2025 NG551 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 29.4 AU to 68.84 AU from the Sun; one orbit takes 344.3 years.
Where is it now
- Distance from Sun
- 43.053 AU
- True anomaly
- 263.87°
- Distance from Earth
- 42.82 AU
- As of
- 26 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
- 21h 19m 11s
- Declination
- -19° 23′ 44″
- Constellation
- Capricornus
- Distance from Earth
- 42.82 AU
- Elongation from the Sun
- 102.65° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
From your location
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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
- 49.123 AU
- Eccentricity
- 0.4014
- Inclination
- 3.57°
- Orbital period
- 344.3 years
- Perihelion
- 29.403 AU
- Aphelion
- 68.843 AU
- Longitude of ascending node
- 44.95°
- Argument of periapsis
- 8.67°
- Epoch · J2000
- 2461200.5
- Orbit class · TNO
- Trans-Neptunian object
- Tisserand (Jupiter)
- 5.723
Orbit quality
Orbit very uncertain — the object may be effectively lost (uncertainty code 9).
- Observations used
- 13
- Data arc
- 27 days
- First observed
- 2 July 2025
- Last observed
- 29 July 2025
- Residual RMS
- 0.29 ″
Visual & observation
- Absolute magnitude (H)
- 6.76
Discovery & classification
Sources
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB