Comet
Giacobini-Zinner
21P/Giacobini-Zinner
Where is it now
- Distance from Sun
- 4.546 AU
- True anomaly
- 150.55°
- 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
- 3.5 AU
- Eccentricity
- 0.7105
- Inclination
- 32°
- Orbital period
- 6.55 years
- Perihelion
- 1.013 AU
- Aphelion
- 5.987 AU
- Longitude of ascending node
- 195.4°
- Argument of periapsis
- 172.81°
- Epoch · J2000
- JD 2458371.76590 (perihelion)
Visual & observation
- Absolute magnitude (H)
- 13.2
- Spectral type
- JFc
Sources
- orbital elements: JPL SBDB (comets)