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The digest2 NEO Classification Code
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DOI：10.1088/1538-3873/ab1157.png)
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Abstract
En 中文
We describe the digest2 software package, a fast, short-arc orbit classifier for small solar system bodies. The digest2 algorithm has been serving the community for more than 13 yr. The code provides a score, D-2, which represents a pseudo-probability that a tracklet belongs to a given solar system orbit type. digest2 is primarily used as a classifier for Near-Earth Object (NEO) candidates, to identify those to be prioritized for follow-up observation. We describe the historical development of digest2 and demonstrate its use on real and synthetic data. We find that digest2 can accurately and precisely distinguish NEOs from non-NEOs. At the time of detection, 14% of NEO tracklets and 98.5% of non-NEOs tracklets have D2 below the critical value of D-2 = 65.94% of our simulated NEOs achieved the maximum D-2 = 100% and 99.6% of NEOs achieved D-2 >= 65 at least once during the simulated 10-year timeframe. We demonstrate that D-2 varies as a function of time, rate of motion, magnitude and sky-plane location, and show that NEOs tend to have lower D-2 at low Solar elongations close to the ecliptic. We use our findings to recommend future development directions for the digest2 code.
Keywords:
astrometry
celestial mechanics
methods: analytical
methods: numerical
minor planets
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