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Trans-Neptunian object

2025 MX397

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(2025 MX397)

Where is it now

Distance from Sun
46.001 AU
True anomaly
107.07°
Distance from Earth
46.639 AU
As of
22 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 — 0.995 AU from the Sun Earth 2025 MX397 — 46.001 AU from the Sun 2025 MX397
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2025 MX397 is 46.639 AU from Earth today (6.5 light-hours).

In the sky

Right ascension
17h 12m 38s
Declination
-13° 46′ 41″
Constellation
Ophiuchus
Distance from Earth
46.64 AU
Elongation from the Sun
49.24° — 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
45.496 AU
Eccentricity
0.253
Inclination
26.06°
Orbital period
306.9 years
Perihelion
33.987 AU
Aphelion
57.006 AU
Longitude of ascending node
98.89°
Argument of periapsis
51.31°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Tisserand (Jupiter)
5.254

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 9).

Observations used
14
Data arc
20 days
First observed
24 June 2025
Last observed
14 July 2025
Residual RMS
0.12 ″

Visual & observation

Absolute magnitude (H)
5.79

Discovery & classification

TNO

Sources