The complete version giving the specifications and justification for most specifications. (ps file)

Bands Surveyed and Sensitivity

		Completeness and Reliability Mag. limits
Band	Wavelength (µm)	Point Sources (SNR=10)1	Extended Sources
J	1.25	15.8	15.0
H	1.65	15.12	14.33
Ks	2.17	14.3	13.5

Note: These specifications only apply to unconfused sources outside of the Galactic Plane (|b|>10^o), 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	>30o	20-30o	10-20o	<10o
Differential Completeness1
Point Sources	0.99	--	--	--
Extended Sources2	0.90	--	--	--
Differential Reliability1
Point Sources	0.9995	0.9995	0.9995	0.9995
Extended Sources	0.99	0.99	0.80	--

Note: These specifications only apply to unconfused sources outside of the Galactic Plane (|b|>10^o), 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

• Photometric precision
  • unconfused point sources (for sources with SNR >> 20): 5%
  • unconfused extended sources (for isophotal magnitude at 20 mag/square arcsecond): 10% (H < 13.8)
• Photometric spatial uniformity
  • point sources: 4%
  • extended sources: 10%
• Position Reconstruction Error (1 coordinate, 1 , SNR>20): 0.5"
• Brightest stars
  • bias (for K > 4): < 2%
  • repeatability:
    • 5% for K=8
    • 10% for 4<K<8
• Position reconstruction: 0.5" (1 ) for unconfused sources

• |b| > 10^o: 95%
  |b| < 10^o: 95%
• Overall coverage: no gaps > 200 sq. deg.

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