Survey Level 1 Requirements

Bands Surveyed and Sensitivity

 Completeness and Reliability Mag. limits
BandWavelength (µm)Point Sources (SNR=10)1Extended Sources
J1.2515.815.0
H1.6515.1214.33
Ks2.1714.313.5
Note: These specifications only apply to unconfused sources outside of the Galactic Plane (|b|>10o), and outside of any confusion-limited areas of the sky outside of the Galactic Plane.
1 At SNR=10, (mag) = 2.5 / ln 10 = 0.109
2 The feasibility of this requirement is uncertain due to lack of knowledge of the background variations at H.
3 14.2 in Level 1 Science Requirements Document was a misprint. All values intended to be 0.8 mag brighter than point source limits.

Completeness and Reliability

 Absolute Galactic Latitude Range
Parameter>30o20-30o10-20o<10o
Differential Completeness1
Point Sources0.99------
Extended Sources20.90------
Differential Reliability1
Point Sources0.99950.99950.99950.9995
Extended Sources0.990.990.80--
Note: These specifications only apply to unconfused sources outside of the Galactic Plane (|b|>10o), and outside of any confusion-limited areas of the sky outside of the Galactic Plane.
1 Differential Completeness (Reliability) is the completeness (reliability) of sources falling in the last half-magnitude bin above the completeness limit.
2 The completeness for extended sources applies only to galaxies that can be reliably distinguished from point sources, with "shape" values 0.5" greater than those of the mean point sources.

Photometric and Positional Accuracy

Sky coverage

[Last Updated: 1997 June 26; by T. Chester]


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