Where is it now
- Distance from Sun
- 40.862 AU
- True anomaly
- 319.98°
- Distance from Earth
- 41.349 AU
- As of
- 20 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
- 17h 48m 43s
- Declination
- -24° 13′ 22″
- Constellation
- Sagittarius
- Distance from Earth
- 41.36 AU
- Elongation from the Sun
- 59.63° — 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
- 43.799 AU
- Eccentricity
- 0.084
- Inclination
- 1.51°
- Orbital period
- 289.9 years
- Perihelion
- 40.12 AU
- Aphelion
- 47.478 AU
- Longitude of ascending node
- 55.94°
- Argument of periapsis
- 252.71°
- Epoch · J2000
- 2461200.5
- Orbit class · TNO
- Trans-Neptunian object
- Earth MOID · 15,218.6 LD
- 39.1051 AU
- Tisserand (Jupiter)
- 5.899
Orbit quality
Orbit reasonably well determined (uncertainty code 3).
- Observations used
- 54
- Data arc
- 20.21 years
- First observed
- 28 April 1998
- Last observed
- 12 July 2018
- Residual RMS
- 0.38 ″
- Solution · Otto Matic
- 13 April 2021
Visual & observation
- Absolute magnitude (H)
- 7.25
Discovery & classification
- Discovered by
- Mauna Kea
- Discovery date
- 28 April 1998
- Discovery site
- Mauna Kea
Also known as 1998 HP151
Sources
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB