Comet
Perrine-Mrkos
18D/Perrine-Mrkos
Where is it now
- Distance from Sun
- 5.643 AU
- True anomaly
- 191.49°
- 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
- 3.56 AU
- Eccentricity
- 0.6426
- Inclination
- 17.76°
- Orbital period
- 6.72 years
- Perihelion
- 1.272 AU
- Aphelion
- 5.847 AU
- Longitude of ascending node
- 240.88°
- Argument of periapsis
- 166.05°
- Epoch · J2000
- JD 2440162.04213 (perihelion)
Visual & observation
- Absolute magnitude (H)
- 11.5
- Spectral type
- JFc
Sources
- orbital elements: JPL SBDB (comets)