2021 UH2 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 355 days. Orbit from the JPL solution of 26 February 2026.
Where is it now
- Distance from Sun
- 1.141 AU
- True anomaly
- 163.85°
- Distance from Earth
- 0.714 AU
- As of
- 2 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
- 09h 24m 03s
- Declination
- +15° 38′ 32″
- Constellation
- Leo
- Distance from Earth
- 0.71 AU
- Elongation from the Sun
- 82.32° — well clear of the Sun
Favours the northern hemisphere; low or below the horizon from far south.
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
- 0.981 AU
- Eccentricity
- 0.1723
- Inclination
- 0.28°
- Orbital period
- 355 days
- Perihelion
- 0.812 AU
- Aphelion
- 1.15 AU
- Longitude of ascending node
- 313.11°
- Argument of periapsis
- 321.69°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 1.2 LD
- 0.003 AU
- Tisserand (Jupiter)
- 6.158
Orbit quality
Orbit very well determined (uncertainty code 1).
- Observations used
- 146
- Data arc
- 4.33 years
- First observed
- 27 October 2021
- Last observed
- 25 February 2026
- Residual RMS
- 0.54 ″
- Solution · Otto Matic
- 26 February 2026
Physical properties
- Rotation period
- 3.8 hours
Visual & observation
- Absolute magnitude (H)
- 25.08
Discovery & classification
Close approaches 86 on record
Top-down view of the ecliptic, Earth at the centre, for the 2055-10-15 02:53 UTC close approach of 2021 UH2. Catalogue miss distance 10.7 LD · 4.13 × 10⁶ km. The curve is the geocentric path from 2055-10-12 to 2055-10-18, 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 |
|---|---|---|---|---|
| 2030-04-26 06:01:00 | Venus | 0.0952 AU | 37.0 LD | 2.4 km/s |
| 2048-10-05 11:50:00 | Venus | 0.0867 AU | 33.7 LD | 2.4 km/s |
| 2055-10-15 02:53:00 | Earth | 0.0276 AU | 10.7 LD | 6.4 km/s |
| 2056-09-12 07:39:00 | Earth | 0.127 AU | 49.4 LD | 3.3 km/s |
| 2056-11-08 02:21:00 | Earth | 0.1151 AU | 44.8 LD | 3.9 km/s |
| 2057-07-25 17:15:00 | Earth | 0.1902 AU | 74.0 LD | 5.9 km/s |
| 2057-12-18 05:41:00 | Earth | 0.1662 AU | 64.7 LD | 5 km/s |
| 2059-01-20 22:37:00 | Earth | 0.1546 AU | 60.2 LD | 4.7 km/s |
| 2059-05-17 00:04:00 | Earth | 0.1735 AU | 67.5 LD | 5.3 km/s |
| 2060-03-10 02:54:00 | Earth | 0.0637 AU | 24.8 LD | 3.8 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