CBSD: The Celestial Background Scene Descriptor

Abstract : This report documents the Celestial Background Scene Descriptor (CBSD) program which is a suite of models to simulate the radiance of astronomical sources. The model simulate the contribution of the celestial background in the wavelength regime 2 to 30 micrometers with a positional accuracy of 2 arcseconds. The output of the models are tables and images suitable for use in sensor simulation. The CBAMP model calculates the thermal radiance and scattered light for the solar system objects including the Sun, Moon, the planets, the Galilean Satellites, 4559 numbered asteroids, and 9643 unnumbered asteroids. The solar system dust cloud (Zodiacal light model CBZODY uses a Lorentzian out of the plane dust density distribution to derive a number density from which the emitted and scattered radiances are computed. The stellar point sources model, CBPNTS, is a 'fast' running scene generator version of the Air Force/NASA/Ames statistical point source model, SKY. The sky is divided into 899 regions with size inversely proportional to stellar density. In addition, there are 87 different spectral classes, including 82 classes, including 82 classes of stars, two classes each of planetary and reflection nebulae, and one of compact HII regions. The nature of the galactic infrared cirrus is discussed