109P/Swift-Tuttle
📋 A written introduction is coming — for now this page shows official values only.
Physical data
- Diameter
- 26 km
Orbit
- Orbit class (JPL)
- HTC — Halley-type Comet*
- Semi-major axis
- 26.1 AU
- Eccentricity
- 0.963
- Inclination
- 113°
- Perihelion distance
- 0.96 AU
- Aphelion distance
- 51.2 AU
- Orbital period
- 48,700 days
- Perihelion passage
- JD 2448968.500
- Earth MOID
- 0.000892 AU
Earth approach
- Potentially hazardous (PHA)
- No
- Near-Earth object (NEO)
- Yes
In everyday life
- About 26 km across — 6.5% of the 400 km Seoul–Busan expressway.
- One orbit takes about 48,700 Earth days (about 133.3 years).
- Sunlight needs about 3.6 hours to reach it on average (semi-major axis 26.1 AU) — versus about 8 min 19 s to Earth.