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Comet

Pruyne

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C/2020 H2 (Pruyne)

Pruyne is a comet in the Comet orbit class. Its orbit takes it from 0.83 AU to 372.87 AU from the Sun; one orbit takes 2,554.2 years. Orbit from the JPL solution of 10 January 2025.

Where is it now

Distance from Sun
18.555 AU
True anomaly
156.12°
Distance from Earth
18.152 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 Pruyne — 18.555 AU from the Sun Pruyne
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Pruyne is 18.152 AU from Earth today (2.5 light-hours).

In the sky

Right ascension
06h 37m 48s
Declination
+20° 47′ 20″
Constellation
Gemini
Distance from Earth
18.14 AU
Elongation from the Sun
113.39° — 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
186.854 AU
Eccentricity
0.9955
Inclination
125.04°
Orbital period
2,554.2 years
Perihelion
0.834 AU
Aphelion
372.874 AU
Longitude of ascending node
277.64°
Argument of periapsis
26.69°
Epoch · J2000
2458994.5
Orbit class · COM
Comet
Earth MOID · 51.1 LD
0.1312 AU
Tisserand (Jupiter)
-0.621

Orbit quality

Observations used
121
Data arc
51 days
First observed
26 April 2020
Last observed
16 June 2020
Residual RMS
0.72 ″
Solution · Otto Matic
10 January 2025

Visual & observation

Absolute magnitude (H)
18.9
Total magnitude M₁ · K₁ 22.3
18.9

Discovery & classification

Also known as 2020 H2

Named

Sources