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Comet

Mueller

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149P/Mueller 4

Where is it now

Distance from Sun
3.878 AU
True anomaly
262.2°
Distance from Earth
3.621 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 Mueller — 3.878 AU from the Sun Mueller
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Mueller is 3.621 AU from Earth today (30.1 light-minutes).

In the sky

Right ascension
07h 15m 57s
Declination
-03° 31′ 36″
Constellation
Monoceros
Distance from Earth
3.61 AU
Elongation from the Sun
97.98° — 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
4.326 AU
Eccentricity
0.3883
Inclination
29.75°
Orbital period
9 years
Perihelion
2.646 AU
Aphelion
6.007 AU
Longitude of ascending node
145.26°
Argument of periapsis
43.57°
Epoch · J2000
2456417.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 670.2 LD
1.7221 AU
Tisserand (Jupiter)
2.662

Orbit quality

Orbit very well determined (uncertainty code 1).

Observations used
494
Data arc
27.31 years
First observed
9 April 1992
Last observed
31 July 2019
Residual RMS
0.63 ″
Solution · Otto Matic
3 May 2023

Physical properties

Rotation period
11.88 hours

Visual & observation

Absolute magnitude (H)
15.5
Total magnitude M₁ · K₁ 4.5
15.5

Discovery & classification

Also known as 149P · 149P/1992 G3 · 1992 IV · 1992g

Named

Close approaches 8 on record

When (UTC) Body Distance Lunar distances Relative speed
2080-11-10 01:35:00 Juptr 0.5449 AU 212.1 LD 7.7 km/s
2104-07-13 11:31:00 Jupiter 0.1895 AU 73.8 LD 8.6 km/s
2104-07-13 11:31:00 Juptr 0.1895 AU 73.8 LD 8.6 km/s

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

Sources