(54509) YORP Apollo
Discovered on 3 August 2000 by LINEAR at Socorro.
This naming collectively honors Ivan O. Yarkovsky, John A. O'Keefe, V. V. Radzievskij and Stephen J. Paddack, who were instrumental to the realization that radiation torques due to sunlight can affect the spin states of minor planets. Data on this object provided the first direct observational evidence for the YORP effect.Naming citation (20070402/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where YORP is today
Seen from above the solar system on 2026-10-14: YORP is 1.06 au from the Sun and 1.15 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 54509 |
| Provisional designation | 2000 PH5 |
| Orbit class | Apollo · near-Earth |
| Rotation period | 0.203 hours |
| Absolute magnitude (H) | 22.66 |
| Orbital period | 1.01 years |
| Semi-major axis | 1.01 au |
| Perihelion – aphelion | 0.775 – 1.24 au |
| Eccentricity | 0.230 |
| Inclination | 1.60° |
| Closest distance between its orbit and Earth's (MOID) | 0.000498 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Ivan
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- (8244) Mikolaichuk
- (8609) Shuvalov
- (9732) Juchnovski
- (9932) Kopylov
- (11003) Andronov
- (11191) Paskvic
- (12513) Niven
- (17002) Kouzel
- (20045) Semeniuk
- (20654) Ivaneder
- (20658) Bushmarinov
All asteroids named after someone called Ivan
Also discovered on 3 August 2000
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- (18924) Vinjamoori
- (36424) Satokokumasaki
- (38669) Michikawa
- (61342) Lovejoy
- (61344) Jicakyoryokutai
- (87271) Kokubunji