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Comet

McNaught

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C/2012 Y3 (McNaught)

McNaught is a comet in the Halley-type comet orbit class. Its orbit takes it from 1.76 AU to 57.01 AU from the Sun; one orbit takes 159.3 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
27.317 AU
True anomaly
158.52°
Distance from Earth
27.516 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.

Sun Earth — 0.994 AU from the Sun Earth McNaught — 27.317 AU from the Sun McNaught
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. McNaught is 27.516 AU from Earth today (3.8 light-hours).

In the sky

Right ascension
10h 08m 07s
Declination
+46° 19′ 05″
Constellation
Ursa Major
Distance from Earth
27.51 AU
Elongation from the Sun
77.85° — 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
29.386 AU
Eccentricity
0.9399
Inclination
73.23°
Orbital period
159.3 years
Perihelion
1.765 AU
Aphelion
57.007 AU
Longitude of ascending node
122.71°
Argument of periapsis
235.69°
Epoch · J2000
2456324.5
Orbit class · HTC
Halley-type comet
Earth MOID · 403.9 LD
1.0379 AU
Tisserand (Jupiter)
0.645

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
150
Data arc
113 days
First observed
30 December 2012
Last observed
22 April 2013
Residual RMS
0.41 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
12.9
Total magnitude M₁ · K₁ 4.5
12.9

Discovery & classification

Also known as 2012 Y3

Named

Sources