2023 OY4 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.5 AU to 1.55 AU from the Sun; one orbit takes 377.9 days. Orbit from the JPL solution of 1 April 2024.
Where is it now
- Distance from Sun
- 0.516 AU
- True anomaly
- 333.3°
- Distance from Earth
- 0.525 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
- 14h 00m 32s
- Declination
- -30° 40′ 33″
- Constellation
- Centaurus
- Distance from Earth
- 0.53 AU
- Elongation from the Sun
- 17.51° — too close to the Sun to observe
Favours the southern hemisphere; low or below the horizon from far north.
From your location
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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
- 1.023 AU
- Eccentricity
- 0.514
- Inclination
- 17.81°
- Orbital period
- 377.9 days
- Perihelion
- 0.497 AU
- Aphelion
- 1.549 AU
- Longitude of ascending node
- 130.99°
- Argument of periapsis
- 298.64°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 2.9 LD
- 0.0075 AU
- Tisserand (Jupiter)
- 5.81
Orbit quality
Orbit poorly determined (uncertainty code 7).
- Observations used
- 34
- Data arc
- 5 days
- First observed
- 27 July 2023
- Last observed
- 1 August 2023
- Residual RMS
- 0.31 ″
- Solution · Otto Matic
- 1 April 2024
Visual & observation
- Absolute magnitude (H)
- 25.27
Discovery & classification
Close approaches 20 on record
Top-down view of the ecliptic, Earth at the centre, for the 2029-12-31 18:57 UTC close approach of 2023 OY4. Catalogue miss distance 184.0 LD · 7.07 × 10⁷ km. The curve is the geocentric path from 2029-12-28 to 2030-01-03, 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 |
|---|---|---|---|---|
| 2029-12-31 18:57:00 | Earth | 0.4728 AU | 184.0 LD | 21.2 km/s |
| 2034-03-29 02:25:00 | Earth | 0.3047 AU | 118.6 LD | 22.9 km/s |
| 2035-04-09 16:40:00 | Earth | 0.4595 AU | 178.8 LD | 28.8 km/s |
| 2059-01-08 18:50:00 | Venus | 0.1306 AU | 50.8 LD | 25.5 km/s |
| 2060-01-07 16:29:00 | Earth | 0.4555 AU | 177.3 LD | 20.4 km/s |
| 2061-02-01 00:08:00 | Earth | 0.3744 AU | 145.7 LD | 17 km/s |
| 2062-03-01 15:52:00 | Earth | 0.2704 AU | 105.2 LD | 15.3 km/s |
| 2063-03-21 00:25:00 | Earth | 0.2426 AU | 94.4 LD | 19.3 km/s |
| 2064-04-02 03:25:00 | Earth | 0.3591 AU | 139.8 LD | 25.1 km/s |
| 2066-02-02 19:19:00 | Venus | 0.0777 AU | 30.3 LD | 21.2 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB