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Comet

Lemmon

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C/2022 Y2 (Lemmon)

Lemmon is a comet in the Halley-type comet orbit class. Its orbit takes it from 2.54 AU to 36.74 AU from the Sun; one orbit takes 87.05 years. Orbit from the JPL solution of 13 October 2023.

Where is it now

Distance from Sun
10.174 AU
True anomaly
127.69°
Distance from Earth
9.543 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 — 10.174 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 9.543 AU from Earth today (1.3 light-hours).

In the sky

Right ascension
23h 02m 56s
Declination
-19° 07′ 04″
Constellation
Aquarius
Distance from Earth
9.55 AU
Elongation from the Sun
126.67° — well clear of the Sun

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
19.642 AU
Eccentricity
0.8704
Inclination
165.91°
Orbital period
87.05 years
Perihelion
2.545 AU
Aphelion
36.739 AU
Longitude of ascending node
216.35°
Argument of periapsis
105.55°
Epoch · J2000
2459976.5
Orbit class · HTC
Halley-type comet
Earth MOID · 624.8 LD
1.6053 AU
Tisserand (Jupiter)
-1.59

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
164
Data arc
289 days
First observed
24 December 2022
Last observed
9 October 2023
Residual RMS
0.58 ″
Solution · Otto Matic
13 October 2023

Visual & observation

Absolute magnitude (H)
9.7
Total magnitude M₁ · K₁ 20.3
9.7

Discovery & classification

Also known as 2022 Y2

Named

Sources