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Trans-Neptunian object

2025 OY343

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(2025 OY343)

Where is it now

Distance from Sun
33.283 AU
True anomaly
274.38°
Distance from Earth
32.474 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 OY343 — 33.283 AU from the Sun 2025 OY343
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2025 OY343 is 32.474 AU from Earth today (4.5 light-hours).

In the sky

Right ascension
23h 22m 00s
Declination
-07° 43′ 41″
Constellation
Aquarius
Distance from Earth
32.48 AU
Elongation from the Sun
143.24° — 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
40.564 AU
Eccentricity
0.3935
Inclination
32.71°
Orbital period
258.4 years
Perihelion
24.601 AU
Aphelion
56.526 AU
Longitude of ascending node
164.17°
Argument of periapsis
271.67°
Epoch · J2000
2460901.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 9,253.8 LD
23.7781 AU
Tisserand (Jupiter)
4.448

Orbit quality

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

Observations used
12
Data arc
41 days
First observed
19 July 2025
Last observed
29 August 2025
Residual RMS
0.36 ″
Solution · Otto Matic
9 September 2026

Visual & observation

Absolute magnitude (H)
7.59

Discovery & classification

TNO

Sources