2025 ME399 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 29.57 AU to 62.69 AU from the Sun; one orbit takes 313.3 years.
Where is it now
- Distance from Sun
- 40.008 AU
- True anomaly
- 270.71°
- Distance from Earth
- 40.84 AU
- As of
- 24 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.
In the sky
- Right ascension
- 16h 05m 12s
- Declination
- -24° 29′ 12″
- Constellation
- Scorpius
- Distance from Earth
- 40.84 AU
- Elongation from the Sun
- 32.55° — near the Sun — look low at dusk or dawn
Favours the southern hemisphere; low or below the horizon from far north.
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.
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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
- 46.13 AU
- Eccentricity
- 0.3589
- Inclination
- 19.5°
- Orbital period
- 313.3 years
- Perihelion
- 29.573 AU
- Aphelion
- 62.686 AU
- Longitude of ascending node
- 54.35°
- Argument of periapsis
- 280.35°
- Epoch · J2000
- 2461200.5
- Orbit class · TNO
- Trans-Neptunian object
- Tisserand (Jupiter)
- 5.352
Orbit quality
Orbit very uncertain — the object may be effectively lost (uncertainty code 9).
- Observations used
- 11
- Data arc
- 29 days
- First observed
- 21 June 2025
- Last observed
- 20 July 2025
- Residual RMS
- 0.18 ″
Visual & observation
- Absolute magnitude (H)
- 8.04
Discovery & classification
Sources
- orbital elements: JPL SBDB