Fig. 1 from The Two Micron All Sky Survey (2MASS)

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The Two Micron All Sky Survey (2MASS)

Authors: M. F. Skrutskie, R. M. Cutri, R. Stiening, M. D. Weinberg, S. Schneider, J. M. Carpenter, C. Beichman, R. Capps, T. Chester, J. Elias, J. Huchra, J. Liebert, C. Lonsdale, D. G. Monet, S. Price, P. Seitzer, T. Jarrett, J. D. Kirkpatrick, J. E. Gizis, E. Howard, T. Evans, J. Fowler, L. Fullmer, R. Hurt, R. Light, E. L. Kopan, K. A. Marsh, H. L. McCallon, R. Tam, S. Van Dyk, and S. Wheelock

Skrutskie et al. 2006 The Astronomical Journal 131 1163.

Provider: AAS Journals

Caption: Fig. 1.

2MASS camera optics. Light enters through the ZnSe window at right. The Cassegrain focal plane lies 10 cm behind the window at a cryogenic field stop. A first lens is common to all three bands. Two dichroic mirrors immediately follow this common lens to split the light between the three bandpasses with the J‐band light reflected first and the K_s‐band light undeviated. Broadband filters near each Lyot stop primarily define the bands.

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