Grigg-Mellish is a comet in the Comet orbit class. Its orbit takes it from 0.92 AU to 123.93 AU from the Sun; one orbit takes 493.3 years. Orbit from the JPL solution of 3 May 2021.
Where is it now
- Distance from Sun
- 102.219 AU
- True anomaly
- 175.42°
- Distance from Earth
- 101.398 AU
- As of
- 24 October 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
- 00h 27m 45s
- Declination
- +40° 17′ 17″
- Constellation
- Andromeda
- Distance from Earth
- 101.4 AU
- Elongation from the Sun
- 145.42° — well clear of the Sun
Favours the northern hemisphere; low or below the horizon from far south.
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
- 62.427 AU
- Eccentricity
- 0.9852
- Inclination
- 109.95°
- Orbital period
- 493.3 years
- Perihelion
- 0.924 AU
- Aphelion
- 123.931 AU
- Longitude of ascending node
- 190.47°
- Argument of periapsis
- 328.6°
- Epoch · J2000
- 2417683.5
- Orbit class · COM
- Comet
- Earth MOID · 1.2 LD
- 0.0031 AU
- Tisserand (Jupiter)
- -0.322
Orbit quality
Orbit very uncertain — the object may be effectively lost (uncertainty code 9).
- Observations used
- 4
- First observed
- 17 April 1907
- Last observed
- 17 April 1907
- Residual RMS
- 6.18 ″
- Solution · Otto Matic
- 3 May 2021
Discovery & classification
Also known as 1907 G1
Sources
- orbital elements: JPL SBDB