Instrument Information
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| IDENTIFIER |
urn:nasa:pds:context:instrument:flwo.2mass1m3.2massnorth::1.1
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| NAME |
2MASS CAMERA - NORTH
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| TYPE |
IMAGER
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| DESCRIPTION |
Each 2MASS camera consisted of a liquid nitrogen cryostat which contained three256x256 NICMOS3 arrays. Each array viewed the same region of the sky viabeamsplitting dichroics. The light passed through both dichroics to the Ks-bandarray. The first dichroic reflection fed the light to the J-band array. All threeoptical paths shared the same first element located behind a cryogenic field stop.Each optical path had six other lenses. This set of six lenses was identical for eachband. The lenses were composed of water-free fused silica (Infrasil) or calciumfluoride. All lens surfaces were spherical. All optical elements were anti-reflectioncoated and the integrated optical assembly transmitted ~70% of the incident light. Aband-limiting interference filter located near a pupil image established the systembandpass. Table 1 summarizes the Survey's bandpasses:Table 1: 2MASS 50% TransmissionBand[INVALID_PDS_CHARACTER]Optics and Camera[INVALID_PDS_CHARACTER]System +AtmosphereJ 1.11 - 1.40 um 1.12 - 1.36 umH 1.51 - 1.79 um 1.51 - 1.78 umKs [INVALID_PDS_CHARACTER]2.00 - 2.31 um 2.02 - 2.30 umThis instrument catalog refers to the 2MASS camera used at the northern hemisphere2MASS facility, at the Whipple Observatory in Arizona.
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| MODEL IDENTIFIER |
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| NAIF INSTRUMENT IDENTIFIER |
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| SERIAL NUMBER |
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| REFERENCES |
Milligan et al., SPIE Proceedings Volume 2863, p. 2, 1996.
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