Crommelin
27P/Crommelin
Where is it now
- Distance from Sun
- 17.333 AU
- True anomaly
- 181.99°
- As of
- 17 September 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
- 17h 32m 59s
- Declination
- -14° 38′ 07″
- Constellation
- Serpens
- Distance from Earth
- 17.34 AU
- Elongation from the Sun
- 87.84° — well clear of the Sun
Visible from both hemispheres.
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
- 9.093 AU
- Eccentricity
- 0.9193
- Inclination
- 29.22°
- Orbital period
- 27.42 years
- Perihelion
- 0.734 AU
- Aphelion
- 17.453 AU
- Longitude of ascending node
- 250.96°
- Argument of periapsis
- 195.96°
- Epoch · J2000
- 2452489.5
- Orbit class · HTC
- Halley-type comet
- Earth MOID · 89.0 LD
- 0.2287 AU
- Tisserand (Jupiter)
- 1.481
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 455
- Data arc
- 55.31 years
- First observed
- 3 October 1956
- Last observed
- 26 January 2012
- Residual RMS
- 0.83 ″
- Solution · Davide Farnocchia
- 12 May 2023
Visual & observation
- Absolute magnitude (H)
- 12.7
- Total magnitude M₁ · K₁ 27.8
- 12.7
Discovery & classification
Also known as 27P
Close approaches 2 on record
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2120-12-22 22:15:00 | Earth | 0.2972 AU | 115.7 LD | 26.1 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- orbital elements: JPL SBDB