Asteroid detection with DENIS

Astronomy and Astrophysics – Astronomy

Scientific paper

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Asteroids, Detection, Identifying, Infrared Astronomy, Sky Surveys (Astronomy), Stellar Color, Stellar Magnitude, Comparison, Computer Programs, Near Infrared Radiation, Position (Location), Spectral Reflectance, Stars, Stellar Spectrophotometry

Scientific paper

Most of the 5000 asteroids already catalogued are likely to be detected by the Deep Near-Infrared Survey (DENIS). Orbital parameters and visual photometric data are available for these asteroids so that their ephemeris (right ascension, declination and visual magnitude) can be calculated. Many unknown bodies will also be recorded. The accurate positions of the catalogued asteriods have been calculated in advance with a computer program. This should allow us to recognize these bodies in real time. The software has been modified in order to give also an estimation of the magnitudes V, I, J, K. The magnitudes I, J, K are deduced from the visual magnitude by application of color indices V-I, V-J, V-K. To determine these color indices, we used the photometric data of a 52-color survey in the near infrared (Bell et al., 1988). This survey provides the 52 reflectances of 119 asteroids of different classes. We converted these reflectances into color indices and then determined average color indices for each class of asteroids. The main purpose of these estimations is to avoid erroneous identification between asteroids and classes of stars with near infrared color indices comparable to those of asteroids. Apart from the position criterion, a photometric criterion can be deduced from a color diagram, to separate stars and asteroids.

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