2023 OS is an asteroid in the Apollo orbit class. Its orbit takes it from 0.9 AU to 1.16 AU from the Sun; one orbit takes 383 days. Orbit from the JPL solution of 21 January 2025.
Where is it now
- Distance from Sun
- 0.923 AU
- True anomaly
- 324.26°
- Distance from Earth
- 0.854 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 50m 23s
- Declination
- -41° 05′ 13″
- Constellation
- Corona Australis
- Distance from Earth
- 0.85 AU
- Elongation from the Sun
- 59.45° — 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
- 1.032 AU
- Eccentricity
- 0.1242
- Inclination
- 20.24°
- Orbital period
- 383 days
- Perihelion
- 0.904 AU
- Aphelion
- 1.16 AU
- Longitude of ascending node
- 117.23°
- Argument of periapsis
- 270.61°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 0.5 LD
- 0.0012 AU
- Tisserand (Jupiter)
- 5.87
Orbit quality
Orbit very well determined (uncertainty code 2).
- Observations used
- 141
- Data arc
- 552 days
- First observed
- 18 July 2023
- Last observed
- 20 January 2025
- Residual RMS
- 0.37 ″
- Solution · Otto Matic
- 21 January 2025
Visual & observation
- Absolute magnitude (H)
- 24.4
Discovery & classification
Close approaches 31 on record
Top-down view of the ecliptic, Earth at the centre, for the 2044-07-14 08:02 UTC close approach of 2023 OS. Catalogue miss distance 57.5 LD · 2.21 × 10⁷ km. The curve is the geocentric path from 2044-07-11 to 2044-07-17, 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 |
|---|---|---|---|---|
| 2044-07-14 08:02:00 | Earth | 0.1476 AU | 57.5 LD | 13 km/s |
| 2045-07-24 21:09:00 | Earth | 0.1473 AU | 57.3 LD | 10.3 km/s |
| 2047-01-18 06:03:00 | Earth | 0.1041 AU | 40.5 LD | 12.4 km/s |
| 2066-07-20 22:24:00 | Earth | 0.0143 AU | 5.6 LD | 10.8 km/s |
| 2068-01-16 12:31:00 | Earth | 0.0333 AU | 13.0 LD | 11.1 km/s |
| 2086-07-19 17:17:00 | Earth | 0.0206 AU | 8.0 LD | 11.1 km/s |
| 2088-01-16 05:38:00 | Earth | 0.0666 AU | 25.9 LD | 10.7 km/s |
| 2107-07-17 15:40:00 | Earth | 0.1094 AU | 42.6 LD | 12.4 km/s |
| 2108-07-26 16:27:00 | Earth | 0.1879 AU | 73.1 LD | 10.5 km/s |
| 2109-01-16 17:58:00 | Earth | 0.1582 AU | 61.6 LD | 10.6 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