Agata Rożek
Optical Monitoring of the Didymos–Dimorphos Asteroid System with the Danish Telescope around the DART Mission Impact
Rożek, Agata; Snodgrass, Colin; Jørgensen, Uffe G.; Pravec, Petr; Bonavita, Mariangela; Rabus, Markus; Khalouei, Elahe; Longa-Peña, Penélope; Burgdorf, Martin J.; Donaldson, Abbie; Gardener, Daniel; Crake, Dennis; Sajadian, Sedighe; Bozza, Valerio; Skottfelt, Jesper; Dominik, Martin; Fynbo, J.; Hinse, Tobias C.; Hundertmark, Markus; Rahvar, Sohrab; Southworth, John; Tregloan-Reed, Jeremy; Kretlow, Mike; Rota, Paolo; Peixinho, Nuno; Andersen, Michael; Amadio, Flavia; Barrios-López, Daniela; Castillo Baeza, Nora Soledad
Authors
Colin Snodgrass
Uffe G. Jørgensen
Petr Pravec
Mariangela Bonavita
Markus Rabus
Elahe Khalouei
Penélope Longa-Peña
Martin J. Burgdorf
Abbie Donaldson
Daniel Gardener
Dennis Crake
Sedighe Sajadian
Valerio Bozza
Jesper Skottfelt
Martin Dominik
J. Fynbo
Tobias C. Hinse
Markus Hundertmark
Sohrab Rahvar
Dr John Taylor j.k.taylor@keele.ac.uk
Jeremy Tregloan-Reed
Mike Kretlow
Paolo Rota
Nuno Peixinho
Michael Andersen
Flavia Amadio
Daniela Barrios-López
Nora Soledad Castillo Baeza
Abstract
The NASA’s Double-Asteroid Redirection Test (DART) was a unique planetary defence and technology test mission, the first of its kind. The main spacecraft of the DART mission impacted the target asteroid Dimorphos, a small moon orbiting the asteroid Didymos (65803), on 2022 September 26. The impact brought up a mass of ejecta which, together with the direct momentum transfer from the collision, caused an orbital period change of 33 ± 1 minutes, as measured by ground-based observations. We report here the outcome of the optical monitoring campaign of the Didymos system from the Danish 1.54 m telescope at La Silla around the time of impact. The observations contributed to the determination of the changes in the orbital parameters of the Didymos–Dimorphos system, as reported by Thomas et al., but in this paper we focus on the ejecta produced by the DART impact. We present photometric measurements from which we remove the contribution from the Didymos–Dimorphos system using an H–G photometric model. Using two photometric apertures we determine the fading rate of the ejecta to be 0.115 ± 0.003 mag day−1 (in a 2″ aperture) and 0.086 ± 0.003 mag day−1 (5″) over the first week postimpact. After about 8 days postimpact we note the fading slows down to 0.057 ± 0.003 mag day−1 (2″ aperture) and 0.068 ± 0.002 mag day−1 (5″). We include deep-stacked images of the system to illustrate the ejecta evolution during the first 18 days, noting the emergence of dust tails formed from ejecta pushed in the antisolar direction, and measuring the extent of the particles ejected Sunward to be at least 4000 km.
Citation
Rożek, A., Snodgrass, C., Jørgensen, U. G., Pravec, P., Bonavita, M., Rabus, M., …Castillo Baeza, N. S. (2023). Optical Monitoring of the Didymos–Dimorphos Asteroid System with the Danish Telescope around the DART Mission Impact. The Planetary Science Journal, 4(12), Article 236. https://doi.org/10.3847/psj/ad0a64
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 3, 2023 |
Online Publication Date | Dec 12, 2023 |
Publication Date | Dec 1, 2023 |
Deposit Date | Dec 18, 2023 |
Journal | The Planetary Science Journal |
Electronic ISSN | 2632-3338 |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 4 |
Issue | 12 |
Article Number | 236 |
DOI | https://doi.org/10.3847/psj/ad0a64 |
Keywords | Planetary probes, Asteroid satellites, Light curves, Apollo group |
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