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Shape Model of 2015 DP155 Using Radar and Lightcurve Observations

Presentation #523.01 in the session Observing and Modeling NEO Properties (iPosters).

Published onOct 20, 2022
Shape Model of 2015 DP155 Using Radar and Lightcurve Observations

2015 DP155 is a potentially hazardous asteroid, with its next closest approach after 2018 (~0.02 au, ~7 lunar distances) in the year 2080 (also ~0.02 au). It has an estimated volume-equivalent diameter of ~140 meters (Repp et al. 2020, LPSC ID: 2897), placing it among the smallest asteroids with a shape model. It was observed by both the Arecibo Observatory (4 consecutive days of observation) and the Goldstone Solar System Radar (6 days of observation of the course of about a week and half) during June of 2018. Optical observations were taken by Terskol Observatory, the Center for Solar System Studies Palmer Divide Station, the Northolt Branch Observatories, and the European Southern Observatory from May to June of the same year.

Starting with the previous model made by Repp et al. 2020, we use both radar and optical lightcurve data from its close approach in 2018 to construct a 3D shape model of 2015 DP155 with the SHAPE modeling software (Magri et al. 2007). We find its shape to be elongated with a maximum breadth of ~200 meters, one flatter side, and one more irregular side with a skewed hump. Additionally, we report on the model’s rotation state.

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