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Trans-Neptunian object

2025 YC23

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(2025 YC23)

Where is it now

Distance from Sun
39.833 AU
True anomaly
92.6°
Distance from Earth
40.436 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 YC23 — 39.833 AU from the Sun 2025 YC23
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2025 YC23 is 40.436 AU from Earth today (5.6 light-hours).

In the sky

Right ascension
10h 06m 10s
Declination
+02° 21′ 52″
Constellation
Sextans
Distance from Earth
40.43 AU
Elongation from the Sun
52.51° — 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
40.094 AU
Eccentricity
0.1064
Inclination
20.18°
Orbital period
253.9 years
Perihelion
35.83 AU
Aphelion
44.359 AU
Longitude of ascending node
176.62°
Argument of periapsis
240.92°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Tisserand (Jupiter)
5.311

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
289
Data arc
119 days
First observed
17 December 2025
Last observed
15 April 2026
Residual RMS
0.15 ″

Visual & observation

Absolute magnitude (H)
6.81

Discovery & classification

TNO

Sources