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Asteroid Near-Earth

2023 UO9

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(2023 UO9)

Where is it now

Distance from Sun
0.824 AU
True anomaly
94.02°
Distance from Earth
0.681 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 2023 UO9 — 0.824 AU from the Sun 2023 UO9
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2023 UO9 is 0.681 AU from Earth today (5.7 light-minutes).

In the sky

Right ascension
17h 25m 42s
Declination
-23° 36′ 41″
Constellation
Ophiuchus
Distance from Earth
0.68 AU
Elongation from the Sun
55.3° — 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
0.85 AU
Eccentricity
0.2101
Inclination
4.3°
Orbital period
286.1 days
Perihelion
0.671 AU
Aphelion
1.028 AU
Longitude of ascending node
348.77°
Argument of periapsis
260.87°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 21.2 LD
0.0546 AU
Tisserand (Jupiter)
6.912

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
41
Data arc
81 days
First observed
22 October 2023
Last observed
11 January 2024
Residual RMS
0.58 ″
Solution · Otto Matic
16 January 2024

Visual & observation

Absolute magnitude (H)
22.31

Discovery & classification

Aten Near-Earth Object

Close approaches 163 on record

Flyby geometry
Ecliptic flyby of 2023 UO9 at 2027-06-13 09:38 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-06-13 09:38 UTC close approach of 2023 UO9. Catalogue miss distance 135.2 LD · 5.2 × 10⁷ km. The curve is the geocentric path from 2027-06-10 to 2027-06-16, 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. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 135.2 LD · 5.2 × 10⁷ km 2027-06-13 09:38 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-06-13 09:38 UTC close approach of 2023 UO9. Catalogue miss distance 135.2 LD · 5.2 × 10⁷ km. The curve is the geocentric path from 2027-06-10 to 2027-06-16, 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. 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
2027-06-13 09:38:00 Earth 0.3473 AU 135.2 LD 10.5 km/s
2027-12-28 22:58:00 Earth 0.4952 AU 192.7 LD 21 km/s
2030-10-25 22:00:00 Earth 0.1217 AU 47.4 LD 8.9 km/s
2031-03-29 19:20:00 Earth 0.2691 AU 104.7 LD 7.1 km/s
2032-03-20 09:14:00 Venus 0.051 AU 19.8 LD 9.2 km/s
2034-07-29 16:03:00 Earth 0.2946 AU 114.6 LD 7.8 km/s
2035-01-10 11:20:00 Earth 0.1854 AU 72.1 LD 10.9 km/s
2037-07-12 01:47:00 Venus 0.1069 AU 41.6 LD 10.8 km/s
2037-11-06 09:52:00 Earth 0.4486 AU 174.6 LD 19.6 km/s
2038-05-20 22:12:00 Earth 0.3438 AU 133.8 LD 10.5 km/s

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

Sources