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Comet

Lemmon

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349P/Lemmon

Where is it now

Distance from Sun
4.385 AU
True anomaly
149.66°
Distance from Earth
3.421 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 — 4.385 AU from the Sun Lemmon
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Lemmon is 3.421 AU from Earth today (28.4 light-minutes).

In the sky

Right ascension
00h 42m 46s
Declination
+10° 04′ 15″
Constellation
Pisces
Distance from Earth
3.42 AU
Elongation from the Sun
163.34° — near opposition — up most of the night

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
3.571 AU
Eccentricity
0.2997
Inclination
5.49°
Orbital period
6.75 years
Perihelion
2.501 AU
Aphelion
4.641 AU
Longitude of ascending node
331.76°
Argument of periapsis
256.03°
Epoch · J2000
2458923.5
Orbit class · ETc
Encke-type comet
Earth MOID · 583.3 LD
1.4988 AU
Tisserand (Jupiter)
3.031

Orbit quality

Orbit very well determined (uncertainty code 1).

Observations used
228
Data arc
15.46 years
First observed
14 March 2010
Last observed
28 August 2025
Residual RMS
0.52 ″
Solution · Otto Matic
4 September 2026

Physical properties

Mean radius
1.49 km

Visual & observation

Geometric albedo
0.104
Absolute magnitude (H)
8.8
Total magnitude M₁ · K₁ 22.3
8.8

Discovery & classification

Also known as 349P · 349P/2010 EY90 · 349P/2017 B1

Named

Close approaches 10 on record

When (UTC) Body Distance Lunar distances Relative speed
2047-05-27 18:46:00 Juptr 0.7076 AU 275.4 LD 3.3 km/s
2104-10-02 07:41:00 Juptr 1.4602 AU 568.3 LD 2.3 km/s
2107-06-09 20:28:00 Juptr 1.2374 AU 481.6 LD 5.2 km/s
2189-12-03 05:50:00 Juptr 1.258 AU 489.6 LD 4.7 km/s
2192-02-03 21:19:00 Juptr 1.4087 AU 548.2 LD 1.6 km/s

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

Sources