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Comet

Jahn

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458P/Jahn

Where is it now

Distance from Sun
5.07 AU
True anomaly
184.8°
Distance from Earth
5.298 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 Jahn — 5.07 AU from the Sun Jahn
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Jahn is 5.298 AU from Earth today (44.1 light-minutes).

In the sky

Right ascension
18h 49m 52s
Declination
-35° 14′ 53″
Constellation
Sagittarius
Distance from Earth
5.31 AU
Elongation from the Sun
71.02° — well clear of the Sun

Favours the southern hemisphere; low or below the horizon from far north.

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
3.861 AU
Eccentricity
0.315
Inclination
13.61°
Orbital period
7.59 years
Perihelion
2.645 AU
Aphelion
5.078 AU
Longitude of ascending node
1.63°
Argument of periapsis
104.36°
Epoch · J2000
2458930.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 662.2 LD
1.7016 AU
Tisserand (Jupiter)
2.937

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
65
Data arc
9.34 years
First observed
22 November 2013
Last observed
25 March 2023
Residual RMS
0.4 ″
Solution · Otto Matic
26 April 2023

Visual & observation

Absolute magnitude (H)
9.2
Total magnitude M₁ · K₁ 22.5
9.2

Discovery & classification

Also known as 458P · 458P/2016 C3 · 458P/2023 C1

Named

Close approaches 10 on record

When (UTC) Body Distance Lunar distances Relative speed
2079-03-13 14:44:00 Juptr 1.4385 AU 559.8 LD 4.5 km/s
2082-05-22 07:08:00 Juptr 1.552 AU 604.0 LD 3.5 km/s
2158-10-07 17:02:00 Juptr 1.9367 AU 753.7 LD 5.4 km/s
2163-06-09 07:15:00 Juptr 1.9299 AU 751.1 LD 8.2 km/s
2183-05-25 14:51:00 Juptr 1.7387 AU 676.6 LD 4.3 km/s
2187-06-05 16:08:00 Juptr 1.0632 AU 413.8 LD 6.1 km/s

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

Sources