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Comet

Lemmon

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C/2019 T2 (Lemmon)

Lemmon is a comet in the Comet orbit class. Its orbit takes it from 2.65 AU to 4,137.54 AU from the Sun; one orbit takes 94,187.3 years. Orbit from the JPL solution of 6 August 2023.

Where is it now

Distance from Sun
15.309 AU
True anomaly
130.95°
Distance from Earth
15.815 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 — 15.309 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 15.815 AU from Earth today (2.2 light-hours).

In the sky

Right ascension
10h 41m 41s
Declination
+18° 18′ 47″
Constellation
Leo
Distance from Earth
15.81 AU
Elongation from the Sun
58.21° — near the Sun — look low at dusk or dawn

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
2,070.091 AU
Eccentricity
0.9987
Inclination
111.49°
Orbital period
94,187.3 years
Perihelion
2.646 AU
Aphelion
4,137.536 AU
Longitude of ascending node
155.64°
Argument of periapsis
239.39°
Epoch · J2000
2459271.5
Orbit class · COM
Comet
Earth MOID · 773.2 LD
1.9867 AU
Tisserand (Jupiter)
-0.736

Orbit quality

Observations used
187
Data arc
3.8 years
First observed
26 August 2019
Last observed
14 June 2023
Residual RMS
0.34 ″
Solution · Otto Matic
6 August 2023

Visual & observation

Absolute magnitude (H)
12.7
Total magnitude M₁ · K₁ 5.8
12.7

Discovery & classification

Also known as 2019 T2

Named

Sources