2019 UM9 is an asteroid in the Aten orbit class. Its orbit takes it from 0.83 AU to 1.14 AU from the Sun; one orbit takes 357.7 days. Orbit from the JPL solution of 15 April 2021.
Where is it now
- Distance from Sun
- 0.858 AU
- True anomaly
- 321.64°
- Distance from Earth
- 0.924 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
- 11h 35m 45s
- Declination
- +14° 04′ 52″
- Constellation
- Leo
- Distance from Earth
- 0.93 AU
- Elongation from the Sun
- 52.92° — near the Sun — look low at dusk or dawn
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
- 0.986 AU
- Eccentricity
- 0.155
- Inclination
- 12.36°
- Orbital period
- 357.7 days
- Perihelion
- 0.833 AU
- Aphelion
- 1.139 AU
- Longitude of ascending node
- 33.16°
- Argument of periapsis
- 104.77°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 2.4 LD
- 0.0062 AU
- Tisserand (Jupiter)
- 6.117
Orbit quality
Orbit reasonably well determined (uncertainty code 5).
- Observations used
- 81
- Data arc
- 2 days
- First observed
- 27 October 2019
- Last observed
- 29 October 2019
- Residual RMS
- 0.53 ″
- Solution · Otto Matic
- 15 April 2021
Visual & observation
- Absolute magnitude (H)
- 27.3
Discovery & classification
Close approaches 49 on record
Top-down view of the ecliptic, Earth at the centre, for the 2059-06-09 19:08 UTC close approach of 2019 UM9. Catalogue miss distance 189.1 LD · 7.27 × 10⁷ km. The curve is the geocentric path from 2059-06-06 to 2059-06-12, 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 |
|---|---|---|---|---|
| 2059-06-09 19:08:00 | Earth | 0.4859 AU | 189.1 LD | 19.3 km/s |
| 2060-06-01 20:30:00 | Earth | 0.3654 AU | 142.2 LD | 15.9 km/s |
| 2061-05-25 02:52:00 | Earth | 0.2463 AU | 95.9 LD | 12.7 km/s |
| 2062-05-15 22:47:00 | Earth | 0.1345 AU | 52.4 LD | 9.8 km/s |
| 2063-05-03 21:13:00 | Earth | 0.0687 AU | 26.7 LD | 7.8 km/s |
| 2064-04-14 02:30:00 | Earth | 0.1288 AU | 50.1 LD | 7 km/s |
| 2065-03-14 00:10:00 | Earth | 0.2099 AU | 81.7 LD | 6.8 km/s |
| 2065-10-03 06:45:00 | Earth | 0.2147 AU | 83.6 LD | 6.4 km/s |
| 2066-10-26 11:43:00 | Earth | 0.1037 AU | 40.4 LD | 6.5 km/s |
| 2067-10-27 22:03:00 | Earth | 0.0175 AU | 6.8 LD | 7.9 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