2023 UN9 is an asteroid in the Aten orbit class. Its orbit takes it from 0.81 AU to 1.15 AU from the Sun; one orbit takes 352.9 days. Orbit from the JPL solution of 11 March 2026.
Where is it now
- Distance from Sun
- 1.129 AU
- True anomaly
- 157.77°
- Distance from Earth
- 0.443 AU
- As of
- 24 October 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
- 07h 44m 06s
- Declination
- +12° 39′ 42″
- Constellation
- Canis Minor
- Distance from Earth
- 0.44 AU
- Elongation from the Sun
- 95.99° — well clear of the Sun
Visible from both hemispheres.
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
- 0.977 AU
- Eccentricity
- 0.173
- Inclination
- 18.28°
- Orbital period
- 352.9 days
- Perihelion
- 0.808 AU
- Aphelion
- 1.146 AU
- Longitude of ascending node
- 64.43°
- Argument of periapsis
- 191.35°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 58.9 LD
- 0.1512 AU
- Tisserand (Jupiter)
- 6.135
Orbit quality
Orbit very well determined (uncertainty code 1).
- Observations used
- 394
- Data arc
- 4.97 years
- First observed
- 6 January 2021
- Last observed
- 27 December 2025
- Residual RMS
- 0.49 ″
- Solution · Otto Matic
- 11 March 2026
Visual & observation
- Absolute magnitude (H)
- 20.68
Discovery & classification
Close approaches 44 on record
Top-down view of the ecliptic, Earth at the centre, for the 2052-11-13 17:24 UTC close approach of 2023 UN9. Catalogue miss distance 62.5 LD · 2.4 × 10⁷ km. The curve is the geocentric path from 2052-11-10 to 2052-11-16, 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. At closest approach the object is south of the ecliptic. 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 |
|---|---|---|---|---|
| 2030-04-02 11:11:00 | Venus | 0.0868 AU | 33.8 LD | 9.3 km/s |
| 2037-01-07 21:44:00 | Venus | 0.09 AU | 35.0 LD | 9.5 km/s |
| 2043-10-16 06:31:00 | Venus | 0.1106 AU | 43.0 LD | 9.9 km/s |
| 2052-11-13 17:24:00 | Earth | 0.1606 AU | 62.5 LD | 10.3 km/s |
| 2053-11-30 18:01:00 | Earth | 0.1673 AU | 65.1 LD | 10 km/s |
| 2080-11-16 10:43:00 | Earth | 0.1539 AU | 59.9 LD | 10.2 km/s |
| 2081-12-03 19:41:00 | Earth | 0.1769 AU | 68.9 LD | 10 km/s |
| 2092-12-30 11:11:00 | Venus | 0.1129 AU | 43.9 LD | 9.3 km/s |
| 2099-10-08 03:50:00 | Venus | 0.0911 AU | 35.5 LD | 9.2 km/s |
| 2106-07-16 15:59:00 | Venus | 0.0866 AU | 33.7 LD | 9.4 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