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Comet

McNaught-Russell

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C/1991 Q1 (McNaught-Russell)

McNaught-Russell is a comet in the Comet orbit class. Its orbit takes it from 3.19 AU to 1,155.86 AU from the Sun; one orbit takes 13,951.5 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
55.91 AU
True anomaly
153°
Distance from Earth
55.892 AU
As of
25 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.

Sun Earth — 0.994 AU from the Sun Earth McNaught-Russell — 55.91 AU from the Sun McNaught-Russell
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. McNaught-Russell is 55.892 AU from Earth today (7.7 light-hours).

In the sky

Right ascension
09h 58m 57s
Declination
+67° 16′ 50″
Constellation
Ursa Major
Distance from Earth
55.89 AU
Elongation from the Sun
90.72° — well clear of the Sun

Favours the northern hemisphere; low or below the horizon from far south.

From your location

See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

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
579.528 AU
Eccentricity
0.9945
Inclination
90.51°
Orbital period
13,951.5 years
Perihelion
3.194 AU
Aphelion
1,155.861 AU
Longitude of ascending node
120.46°
Argument of periapsis
257.23°
Epoch · J2000
2448846.5
Orbit class · COM
Comet
Earth MOID · 1,102.4 LD
2.8326 AU
Tisserand (Jupiter)
-0.011

Orbit quality

Observations used
29
Data arc
647 days
First observed
3 August 1991
Last observed
11 May 1993
Residual RMS
0.47 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
5
Total magnitude M₁ · K₁ 15.5
5

Discovery & classification

Also known as 1991 Q1

Named

Sources