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Comet

Lemmon

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507P/Lemmon

Where is it now

Distance from Sun
7.931 AU
True anomaly
144.57°
Distance from Earth
8.103 AU
As of
22 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.

Orbit of Mercury Orbit of Venus Orbit of Mars Sun Earth — 0.995 AU from the Sun Earth Lemmon — 7.931 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 8.103 AU from Earth today (1.1 light-hours).

In the sky

Right ascension
08h 45m 14s
Declination
+01° 24′ 23″
Constellation
Hydra
Distance from Earth
8.09 AU
Elongation from the Sun
77.45° — 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
6.289 AU
Eccentricity
0.568
Inclination
17.1°
Orbital period
15.77 years
Perihelion
2.717 AU
Aphelion
9.862 AU
Longitude of ascending node
233.43°
Argument of periapsis
108.75°
Epoch · J2000
2458593.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 689.6 LD
1.772 AU
Tisserand (Jupiter)
2.557

Orbit quality

Orbit very well determined (uncertainty code 1).

Observations used
99
Data arc
16.27 years
First observed
25 September 2007
Last observed
31 December 2023
Residual RMS
0.44 ″
Solution · Otto Matic
1 August 2025

Visual & observation

Absolute magnitude (H)
15.8
Total magnitude M₁ · K₁ 4.5
15.8

Discovery & classification

Also known as 507P · 507P/2007 SA24

Named

Close approaches 5 on record

When (UTC) Body Distance Lunar distances Relative speed
2113-06-02 19:25:00 Juptr 0.6109 AU 237.8 LD 7.2 km/s
2165-09-06 12:25:00 Juptr 1.8699 AU 727.7 LD 6.9 km/s
2195-07-26 17:11:00 Juptr 1.8396 AU 715.9 LD 12.4 km/s

Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.

Sources