Asteroids 4092 Tyr (Follow Up, Analysis, Preliminary Results) and 699 Hela (Spin-Shape Model)
Abstract
In this work we present the results of the photometric follow up of the asteroid 4092 Tyr carried out by the Grupo de Observadores de Asteroides throughout the months of 2020 August and September. The rotation period derived from the observations is P = 16.091 ± 0.003 h. Furthermore, 4092 Tyr has been revealed to be a synchronous binary asteroid with two main bodies of similar size. We also present a confirmation of the rotation period of the asteroid 699 Hela (0.1415100 ± 0.0000024 d), and a study of its shape and spin. We analyze dense lightcurves acquired in 2020 by the Grupo de Observadores de Asteroides, as well as those available in public databases. We have also used sparse lightcurves from USNO (Flagstaff) and the TESS mission. We find two possible solutions for the spin axis (λ1, β1) = (37°, +51°), (λ2, β2) = (189°, +14°), in agreement with previously published models.
- Publication:
-
Minor Planet Bulletin
- Pub Date:
- April 2021
- Bibcode:
- 2021MPBu...48..136A
- Keywords:
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- Minor Planets;
- Asteroids;
- Light Curves;
- Photometry;
- Periods