V band photometry of asteroids from the All-Sky Automated Survey for Supernovae

Abstract

<p>The All-Sky Automated Survey for Supernovae (ASAS-SN) currently<br />operates 24 small-aperture telescopes distributed around the globe to<br />automatically survey the entire visible sky every night down to about<br />g~18 mag. Between 2013 and 2018, the survey used a V filter with<br />limiting magnitude V~17. Although primarily hunting for supernovae and<br />other transients, asteroids are common intruders in the ASAS-SN's<br />images. Here we present efforts to analyze the sparsely sampled V-band<br />photometry extracted from the ASAS-SN images for >10,000 asteroids<br />that get brighter than V~17 mag. The data span years 2013-2018 and<br />sample up to 7 consequent apparitions for each asteroid. We provide<span class="im"><br />details about the photometry extraction and calibration, photometry<br />accuracy, and various statistics such as the typical number of data<br />points per asteroid as a function of the brightness. Finally, we<br /></span> analyze the photometric data with the lightcurve inversion method and<br />derive rotation periods, spin axis directions, and shapes for a sample<span class="im"><br />of studied asteroids. We discuss the typical amount of data sufficient<br />for a successful shape model determination. We compare derived<br />physical properties with those available in the literature to<br /></span> illustrate the reliability of the ASAS-SN photometry.</p>