2021 UF1 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.74 AU to 1.31 AU from the Sun; one orbit takes 380 days. Orbit from the JPL solution of 13 November 2021.
Where is it now
- Distance from Sun
- 1.277 AU
- True anomaly
- 200.99°
- Distance from Earth
- 1.053 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
- 19h 51m 47s
- Declination
- -06° 51′ 20″
- Constellation
- Aquila
- Distance from Earth
- 1.06 AU
- Elongation from the Sun
- 77° — 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
- 1.027 AU
- Eccentricity
- 0.2754
- Inclination
- 14.9°
- Orbital period
- 380 days
- Perihelion
- 0.744 AU
- Aphelion
- 1.31 AU
- Longitude of ascending node
- 218.56°
- Argument of periapsis
- 288.17°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 11.8 LD
- 0.0304 AU
- Tisserand (Jupiter)
- 5.893
Orbit quality
Orbit poorly determined (uncertainty code 7).
- Observations used
- 70
- Data arc
- 19 days
- First observed
- 25 October 2021
- Last observed
- 13 November 2021
- Residual RMS
- 0.48 ″
- Solution · Otto Matic
- 13 November 2021
Visual & observation
- Absolute magnitude (H)
- 25.06
Discovery & classification
Close approaches 75 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-06-07 16:05 UTC close approach of 2021 UF1. Catalogue miss distance 130.8 LD · 5.03 × 10⁷ km. The curve is the geocentric path from 2027-06-04 to 2027-06-10, 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 |
|---|---|---|---|---|
| 2027-06-07 16:05:00 | Earth | 0.3361 AU | 130.8 LD | 18.9 km/s |
| 2038-10-18 14:10:00 | Venus | 0.1395 AU | 54.3 LD | 13.1 km/s |
| 2045-10-22 21:14:00 | Earth | 0.4071 AU | 158.4 LD | 21.6 km/s |
| 2046-11-01 23:34:00 | Earth | 0.1603 AU | 62.4 LD | 14.7 km/s |
| 2047-11-06 19:26:00 | Earth | 0.0972 AU | 37.8 LD | 9.2 km/s |
| 2052-05-01 08:36:00 | Venus | 0.1349 AU | 52.5 LD | 12.1 km/s |
| 2052-05-28 01:00:00 | Earth | 0.1905 AU | 74.2 LD | 14.7 km/s |
| 2053-06-11 22:04:00 | Earth | 0.4155 AU | 161.7 LD | 21.1 km/s |
| 2065-11-13 08:23:00 | Venus | 0.1403 AU | 54.6 LD | 11.6 km/s |
| 2071-10-27 21:52:00 | Earth | 0.3012 AU | 117.2 LD | 18.6 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