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Comet

Neujmin

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28P/Neujmin 1

Where is it now

Distance from Sun
11.031 AU
True anomaly
164.77°
Distance from Earth
11.407 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.

Sun Earth — 0.995 AU from the Sun Earth Neujmin — 11.031 AU from the Sun Neujmin
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Neujmin is 11.407 AU from Earth today (1.6 light-hours).

In the sky

Right ascension
09h 54m 32s
Declination
+19° 31′ 36″
Constellation
Leo
Distance from Earth
11.39 AU
Elongation from the Sun
66.37° — 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
6.965 AU
Eccentricity
0.7735
Inclination
14.31°
Orbital period
18.38 years
Perihelion
1.578 AU
Aphelion
12.353 AU
Longitude of ascending node
346.35°
Argument of periapsis
347.44°
Epoch · J2000
2458727.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 222.3 LD
0.5713 AU
Tisserand (Jupiter)
2.168

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
1,228
Data arc
112.5 years
First observed
8 September 1913
Last observed
25 February 2026
Residual RMS
0.32 ″
Solution · Davide Farnocchia
5 June 2026

Physical properties

Mean radius
11 km

Visual & observation

Geometric albedo
0.025
Absolute magnitude (H)
13.2
Total magnitude M₁ · K₁ 4.5
13.2

Discovery & classification

Discovered by
Neujmin, G. N.
Discovery date
4 September 1913
Discovery site
Simeis, Crimea

Also known as 28P · 1913 III · 1913c · 1931 I · 1931d · 1948 XIII · 1948f · 1966 VI

Named

Close approaches 4 on record

When (UTC) Body Distance Lunar distances Relative speed
2132-03-20 15:17:00 Juptr 1.8877 AU 734.7 LD 7.7 km/s

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

Sources