594913 ꞌAylóꞌchaxnim
594913 ꞌAylóꞌchaxnim (provisional designation 2020 AV2) is a large near-Earth asteroid discovered by the Zwicky Transient Facility on 4 January 2020. It is the first asteroid discovered to have an orbit completely within Venus's orbit, and is thus the first and only known member of the eponymous ꞌAylóꞌchaxnim (informally named Vatira before its discovery) population of Atira-class asteroids. ꞌAylóꞌchaxnim has the smallest known aphelion and third-smallest known semi-major axis among all asteroids. With an absolute magnitude approximately 16.2, the asteroid is expected to be larger than 1 km in diameter.
Long-exposure composite image of ꞌAylóꞌchaxnim (center) | |||||||||
| Discovery | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Discovered by | Zwicky Transient Facility | ||||||||
| Discovery site | Palomar Obs. | ||||||||
| Discovery date | 4 January 2020 | ||||||||
| Designations | |||||||||
MPC designation | (594913) ꞌAylóꞌchaxnim | ||||||||
| Pronunciation | /aɪˈlɒʔtʃæxnɪm/ Luiseño: [ʔajˈlɔʔt͜ʃaxnɪm] | ||||||||
Alternative designations | 2020 AV2 · ZTF09k5 | ||||||||
Minor planet category | Vatira · Atira · NEO | ||||||||
| Orbital characteristics | |||||||||
| Epoch 1 July 2021 (JD 2459396.5) | |||||||||
| Uncertainty parameter 2 | |||||||||
| Observation arc | 1.67 yr (609 days) | ||||||||
| Aphelion | 0.6538 AU | ||||||||
| Perihelion | 0.4571 AU | ||||||||
Semi-major axis | 0.5554 AU | ||||||||
| Eccentricity | 0.17701 | ||||||||
Orbital period (sidereal) | 0.41 yr (151.2 d) | ||||||||
Mean anomaly | 85.295° | ||||||||
Mean motion | 2° 22m 51.424s / day | ||||||||
| Inclination | 15.868° | ||||||||
Longitude of ascending node | 6.706° | ||||||||
| 187.330° | |||||||||
| Earth MOID | 0.34694 AU (51.9 million km) | ||||||||
| Mercury MOID | 0.06561 AU | ||||||||
| Venus MOID | 0.07896 AU | ||||||||
| Physical characteristics | |||||||||
Mean diameter | 1.7+0.6 −0.6 km | ||||||||
| 0.22 (assumed for S-type asteroids) | |||||||||
| |||||||||
| Sa | |||||||||
| 18.0 | |||||||||
| 16.17±0.78 | |||||||||
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