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Asteroid Near-Earth

2023 UN9

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(2023 UN9)

Where is it now

Distance from Sun
1.129 AU
True anomaly
157.77°
Distance from Earth
0.443 AU
As of
24 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 — 0.994 AU from the Sun Earth 2023 UN9 — 1.129 AU from the Sun 2023 UN9
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2023 UN9 is 0.443 AU from Earth today (3.7 light-minutes).

In the sky

Right ascension
07h 44m 00s
Declination
+12° 38′ 40″
Constellation
Canis Minor
Distance from Earth
0.44 AU
Elongation from the Sun
95.97° — 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.

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
0.977 AU
Eccentricity
0.173
Inclination
18.28°
Orbital period
352.9 days
Perihelion
0.808 AU
Aphelion
1.146 AU
Longitude of ascending node
64.43°
Argument of periapsis
191.35°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 58.9 LD
0.1512 AU
Tisserand (Jupiter)
6.135

Orbit quality

Orbit very well determined (uncertainty code 1).

Observations used
394
Data arc
4.97 years
First observed
6 January 2021
Last observed
27 December 2025
Residual RMS
0.49 ″
Solution · Otto Matic
11 March 2026

Visual & observation

Absolute magnitude (H)
20.68

Discovery & classification

Aten Near-Earth Object

Close approaches 44 on record

Flyby geometry
Ecliptic flyby of 2023 UN9 at 2052-11-13 17:24 UTC Top-down view of the ecliptic, Earth at the centre, for the 2052-11-13 17:24 UTC close approach of 2023 UN9. Catalogue miss distance 62.5 LD · 2.4 × 10⁷ km. The curve is the geocentric path from 2052-11-10 to 2052-11-16, 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 62.5 LD · 2.4 × 10⁷ km 2052-11-13 17:24 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2052-11-13 17:24 UTC close approach of 2023 UN9. Catalogue miss distance 62.5 LD · 2.4 × 10⁷ km. The curve is the geocentric path from 2052-11-10 to 2052-11-16, 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
2030-04-02 11:11:00 Venus 0.0868 AU 33.8 LD 9.3 km/s
2037-01-07 21:44:00 Venus 0.09 AU 35.0 LD 9.5 km/s
2043-10-16 06:31:00 Venus 0.1106 AU 43.0 LD 9.9 km/s
2052-11-13 17:24:00 Earth 0.1606 AU 62.5 LD 10.3 km/s
2053-11-30 18:01:00 Earth 0.1673 AU 65.1 LD 10 km/s
2080-11-16 10:43:00 Earth 0.1539 AU 59.9 LD 10.2 km/s
2081-12-03 19:41:00 Earth 0.1769 AU 68.9 LD 10 km/s
2092-12-30 11:11:00 Venus 0.1129 AU 43.9 LD 9.3 km/s
2099-10-08 03:50:00 Venus 0.0911 AU 35.5 LD 9.2 km/s
2106-07-16 15:59:00 Venus 0.0866 AU 33.7 LD 9.4 km/s

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

Sources