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Asteroid Near-Earth

2023 UO3

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(2023 UO3)

Where is it now

Distance from Sun
1.026 AU
True anomaly
136.97°
Distance from Earth
1.439 AU
As of
20 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 2023 UO3 — 1.026 AU from the Sun 2023 UO3
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2023 UO3 is 1.439 AU from Earth today (12.0 light-minutes).

In the sky

Right ascension
16h 49m 18s
Declination
-16° 10′ 30″
Constellation
Ophiuchus
Distance from Earth
1.44 AU
Elongation from the Sun
45.47° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
0.886 AU
Eccentricity
0.2797
Inclination
8.78°
Orbital period
304.4 days
Perihelion
0.638 AU
Aphelion
1.133 AU
Longitude of ascending node
211.75°
Argument of periapsis
307.89°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 1.9 LD
0.005 AU
Tisserand (Jupiter)
6.659

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
43
Data arc
2 days
First observed
19 October 2023
Last observed
21 October 2023
Residual RMS
0.4 ″
Solution · Otto Matic
30 October 2023

Visual & observation

Absolute magnitude (H)
25.78

Discovery & classification

Aten Near-Earth Object

Close approaches 82 on record

Flyby geometry
Ecliptic flyby of 2023 UO3 at 2028-04-07 18:11 UTC Top-down view of the ecliptic, Earth at the centre, for the 2028-04-07 18:11 UTC close approach of 2023 UO3. Catalogue miss distance 129.6 LD · 4.98 × 10⁷ km. The curve is the geocentric path from 2028-04-04 to 2028-04-10, 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. Sun 129.6 LD · 4.98 × 10⁷ km 2028-04-07 18:11 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2028-04-07 18:11 UTC close approach of 2023 UO3. Catalogue miss distance 129.6 LD · 4.98 × 10⁷ km. The curve is the geocentric path from 2028-04-04 to 2028-04-10, 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.

JPL Horizons

When (UTC) Body Distance Lunar distances Relative speed
2028-04-07 18:11:00 Earth 0.333 AU 129.6 LD 11.6 km/s
2028-10-23 17:12:00 Earth 0.0191 AU 7.4 LD 8.9 km/s
2030-08-04 00:15:00 Venus 0.1063 AU 41.4 LD 9.7 km/s
2032-07-28 08:20:00 Earth 0.4519 AU 175.9 LD 20.5 km/s
2033-03-27 14:11:00 Earth 0.3503 AU 136.3 LD 12.3 km/s
2033-04-11 04:46:00 Venus 0.0603 AU 23.5 LD 9.1 km/s
2033-10-22 09:24:00 Earth 0.1162 AU 45.2 LD 11.6 km/s
2037-07-23 14:55:00 Earth 0.3486 AU 135.7 LD 17.1 km/s
2038-03-12 11:48:00 Earth 0.3636 AU 141.5 LD 12.8 km/s
2038-10-18 18:56:00 Earth 0.2351 AU 91.5 LD 15.2 km/s

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

Sources