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Asteroid Near-Earth

2021 UG1

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(2021 UG1)

Where is it now

Distance from Sun
0.889 AU
True anomaly
251.13°
Distance from Earth
0.886 AU
As of
19 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.

Sun Earth — 0.996 AU from the Sun Earth 2021 UG1 — 0.889 AU from the Sun 2021 UG1
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 UG1 is 0.886 AU from Earth today (7.4 light-minutes).

In the sky

Right ascension
10h 29m 39s
Declination
+19° 03′ 43″
Constellation
Leo
Distance from Earth
0.89 AU
Elongation from the Sun
55.73° — near the Sun — look low at dusk or dawn

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.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

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
0.867 AU
Eccentricity
0.2095
Inclination
12.31°
Orbital period
294.6 days
Perihelion
0.685 AU
Aphelion
1.048 AU
Longitude of ascending node
36.55°
Argument of periapsis
154.62°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 9.9 LD
0.0255 AU
Tisserand (Jupiter)
6.784

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
126
Data arc
12 days
First observed
25 October 2021
Last observed
6 November 2021
Residual RMS
0.56 ″
Solution · Otto Matic
23 February 2022

Visual & observation

Absolute magnitude (H)
25.16

Discovery & classification

Aten Near-Earth Object

Close approaches 100 on record

Flyby geometry
Ecliptic flyby of 2021 UG1 at 2029-09-11 18:37 UTC Top-down view of the ecliptic, Earth at the centre, for the 2029-09-11 18:37 UTC close approach of 2021 UG1. Catalogue miss distance 112.4 LD · 4.32 × 10⁷ km. The curve is the geocentric path from 2029-09-08 to 2029-09-14, 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. Sun 112.4 LD · 4.32 × 10⁷ km 2029-09-11 18:37 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2029-09-11 18:37 UTC close approach of 2021 UG1. Catalogue miss distance 112.4 LD · 4.32 × 10⁷ km. The curve is the geocentric path from 2029-09-08 to 2029-09-14, 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.

JPL Horizons

When (UTC) Body Distance Lunar distances Relative speed
2029-09-11 18:37:00 Earth 0.2887 AU 112.4 LD 11.7 km/s
2030-03-05 09:41:00 Earth 0.3258 AU 126.8 LD 10.3 km/s
2032-09-06 11:51:00 Venus 0.0682 AU 26.6 LD 9.1 km/s
2033-09-13 12:31:00 Earth 0.4654 AU 181.1 LD 18.1 km/s
2034-04-04 18:11:00 Earth 0.3217 AU 125.2 LD 12 km/s
2038-05-03 23:45:00 Earth 0.305 AU 118.7 LD 11.6 km/s
2038-11-06 03:16:00 Earth 0.3032 AU 118.0 LD 15 km/s
2042-06-04 00:43:00 Earth 0.283 AU 110.1 LD 9.6 km/s
2042-11-08 01:15:00 Earth 0.1005 AU 39.1 LD 9.3 km/s
2045-08-01 18:00:00 Venus 0.0423 AU 16.5 LD 8.2 km/s

Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.

Sources