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Comet

Lemmon

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C/2007 K1 (Lemmon)

Lemmon is a comet in the Comet orbit class. Its orbit takes it from 9.24 AU to 859.31 AU from the Sun; one orbit takes 9,050.1 years. Orbit from the JPL solution of 20 June 2022.

Where is it now

Distance from Sun
33.401 AU
True anomaly
117.55°
Distance from Earth
33.342 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 — 33.401 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 33.342 AU from Earth today (4.6 light-hours).

In the sky

Right ascension
08h 17m 15s
Declination
+29° 55′ 14″
Constellation
Cancer
Distance from Earth
33.34 AU
Elongation from the Sun
92.63° — well clear of the Sun

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
434.275 AU
Eccentricity
0.9787
Inclination
108.43°
Orbital period
9,050.1 years
Perihelion
9.239 AU
Aphelion
859.311 AU
Longitude of ascending node
294.66°
Argument of periapsis
51.97°
Epoch · J2000
2454277.5
Orbit class · COM
Comet
Earth MOID · 3,325.5 LD
8.545 AU
Tisserand (Jupiter)
-1.173

Orbit quality

Observations used
141
Data arc
4.85 years
First observed
14 June 2004
Last observed
20 April 2009
Residual RMS
0.53 ″
Solution · Otto Matic
20 June 2022

Visual & observation

Absolute magnitude (H)
11
Total magnitude M₁ · K₁ 4.5
11

Discovery & classification

Also known as 2007 K1

Named

Sources