2026 UM is an asteroid in the Aten orbit class. Its orbit takes it from 0.31 AU to 1.11 AU from the Sun; one orbit takes 217.6 days. Orbit from the JPL solution of 23 October 2026.
Where is it now
- Distance from Sun
- 1.064 AU
- True anomaly
- 194.56°
- Distance from Earth
- 0.653 AU
- As of
- 25 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
- 18h 29m 14s
- Declination
- +31° 10′ 11″
- Constellation
- Lyra
- Distance from Earth
- 0.65 AU
- Elongation from the Sun
- 77.32° — 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
- 0.708 AU
- Eccentricity
- 0.5662
- Inclination
- 47.92°
- Orbital period
- 217.6 days
- Perihelion
- 0.307 AU
- Aphelion
- 1.109 AU
- Longitude of ascending node
- 221.67°
- Argument of periapsis
- 302.92°
- Epoch · J2000
- 2461330.5
- Orbit class · ATE
- Aten
- Earth MOID · 92.1 LD
- 0.2368 AU
- Tisserand (Jupiter)
- 7.756
Orbit quality
Orbit very uncertain — the object may be effectively lost (uncertainty code 8).
- Observations used
- 22
- Data arc
- 6 days
- First observed
- 16 October 2026
- Last observed
- 22 October 2026
- Residual RMS
- 0.37 ″
- Solution · Otto Matic
- 23 October 2026
Visual & observation
- Absolute magnitude (H)
- 19.53
Discovery & classification
Close approaches 5 on record
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2027-08-31 07:29:00 | Merc | 0.0827 AU | 32.2 LD | 47.5 km/s |
| 2027-08-31 20:05:00 | Mercury | 0.0761 AU | 29.6 LD | 47.3 km/s |
| 2029-12-01 19:41:00 | Venus | 0.1478 AU | 57.5 LD | 30.6 km/s |
| 2030-07-11 00:32:00 | Venus | 0.0408 AU | 15.9 LD | 34.1 km/s |
| 2031-02-16 12:09:00 | Venus | 0.1141 AU | 44.4 LD | 38.4 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