2021 DW1 is a small Apollo near-Earth asteroid discovered on 16 February 2021 by the Pan-STARRS 1 survey at Haleakala Observatory, Hawaii.[2] On 4 March 2021 at 8:59 UTC, it passed 1.48 LD (570,000 km; 350,000 mi) from Earth. During the close approach, it trailed across the Northern Hemisphere sky and brightened up to apparent magnitude of 14.6. Extensive observations of 2021 DW1 during the encounter revealed that it is an elongated, stony asteroid approximately 30 metres (100 ft) in diameter, with a rapid rotation period of 50 seconds. The asteroid's spin axis is unusually oblique relative to its orbital plane, contrary to predictions from the YORP effect.[5]
| Discovery [1][2] | |
|---|---|
| Discovered by | Pan-STARRS 1 |
| Discovery site | Haleakala Obs. |
| Discovery date | 16 February 2021 |
| Designations | |
| 2021 DW1 | |
| P11dqY3 [3] | |
| NEO · Apollo [4] | |
| Orbital characteristics [4] | |
| Epoch 1 July 2020 (JD 2459396.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 27 days |
| Aphelion | 1.662 AU |
| Perihelion | 0.9918 AU |
| 1.327 AU | |
| Eccentricity | 0.2525 |
| 1.53 yr (558.29 days) | |
| 71.096° | |
| 0° 38m 41.367s / day | |
| Inclination | 6.878° |
| 162.489° | |
| 10.499° | |
| Earth MOID | 0.00414 AU (619,000 km) |
| Physical characteristics | |
| 30±10 m [5] | |
| 0.013760±0.000001 h [5] 49.536±0.004 s | |
| 54°±10° or 123°±10° (to orbit) [5] | |
Pole ecliptic latitude | 29°±10° or −40°±10° [5] |
Pole ecliptic longitude | 57°±10° or 67°±10° [5] |
| 0.23±0.02 [5] | |
| Sq [5] g–i=0.79±0.01 [5] i–z=0.01±0.02 z–g=0.01±0.02 [5] | |
| 21.0 (discovery) [2] 14.6 (max) [5] | |
| 24.8±0.5 [5] · 25.02±0.27 [4][1] | |
References
edit- ^ a b "2021 DW1". Minor Planet Center. International Astronomical Union. Retrieved 11 October 2021.
- ^ a b c "MPEC 2021-D73 : 2021 DW1". Minor Planet Electronic Circular. Minor Planet Center. 21 February 2021. Retrieved 11 October 2021.
- ^ "2021 DW1". NEO Exchange. Las Cumbres Observatory. 29 September 2021. Retrieved 11 October 2021.
- ^ a b c "JPL Small-Body Database Browser: (2021 DW1)" (2021-03-15 last obs.). Jet Propulsion Laboratory. Retrieved 11 October 2021.
- ^ a b c d e f g h i j k l Kwiatkowski, T.; Koleńczuk, P.; Kryszczyńska, A.; Oszkiewicz, D.; Kamiński, K.; Kamińska, M. K.; et al. (23 September 2021). "Photometry and model of near-Earth asteroid 2021 DW1 from one apparition". Astronomy & Astrophysics. 656: A126. arXiv:2109.11689. Bibcode:2021A&A...656A.126K. doi:10.1051/0004-6361/202142013. S2CID 245019975.
External links
edit- Near-Earth asteroid 2021 DW1 very close encounter: an image – 03 Mar. 2021, Gianluca Masi, Virtual Telescope Project, 4 March 2021
- 2021 DW1 at NeoDyS-2, Near Earth Objects—Dynamic Site
- 2021 DW1 at ESA–space situational awareness
- 2021 DW1 at the JPL Small-Body Database
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