2021 DW1
Asteroid
From Wikipedia, the free encyclopedia
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]
an image taken of 2021 DW1 on the 3rd of march, 2021 | |
| 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 longitude | 57°±10° or 67°±10°[5] |
Pole ecliptic latitude | 29°±10° or −40°±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] | |
A lightcurve study made by the Harvard University, shows that 2021 DW1 may be a contact binary[6].
