Photometry and model of near-Earth asteroid 2021 DW1 from one apparition
- 1Faculty of Physics, Adam Mickiewicz University in Poznan, Poland
- 2Lowell Observatory, USA
- 3Astronomical Observatory of Odessa I.I.Mechnikov National University, Odessa, Ukraine
- 4Center for Space Situational Awareness, Korea Astronomy & Space Science Institute, South Korea
- 5Deok-Heong Optical Astronomy Observatory, South Korea
- 7Departamento de Física, Ingeniería ́ıa de Sistemas y Teoría de la Señal, Universidad de Alicante, Alicante, Spain
- 8Institut de Ciencies del Cosmos (ICCUB), Universitat de Barcelona, Barcelona, Spain
- 9Platanus Observatory, Lusówko (IAU K80), Poland
- 10"G.V.Schiaparelli" Astronomical Observatory, Varese, Italy
- 11Osservatorio di San Marcello Pistoiese, GAMP Gruppo Astrofili Montagna Pistoiese, Italy
- 12Great Shefford Observatory, Berkshire, United Kingdom
- 13British Astronomical Association, Burlington House, Piccadilly, London, United Kingdom
- 14Las Cumbres Observatory, Goleta, CA 93117, USA
2021 DW1 was discovered on 16 February 2021 by Pan-STARRS 1 on Haleakala. This ~40-m object passed the Earth at a distance of 570000 km (1.5 Lunar Distance) on 4 March at 9 UTC, reaching a brightness of V=14.6 mag. We observed it photometrically from 2 March, 4 UTC, when it was visible at V=16.5 mag, until 7 March, 9 UTC (V=18.2 mag). During that time 2021 DW1 swept a 170 deg long arc in the northern sky, spanning solar phase angles in the range from 36 to 86 deg. This made it an excellent target for physical characterization.
In our campaign, we used 9 telescopes with apertures ranging from 0.3-m to 1.2-m, located in the USA, UK, Spain, Italy, Poland, Ukraine, and South Korea. This gave us a good coverage of the asteroid path. We collected a lot of data which are now being analysed. Preliminary analysis show a very short rotation period of 50 seconds and a lightcurve amplitude of about 0.3 mag, which didn't change much along the asteroid path in the sky. More results will be presented at the conference.
How to cite: Kwiatkowski, T., Koleńczuk, P., Oszkiewicz, D., Troianskyi, V., Kryszczyńska, A., Kamiński, K., Kamińska, M., Skiff, B. A., Moskovitz, N. A., Kashuba, V., Kim, M.-J., Mottola, S., Santana-Ros, T., Kluwak, T., Buzzi, L., Bacci, P., Birtwhistle, P., Miles, R., and Chatelain, J.: Photometry and model of near-Earth asteroid 2021 DW1 from one apparition, Europlanet Science Congress 2021, online, 13–24 Sep 2021, EPSC2021-840, https://doi.org/10.5194/epsc2021-840, 2021.
