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Comet

Lemmon

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C/2019 J1 (Lemmon)

Lemmon is a comet in the Comet orbit class. Its orbit takes it from 2.48 AU to 140.61 AU from the Sun; one orbit takes 605.2 years. Orbit from the JPL solution of 14 January 2023.

Where is it now

Distance from Sun
18.755 AU
True anomaly
140.07°
Distance from Earth
17.863 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 Lemmon — 18.755 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 17.863 AU from Earth today (2.5 light-hours).

In the sky

Right ascension
03h 29m 56s
Declination
-01° 48′ 57″
Constellation
Eridanus
Distance from Earth
17.86 AU
Elongation from the Sun
153.5° — 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
71.546 AU
Eccentricity
0.9654
Inclination
24.55°
Orbital period
605.2 years
Perihelion
2.479 AU
Aphelion
140.614 AU
Longitude of ascending node
98.09°
Argument of periapsis
167.79°
Epoch · J2000
2458652.5
Orbit class · COM
Comet
Earth MOID · 571.2 LD
1.4678 AU
Tisserand (Jupiter)
1.833

Orbit quality

Orbit reasonably well determined (uncertainty code 3).

Observations used
192
Data arc
200 days
First observed
4 May 2019
Last observed
20 November 2019
Residual RMS
0.46 ″
Solution · Otto Matic
14 January 2023

Visual & observation

Absolute magnitude (H)
12
Total magnitude M₁ · K₁ 11.3
12

Discovery & classification

Also known as 2019 J1

Named

Sources