Where is it now
- Distance from Sun
- 3.023 AU
- True anomaly
- 181.85°
- Distance from Earth
- 3.875 AU
- As of
- 21 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
- 15h 30m 37s
- Declination
- -20° 45′ 04″
- Constellation
- Libra
- Distance from Earth
- 3.88 AU
- Elongation from the Sun
- 27.04° — 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
- 2.668 AU
- Eccentricity
- 0.1334
- Inclination
- 2.42°
- Orbital period
- 4.36 years
- Perihelion
- 2.312 AU
- Aphelion
- 3.024 AU
- Longitude of ascending node
- 1.05°
- Argument of periapsis
- 61.13°
- Epoch · J2000
- 2461200.5
- Orbit class · MBA
- Main-belt asteroid
- Earth MOID · 515.6 LD
- 1.325 AU
- Tisserand (Jupiter)
- 3.368
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 5,985
- Data arc
- 146.7 years
- First observed
- 18 July 1879
- Last observed
- 14 April 2026
- Residual RMS
- 0.39 ″
- Solution · Otto Matic
- 5 June 2026
Physical properties
- Mean radius
- 31 km
- Rotation period
- 9 hours
Visual & observation
- Geometric albedo
- 0.177
- Absolute magnitude (H)
- 8.58
- Colour index (B–V)
- 0.75
- Spectral type (SMASS)
- Xe
- Spectral type (Tholen)
- MU
- Colour index (U–B)
- 0.25
Discovery & classification
- Discovered by
- Peters, C. H. F.
- Discovery date
- 12 November 1862
- Discovery site
- Clinton
Also known as 77 · A862 VA · 1936 SP
Sources
- visual properties: JPL SBDB (lookup)
- physical properties: JPL SBDB (lookup)
- physical properties: JPL SBDB (lookup)
- physical properties: JPL SBDB (lookup)
- visual properties: JPL SBDB (lookup)
- visual properties: JPL SBDB (lookup)
- visual properties: JPL SBDB (lookup)
- visual properties: JPL SBDB (lookup)
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB