Centaur
2015 HY543
(2015 HY543)
Where is it now
- Distance from Sun
- 6.354 AU
- True anomaly
- 257.61°
- As of
- 17 September 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
- 03h 14m 28s
- Declination
- +30° 25′ 54″
- Constellation
- Aries
- Distance from Earth
- 5.78 AU
- Elongation from the Sun
- 120.47° — well clear of the Sun
Favours the northern hemisphere; low or below the horizon from far south.
From your location
See how high it is right now, whether it's up after dark, and when it rises and sets where you are.
Your location stays in your browser and is sent only for this calculation. 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
- 6.432 AU
- Eccentricity
- 0.2587
- Inclination
- 20.25°
- Orbital period
- 16.31 years
- Perihelion
- 4.768 AU
- Aphelion
- 8.096 AU
- Longitude of ascending node
- 15.03°
- Argument of periapsis
- 135.41°
- Epoch · J2000
- 2461200.5
- Orbit class · CEN
- Centaur
- Tisserand (Jupiter)
- 2.824
Orbit quality
Orbit very uncertain — the object may be effectively lost (uncertainty code 8).
- Observations used
- 14
- Data arc
- 4 days
- First observed
- 18 April 2015
- Last observed
- 22 April 2015
- Residual RMS
- 0.72 ″
Visual & observation
- Absolute magnitude (H)
- 16.75
Discovery & classification
Centaur
Sources
- orbital elements: JPL SBDB