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Comet

PANSTARRS

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C/2017 S2 (PANSTARRS)

PANSTARRS is a comet in the Jupiter-family comet (P < 20 y) orbit class. Its orbit takes it from 3.61 AU to 37.25 AU from the Sun; one orbit takes 92.37 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
18.214 AU
True anomaly
140.84°
Distance from Earth
18.688 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 PANSTARRS — 18.214 AU from the Sun PANSTARRS
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. PANSTARRS is 18.688 AU from Earth today (2.6 light-hours).

In the sky

Right ascension
10h 34m 40s
Declination
+22° 16′ 00″
Constellation
Leo
Distance from Earth
18.68 AU
Elongation from the Sun
60.62° — 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
20.434 AU
Eccentricity
0.8231
Inclination
12.68°
Orbital period
92.37 years
Perihelion
3.615 AU
Aphelion
37.253 AU
Longitude of ascending node
62.43°
Argument of periapsis
305.97°
Epoch · J2000
2458036.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 1,025.7 LD
2.6355 AU
Tisserand (Jupiter)
2.45

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
67
Data arc
175 days
First observed
22 August 2017
Last observed
13 February 2018
Residual RMS
0.32 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
7.7
Total magnitude M₁ · K₁ 19.8
7.7

Discovery & classification

Also known as 2017 S2

Named

Sources