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Comet

Lemmon

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C/2021 T1 (Lemmon)

Lemmon is a comet in the Comet orbit class. Its orbit takes it from 3.06 AU to 2,999.27 AU from the Sun; one orbit takes 58,163.5 years. Orbit from the JPL solution of 31 July 2022.

Where is it now

Distance from Sun
14.057 AU
True anomaly
124.51°
Distance from Earth
14.945 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 — 14.057 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 14.945 AU from Earth today (2.1 light-hours).

In the sky

Right ascension
15h 45m 49s
Declination
-17° 24′ 59″
Constellation
Libra
Distance from Earth
14.95 AU
Elongation from the Sun
25.51° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
1,501.164 AU
Eccentricity
0.998
Inclination
140.35°
Orbital period
58,163.5 years
Perihelion
3.058 AU
Aphelion
2,999.27 AU
Longitude of ascending node
56.82°
Argument of periapsis
51.5°
Epoch · J2000
2459555.5
Orbit class · COM
Comet
Earth MOID · 863.0 LD
2.2176 AU
Tisserand (Jupiter)
-1.665

Orbit quality

Observations used
114
Data arc
308 days
First observed
15 September 2021
Last observed
20 July 2022
Residual RMS
0.48 ″
Solution · Otto Matic
31 July 2022

Visual & observation

Absolute magnitude (H)
11.5
Total magnitude M₁ · K₁ 13.3
11.5

Discovery & classification

Also known as 2021 T1

Named

Sources