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Comet

Lemmon

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C/2019 U6 (Lemmon)

Lemmon is a comet in the Comet orbit class. Its orbit takes it from 0.91 AU to 871.14 AU from the Sun; one orbit takes 9,104.9 years. Orbit from the JPL solution of 16 April 2022.

Where is it now

Distance from Sun
18.32 AU
True anomaly
154.45°
Distance from Earth
17.665 AU
As of
25 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 Lemmon — 18.32 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 17.665 AU from Earth today (2.4 light-hours).

In the sky

Right ascension
23h 23m 17s
Declination
+50° 47′ 24″
Constellation
Andromeda
Distance from Earth
17.67 AU
Elongation from the Sun
129.97° — 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
436.026 AU
Eccentricity
0.9979
Inclination
61°
Orbital period
9,104.9 years
Perihelion
0.914 AU
Aphelion
871.138 AU
Longitude of ascending node
235.71°
Argument of periapsis
329.66°
Epoch · J2000
2458967.5
Orbit class · COM
Comet
Earth MOID · 11.1 LD
0.0285 AU
Tisserand (Jupiter)
0.586

Orbit quality

Observations used
1,144
Data arc
753 days
First observed
6 November 2018
Last observed
28 November 2020
Residual RMS
0.71 ″
Solution · Otto Matic
16 April 2022

Visual & observation

Absolute magnitude (H)
13.2
Total magnitude M₁ · K₁ 7.8
13.2

Discovery & classification

Also known as 2019 U6

Named

Sources