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2MASS logo
Organization UMass
IPAC (JPL / Caltech)
Wavelength infrared (2 μm, 1.25 μm, 1.65 μm, 2.17 μm)
Data sources Two 1.3 m equatorially mounted Cassegrain reflector telescopes (Whipple Observatory, Arizona, USA; Cerro Tololo, La Serena, Chile)
Goals galaxies, brown dwarfs
Data products images
point source catalogue
extended object catalogue
2MASS J-band image, the brown dwarf 2MASS J17111353+2326333 is highlighted.

The Two Micron All-Sky Survey (2MASS) was a survey of the whole sky in three infrared wavebands around 2 micrometres (μm): J (1.25 μm), H (1.65 μm), and Ks (2.17 μm).[1] The observations for the survey were taken between 1997 and 2001, at Mt. Hopkins, Arizona for the Northern Hemisphere data and Cerro Tololo Inter-American Observatory, Chile, for the southern hemisphere.[2] The final data release for 2MASS occurred in 2003, and is served by the Infrared Science Archive. The goals of this survey included:

Numerical descriptions of point sources (stars, planets, asteroids) and extended sources (galaxies, nebulae) were cataloged by automated computer programs to an average limiting magnitude of about 14. More than 300 million point sources and 1 million extended sources were cataloged. In November 2003, a team of scientists announced the discovery of the Canis Major Dwarf Galaxy, at that time the closest known satellite galaxy to the Milky Way, based on analysis of 2MASS stellar data.

The resulting data and images from the survey are currently in the public domain, and may be accessed online for free by anyone.[6] There is also a list of 2MASS science publications with links to free pre-publication copies of the papers.[7]

2MASS is sponsored by the University of Massachusetts Amherst, the Infrared Processing and Analysis Center (IPAC, run by Jet Propulsion Laboratory (JPL) and Caltech), NASA, and the National Science Foundation (NSF).

See also[edit]


  1. ^ "About 2MASS (A Brief Explanation of 2MASS)". University of Massachusetts, Infrared Processing and Analysis Center (JPL/ Caltech), NASA, NSF. 2006-02-01. Retrieved 2008-09-21. 
  2. ^ "Two Micron All Sky Survey (2MASS)". NASA/IPAC Infrared Science Archive. Retrieved 2011-10-22. 
  3. ^ Kirkpatrick (2003). "2MASS Data Mining and the M, L, and T Dwarf Archives" (PDF). IAU Symposium Vol. 211 ("Brown Dwarfs") 211. arXiv:astro-ph/0207672v1. Bibcode:2003IAUS..211..189K. 
  4. ^ Froebrich, D.; Scholz, A.; Raftery, C. L. (2007). A systematic survey for infrared star clusters with |b| <20° using 2MASS, MNRAS, 347, 2
  5. ^ Majaess, D. (2013). Discovering protostars and their host clusters via WISE, ApSS, 344, 1
  6. ^ "2MASS Data Access". The Two Micron All Sky Survey at IPAC. December 20, 2006. Retrieved September 2, 2012. 
  7. ^ "2MASS Science Publications". The Two Micron All Sky Survey at IPAC. February 1, 2006. Retrieved September 2, 2012. 

External links[edit]