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Comet

Lemmon

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C/2024 B2 (Lemmon)

Lemmon is a comet in the Comet orbit class. Its orbit takes it from 4.08 AU to 11,486.57 AU from the Sun; one orbit takes 435,491.5 years. Orbit from the JPL solution of 2 January 2025.

Where is it now

Distance from Sun
9.428 AU
True anomaly
97.79°
Distance from Earth
9.262 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 — 9.428 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 9.262 AU from Earth today (1.3 light-hours).

In the sky

Right ascension
07h 05m 25s
Declination
-26° 11′ 15″
Constellation
Canis Major
Distance from Earth
9.26 AU
Elongation from the Sun
97.02° — 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
5,745.321 AU
Eccentricity
0.9993
Inclination
99.84°
Orbital period
435,491.5 years
Perihelion
4.076 AU
Aphelion
11,486.566 AU
Longitude of ascending node
294.38°
Argument of periapsis
130.31°
Epoch · J2000
2460357.5
Orbit class · COM
Comet
Earth MOID · 1,313.5 LD
3.375 AU
Tisserand (Jupiter)
-0.427

Orbit quality

Observations used
92
Data arc
591 days
First observed
14 May 2023
Last observed
25 December 2024
Residual RMS
0.4 ″
Solution · Otto Matic
2 January 2025

Visual & observation

Absolute magnitude (H)
15.4
Total magnitude M₁ · K₁ 4.5
15.4

Discovery & classification

Also known as 2024 B2

Named

Sources