2021 TP21
| Discovery[1] | |
|---|---|
| Discovered by | Mount Lemmon Survey |
| Discovery date | 11 October 2021 |
| Designations | |
| 2021 TP21 | |
| Orbital characteristics[2] | |
| Epoch2021-Jul-01 (JD2459396.5) | |
| Uncertainty parameter6 | |
| Observation arc | 57 days |
| Aphelion | 4.2274AU(Q) |
| Perihelion | 0.81425AU(q) |
| 2.5208 AU(a) | |
| Eccentricity | 0.67699(e) |
| 4.00 years | |
| 318.4°(M) | |
| Inclination | 25.404°(i) |
| 8.089°(Ω) | |
| 116.3°(ω) | |
| EarthMOID | 0.03 AU (4.5 million km) |
| JupiterMOID | 1.7 AU (250 million km) |
| Physical characteristics | |
| Dimensions |
|
| 20.2[2][4] | |
2021 TP21is anApophis-sized asteroid that was discovered on 11 October 2021 when it was 0.5AU(75 millionkm) from Earth.[1]Thispotentially hazardous asteroid(PHA) spends most or its orbit closer to 4 AU (600 million km) from the Sun as objects orbit more slowly when nearaphelion(furthest distance from the Sun).2021 TP21was rated with aTorino scaleof 1 from 31 October 2021 to 4 November 2021 for a potential impact on 27 March 2081.[3]As theobservation arcbecame longer thenominaldistance from Earth became further on the potential impact date.
| Observation arc (in days) |
JPL Horizons nominalgeocentric distance (AU) |
uncertainty region (3-sigma) |
Impact probability (1 in) |
Torino scale |
|---|---|---|---|---|
| 17 | 0.17AU(25 millionkm)[5] | ± 1.5billionkm[5] | 100000 | 0 |
| 19 | 1.4 AU (210 million km)[6] | ± 870 million km[6] | 50000[3] | 1[3] |
| 57 | 2.5 AU (370 million km)[7] | ± 18 million km[7] | 0 | 0 |
See also
[edit]References
[edit]- ^ab"MPEC 2021-U10: 2021 TP21".IAU Minor Planet Center. 17 October 2021.Retrieved6 November2021.(K21T21P)
- ^ab"JPL Small-Body Database Browser: (2021 TP21)".Jet Propulsion Laboratory.Retrieved6 November2021.
- ^abcd"(Archive 31 October 2021): ESA Risk-List".European Space Agency(ESA). Archived fromthe originalon 31 October 2021.
- ^"2021 TP21 Orbit".Minor Planet Center.Retrieved6 November2021.
- ^ab"JPL Horizons Archive: 2021 TP21 geocentric distance and uncertainty with 17 day arc".JPL Horizons. Archived fromthe originalon 30 October 2021.
- ^ab"JPL Horizons Archive: 2021 TP21 geocentric distance and uncertainty with 19 day arc".JPL Horizons. Archived fromthe originalon 30 October 2021.
- ^ab"JPL Horizons Archive: 2021 TP21 geocentric distance and uncertainty with 57 day arc".JPL Horizons. Archived fromthe originalon 6 November 2021.
External links
[edit]- 2021 TP21atNeoDyS-2, Near Earth Objects—Dynamic Site
- 2021 TP21atESA–space situational awareness
- 2021 TP21at theJPL Small-Body Database
