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Asteroid Near-Earth

23183

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23183 (2000 OY21)

Where is it now

Distance from Sun
2.548 AU
True anomaly
174.75°
Distance from Earth
3.23 AU
As of
11 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.

Orbit of Mercury Orbit of Venus Orbit of Mars Sun Earth — 0.998 AU from the Sun Earth 23183 — 2.548 AU from the Sun 23183
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 23183 is 3.23 AU from Earth today (26.9 light-minutes).

In the sky

Right ascension
15h 35m 27s
Declination
+09° 09′ 09″
Constellation
Serpens
Distance from Earth
3.23 AU
Elongation from the Sun
39.79° — near the Sun — look low at dusk or dawn

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
1.824 AU
Eccentricity
0.4009
Inclination
40.98°
Orbital period
899.7 days
Perihelion
1.093 AU
Aphelion
2.555 AU
Longitude of ascending node
119.63°
Argument of periapsis
301.48°
Epoch · J2000
2461200.5
Orbit class · AMO
Amor
Earth MOID · 99.8 LD
0.2565 AU
Tisserand (Jupiter)
3.672

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
1,525
Data arc
32.17 years
First observed
3 June 1994
Last observed
3 August 2026
Residual RMS
0.44 ″
Solution · Otto Matic
2 September 2026

Physical properties

Mean radius
0.55 km
Rotation period
6.98 hours

Visual & observation

Geometric albedo
0.64
Absolute magnitude (H)
16.06

Discovery & classification

Discovered by
McNaught, R. H.
Discovery date
28 July 2000
Discovery site
Siding Spring

Also known as 2000 OY21

Amor Near-Earth Object

Sources