 2005 Tinney et al. published a paper in The Astronomical Journal, where they presented discovery of five new brown dwarfs of spectral type T, among which also was 2MASS 1114−2618.^[2]

Distance

Trigonometric parallax of 2MASS 1114−2618, measured in 2012 by Dupuy & Liu under The Hawaii Infrared Parallax Program, is 0.1792 ± 0.0014 arcsec, corresponding to a distance 5.58 ± 0.04 pc, or 18.20 ± 0.14 ly.^[7]

The photometric distance estimate of 2MASS 1114−2618, published in its discovery paper in 2005, is 7 pc (22.8 ly).^[2] Spectrophotometric distance estimate by Kirkpatrick et al. (2012), is 6.6 pc (21.5 ly).^[8]

Proper motion

2MASS 1114−2618 has quite a large proper motion of 3043.2 mas/yr with position angle 262.75 degrees,^[7] indicating motion in south-west direction on the sky. At distance 18.20 ly (assuming parallax 179.2 ± 1.4 mas),^[7] corresponding tangential velocity is 80.56 km/s.^[7]

Notes

^ The nearest known star/brown dwarf in this constellation.

References

^ ^a ^b ^c ^d ^e "2MASS J11145133-2618235 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 July 2012.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Tinney, C. G.; Burgasser, Adam J.; Kirkpatrick, J. Davy; McElwain, Michael W. (2005). "The 2MASS Wide-Field T Dwarf Search. IV. Hunting Out T Dwarfs with Methane Imaging". The Astronomical Journal. 130 (5): 2326–2346. arXiv:astro-ph/0508150. Bibcode:2005AJ....130.2326T. doi:10.1086/491734. S2CID 119451860.
^ ^a ^b ^c ^d ^e ^f Burgasser, Adam J.; Geballe, T. R.; Leggett, S. K.; Kirkpatrick, J. Davy; Golimowski, David A. (2006). "A Unified Near-Infrared Spectral Classification Scheme for T Dwarfs". The Astrophysical Journal. 637 (2): 1067–1093. arXiv:astro-ph/0510090. Bibcode:2006ApJ...637.1067B. doi:10.1086/498563. S2CID 8823326.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Leggett, Sandy K.; Marley, Mark S.; Freedman, Richard; Saumon, Didier; Liu, Michael C.; Geballe, Thomas R.; Golimowski, David A.; Stephens, Denise C. (2007). "Physical and Spectral Characteristics of the T8 and Later Type Dwarfs". The Astrophysical Journal. 667 (1): 537–548. arXiv:0705.2602. Bibcode:2007ApJ...667..537L. doi:10.1086/519948. S2CID 16667510.
^ ^a ^b ^c Leggett, Sandy K.; Saumon, Didier; Marley, Mark S.; Lodders, Katharina; Canty, J.; Lucas, Philip W.; Smart, Richard L.; Tinney, Chris G.; Homeier, Derek; Allard, France; Burningham, Ben; Day-Jones, Avril; Fegley, Bruce; Ishii, Miki; Jones, Hugh R. A.; Marocco, Federico; Pinfield, David J.; Tamura, Motohide (2012). "The Properties of the 500 K Dwarf UGPS J072227.51-054031.2 and a Study of the Far-red Flux of Cold Brown Dwarfs". The Astrophysical Journal. 748 (2): 74. arXiv:1201.2973. Bibcode:2012ApJ...748...74L. doi:10.1088/0004-637X/748/2/74. S2CID 14171934.
^ ^a ^b ^c ^d ^e ^f Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal. 752 (1): 56. arXiv:1203.5543. Bibcode:2012ApJ...752...56F. doi:10.1088/0004-637X/752/1/56. S2CID 18160586.
^ ^a ^b ^c ^d ^e ^f ^g ^h 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. S2CID 119256363.
^ ^a ^b Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Mace, Gregory N.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Mainzer, Amy K.; Burgasser, Adam J.; Tinney, Chris G.; Parker, Stephen; Salter, Graeme (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". The Astrophysical Journal. 753 (2): 156. arXiv:1205.2122. Bibcode:2012ApJ...753..156K. doi:10.1088/0004-637X/753/2/156. S2CID 119279752.