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Comet

PANSTARRS

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P/2021 R1 (PANSTARRS)

Where is it now

Distance from Sun
8.745 AU
True anomaly
119.66°
Distance from Earth
8.838 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.

Orbit of Mercury Orbit of Venus Orbit of Mars Sun Earth — 0.994 AU from the Sun Earth PANSTARRS — 8.745 AU from the Sun PANSTARRS
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. PANSTARRS is 8.838 AU from Earth today (1.2 light-hours).

In the sky

Right ascension
08h 47m 34s
Declination
+15° 57′ 08″
Constellation
Cancer
Distance from Earth
8.84 AU
Elongation from the Sun
81.58° — 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
8.407 AU
Eccentricity
0.4189
Inclination
5.52°
Orbital period
24.38 years
Perihelion
4.886 AU
Aphelion
11.928 AU
Longitude of ascending node
143.41°
Argument of periapsis
220.34°
Epoch · J2000
2459635.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 1,511.9 LD
3.8849 AU
Tisserand (Jupiter)
2.917

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
127
Data arc
835 days
First observed
10 August 2020
Last observed
23 November 2022
Residual RMS
0.25 ″
Solution · Otto Matic
8 December 2022

Visual & observation

Absolute magnitude (H)
7.5
Total magnitude M₁ · K₁ 15.3
7.5

Discovery & classification

Also known as 2021 R1

Named

Sources