YORP is an asteroid in the Apollo orbit class. Its orbit takes it from 0.77 AU to 1.24 AU from the Sun; one orbit takes 368.5 days. Discovered 3 August 2000 by LINEAR. Orbit from the JPL solution of 20 December 2022.
Where is it now
- Distance from Sun
- 1.123 AU
- True anomaly
- 131.37°
- Distance from Earth
- 1.26 AU
- As of
- 3 November 2026
Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.
In the sky
- Right ascension
- 18h 42m 34s
- Declination
- -21° 58′ 35″
- Constellation
- Sagittarius
- Distance from Earth
- 1.26 AU
- Elongation from the Sun
- 58.42° — near the Sun — look low at dusk or dawn
Favours the southern hemisphere; low or below the horizon from far north.
From your location
See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.
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Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.
Orbital elements
- Semi-major axis
- 1.006 AU
- Eccentricity
- 0.23
- Inclination
- 1.6°
- Orbital period
- 368.5 days
- Perihelion
- 0.775 AU
- Aphelion
- 1.237 AU
- Longitude of ascending node
- 278.18°
- Argument of periapsis
- 278.99°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 0.2 LD
- 0.0005 AU
- Tisserand (Jupiter)
- 6.028
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 550
- Data arc
- 5 years
- First observed
- 3 August 2000
- Last observed
- 3 August 2005
- Residual RMS
- 0.39 ″
- Solution · Otto Matic
- 20 December 2022
Physical properties
- Rotation period
- 0.2 hours
Visual & observation
- Absolute magnitude (H)
- 22.66
Discovery & classification
- Discovered by
- LINEAR
- Discovery date
- 3 August 2000
- Discovery site
- 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.
Also known as 54509 · 2000 PH5
Close approaches 115 on record
Top-down view of the ecliptic, Earth at the centre, for the 2094-12-13 10:54 UTC close approach of YORP. Catalogue miss distance 176.0 LD · 6.77 × 10⁷ km. The curve is the geocentric path from 2094-12-10 to 2094-12-16, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate.
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2029-08-01 06:37:00 | Venus | 0.0819 AU | 31.9 LD | 4.2 km/s |
| 2054-10-21 18:12:00 | Venus | 0.0764 AU | 29.7 LD | 3.2 km/s |
| 2065-11-20 00:26:00 | Venus | 0.1425 AU | 55.5 LD | 7.6 km/s |
| 2080-01-12 20:53:00 | Venus | 0.0996 AU | 38.8 LD | 3 km/s |
| 2091-02-09 11:27:00 | Venus | 0.1402 AU | 54.6 LD | 7.4 km/s |
| 2094-12-13 10:54:00 | Earth | 0.4522 AU | 176.0 LD | 20.8 km/s |
| 2095-12-16 03:24:00 | Earth | 0.3966 AU | 154.4 LD | 19.1 km/s |
| 2096-12-17 21:04:00 | Earth | 0.341 AU | 132.7 LD | 17.4 km/s |
| 2097-12-20 10:31:00 | Earth | 0.2859 AU | 111.2 LD | 15.7 km/s |
| 2098-12-23 02:23:00 | Earth | 0.2312 AU | 90.0 LD | 14 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- physical properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB