Comet
Hartley
100P/Hartley 1
Where is it now
- Distance from Sun
- 4.573 AU
- True anomaly
- 203.77°
- As of
- 29 August 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.
Orbital elements
- Semi-major axis
- 3.428 AU
- Eccentricity
- 0.4138
- Inclination
- 25.58°
- Orbital period
- 6.35 years
- Perihelion
- 2.01 AU
- Aphelion
- 4.847 AU
- Longitude of ascending node
- 37.76°
- Argument of periapsis
- 181.87°
- Epoch · J2000
- JD 2457480.59269 (perihelion)
Visual & observation
- Absolute magnitude (H)
- 9.9
- Spectral type
- JFc
Sources
- orbital elements: JPL SBDB (comets)