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Trans-Neptunian object

2025 OC343

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(2025 OC343)

Where is it now

Distance from Sun
41.747 AU
True anomaly
105.46°
Distance from Earth
41.104 AU
As of
17 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 2025 OC343 — 41.747 AU from the Sun 2025 OC343
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2025 OC343 is 41.104 AU from Earth today (5.7 light-hours).

In the sky

Right ascension
22h 21m 16s
Declination
-08° 30′ 10″
Constellation
Aquarius
Distance from Earth
41.12 AU
Elongation from the Sun
128.81° — 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
41.287 AU
Eccentricity
0.051
Inclination
17.18°
Orbital period
265.3 years
Perihelion
39.182 AU
Aphelion
43.392 AU
Longitude of ascending node
329.85°
Argument of periapsis
260.02°
Epoch · J2000
2460893.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,873.2 LD
38.2175 AU
Tisserand (Jupiter)
5.501

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 8).

Observations used
9
Data arc
58 days
First observed
18 July 2025
Last observed
14 September 2025
Residual RMS
0.38 ″
Solution · Otto Matic
9 September 2026

Visual & observation

Absolute magnitude (H)
7.14

Discovery & classification

TNO

Sources