2025 MJ400 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 29.99 AU to 64.91 AU from the Sun; one orbit takes 326.9 years.
Where is it now
- Distance from Sun
- 33.021 AU
- True anomaly
- 311.2°
- Distance from Earth
- 32.857 AU
- As of
- 25 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
- 20h 59m 19s
- Declination
- -21° 52′ 48″
- Constellation
- Capricornus
- Distance from Earth
- 32.86 AU
- Elongation from the Sun
- 98.54° — well clear of the Sun
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
- 47.451 AU
- Eccentricity
- 0.368
- Inclination
- 7.79°
- Orbital period
- 326.9 years
- Perihelion
- 29.99 AU
- Aphelion
- 64.911 AU
- Longitude of ascending node
- 348.53°
- Argument of periapsis
- 12.74°
- Epoch · J2000
- 2461200.5
- Orbit class · TNO
- Trans-Neptunian object
- Tisserand (Jupiter)
- 5.674
Orbit quality
Orbit poorly determined (uncertainty code 7).
- Observations used
- 16
- Data arc
- 93 days
- First observed
- 20 June 2025
- Last observed
- 21 September 2025
- Residual RMS
- 0.22 ″
Visual & observation
- Absolute magnitude (H)
- 7.85
Discovery & classification
Sources
- orbital elements: JPL SBDB