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Comet

Lemmon

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C/2007 S2 (Lemmon)

Where is it now

Distance from Sun
19.045 AU
True anomaly
168.38°
Distance from Earth
18.847 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 — 19.045 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 18.847 AU from Earth today (2.6 light-hours).

In the sky

Right ascension
20h 49m 16s
Declination
-12° 08′ 05″
Constellation
Aquarius
Distance from Earth
18.85 AU
Elongation from the Sun
99.72° — 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
12.547 AU
Eccentricity
0.557
Inclination
16.86°
Orbital period
44.44 years
Perihelion
5.558 AU
Aphelion
19.535 AU
Longitude of ascending node
296.25°
Argument of periapsis
210.47°
Epoch · J2000
2454649.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 1,783.0 LD
4.5816 AU
Tisserand (Jupiter)
2.883

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
423
Data arc
19.05 years
First observed
29 August 2003
Last observed
15 September 2022
Residual RMS
0.49 ″
Solution · Otto Matic
13 April 2024

Visual & observation

Absolute magnitude (H)
10.5
Total magnitude M₁ · K₁ 6
10.5

Discovery & classification

Also known as 2007 S2

Named

Sources