Where is it now
- Distance from Sun
- 2.673 AU
- True anomaly
- 290.71°
- Distance from Earth
- 2.594 AU
- As of
- 2 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
- 07h 10m 41s
- Declination
- +23° 14′ 23″
- Constellation
- Gemini
- Distance from Earth
- 2.58 AU
- Elongation from the Sun
- 84° — well clear of the Sun
Favours the northern hemisphere; low or below the horizon from far south.
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
- 2.766 AU
- Eccentricity
- 0.0797
- Inclination
- 10.59°
- Orbital period
- 4.6 years
- Perihelion
- 2.545 AU
- Aphelion
- 2.986 AU
- Longitude of ascending node
- 80.25°
- Argument of periapsis
- 73.29°
- Epoch · J2000
- 2461200.5
- Orbit class · MBA
- Main-belt asteroid
- Earth MOID · 615.3 LD
- 1.5811 AU
- Tisserand (Jupiter)
- 3.31
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 1,075
- Data arc
- 26.06 years
- First observed
- 5 January 1995
- Last observed
- 28 January 2021
- Residual RMS
- 0.43 ″
- Solution · Davide Farnocchia
- 13 April 2021
Physical properties
- Mean radius
- 470 km
- Mass
- 9.384 × 10²⁰ kg
- Density
- 2.162 g/cm³
- Rotation period
- 9.07 hours
- Axial tilt
- 4°
- Surface gravity
- 0.27 m/s²
- Escape velocity
- 0.51 km/s
- GM
- 62.628 km³/s²
- Shape · km
- 964.4 x 964.2 x 891.8
Visual & observation
- Geometric albedo
- 0.09
- Absolute magnitude (H)
- 3.34
- Colour index (B–V)
- 0.71
- Spectral type (SMASS)
- C
- Spectral type (Tholen)
- G
- Colour index (U–B)
- 0.43
- Representative colour
- #A6A6A0
Discovery & classification
- Discovered by
- Piazzi, G.
- Discovery date
- 1 January 1801
- Discovery site
- Palermo
Also known as 1 · A801 AA · 1 Ceres (A801 AA) · 1943 XB · A899 OF
Close approaches 2 on record
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2056-06-26 01:01:00 | 10 Hygiea | 0.0258 AU | 10.1 LD | 4.7 km/s |
| 2056-06-26 01:01:00 | Hygie | 0.0258 AU | 10.1 LD | 4.7 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- physical properties: JPL SBDB (lookup)
- physical 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
- physical properties: NASA Planetary Fact Sheet
- visual properties: NASA Planetary Fact Sheet