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Comet

Rinner

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373P/Rinner

Where is it now

Distance from Sun
2.329 AU
True anomaly
15.53°
Distance from Earth
2.35 AU
As of
22 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 — 0.995 AU from the Sun Earth Rinner — 2.329 AU from the Sun Rinner
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Rinner is 2.35 AU from Earth today (19.5 light-minutes).

In the sky

Right ascension
08h 49m 43s
Declination
+05° 53′ 00″
Constellation
Hydra
Distance from Earth
2.35 AU
Elongation from the Sun
76.81° — well clear of the Sun

Visible from both hemispheres.

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
3.802 AU
Eccentricity
0.3937
Inclination
13.77°
Orbital period
7.41 years
Perihelion
2.305 AU
Aphelion
5.299 AU
Longitude of ascending node
232.02°
Argument of periapsis
221.22°
Epoch · J2000
2456703.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 522.0 LD
1.3413 AU
Tisserand (Jupiter)
2.895

Orbit quality

Orbit very well determined (uncertainty code 1).

Observations used
900
Data arc
7.34 years
First observed
28 November 2011
Last observed
1 April 2019
Residual RMS
0.77 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
6
Total magnitude M₁ · K₁ 29
6

Discovery & classification

Also known as 373P · 373P/2011 W2 · 373P/2018 R2

Named

Close approaches 11 on record

When (UTC) Body Distance Lunar distances Relative speed
2066-10-03 22:09:00 Juptr 0.7097 AU 276.2 LD 4 km/s
2102-01-31 04:27:00 Jupiter 0.4957 AU 192.9 LD 4.9 km/s
2102-01-31 04:27:00 Juptr 0.4957 AU 192.9 LD 4.9 km/s
2105-07-13 05:30:00 Juptr 1.8812 AU 732.1 LD 3.6 km/s
2161-12-29 09:19:00 Juptr 0.769 AU 299.3 LD 3.7 km/s
2196-11-24 04:22:00 Juptr 1.0775 AU 419.3 LD 7 km/s

Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.

Sources