Mellish
C/1917 F1 (Mellish)
Where is it now
- Distance from Sun
- 44.067 AU
- True anomaly
- 183.28°
- 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
- 03h 00m 16s
- Declination
- -10° 59′ 06″
- Constellation
- Eridanus
- Distance from Earth
- 43.41 AU
- Elongation from the Sun
- 130.39° — 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
- 27.286 AU
- Eccentricity
- 0.993
- Inclination
- 32.69°
- Orbital period
- 142.5 years
- Perihelion
- 0.19 AU
- Aphelion
- 54.381 AU
- Longitude of ascending node
- 88.68°
- Argument of periapsis
- 121.31°
- Epoch · J2000
- 2421335.5
- Orbit class · HTC
- Halley-type comet
- Earth MOID · 24.1 LD
- 0.0619 AU
- Tisserand (Jupiter)
- 0.645
Orbit quality
Orbit reasonably well determined (uncertainty code 5).
- Observations used
- 12
- Data arc
- 38 days
- First observed
- 24 March 1917
- Last observed
- 1 May 1917
- Residual RMS
- 0.68 ″
- Solution · Otto Matic
- 9 September 2025
Visual & observation
- Absolute magnitude (H)
- 10.9
- Total magnitude M₁ · K₁ 15.8
- 10.9
Discovery & classification
Also known as 1917 F1
Sources
- orbital elements: JPL SBDB