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Comet

Neujmin

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25D/Neujmin 2

Where is it now

Distance from Sun
4.594 AU
True anomaly
163.54°
Distance from Earth
4.063 AU
As of
11 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 — 0.998 AU from the Sun Earth Neujmin — 4.594 AU from the Sun Neujmin
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Neujmin is 4.063 AU from Earth today (33.8 light-minutes).

In the sky

Right ascension
21h 09m 37s
Declination
-16° 56′ 34″
Constellation
Capricornus
Distance from Earth
4.07 AU
Elongation from the Sun
115.68° — 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
3.089 AU
Eccentricity
0.5668
Inclination
10.64°
Orbital period
5.43 years
Perihelion
1.338 AU
Aphelion
4.84 AU
Longitude of ascending node
328.72°
Argument of periapsis
193.7°
Epoch · J2000
2424960.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 136.4 LD
0.3504 AU
Tisserand (Jupiter)
2.932

Orbit quality

Orbit very well determined (uncertainty code 1).

Observations used
55
Data arc
10.93 years
First observed
5 March 1916
Last observed
10 February 1927
Residual RMS
1.27 ″
Solution · M.S.W. Keesey
18 April 2003

Visual & observation

Absolute magnitude (H)
12.5
Total magnitude M₁ · K₁ 15
12.5

Discovery & classification

Discovered by
Neujmin, G. N.
Discovery date
24 February 1916
Discovery site
Simeis, Crimea

Also known as 25D · 1916 II · 1916a · 1926g · 1927 I · 25D/1916 D1 · 25D/1926 V2

Named

Close approaches 16 on record

When (UTC) Body Distance Lunar distances Relative speed
2033-12-28 22:24:00 Juptr 0.297 AU 115.6 LD 5.2 km/s
2033-12-28 22:24:00 Jupiter 0.297 AU 115.6 LD 5.2 km/s
2046-01-04 12:53:00 Juptr 0.235 AU 91.5 LD 5.4 km/s
2046-01-04 12:53:00 Jupiter 0.235 AU 91.5 LD 5.4 km/s
2057-04-02 08:52:00 Juptr 1.0297 AU 400.7 LD 6.8 km/s
2117-05-21 12:02:00 Juptr 1.3041 AU 507.5 LD 8.5 km/s
2128-12-27 11:30:00 Juptr 0.1588 AU 61.8 LD 5.7 km/s
2128-12-27 11:30:00 Jupiter 0.1588 AU 61.8 LD 5.7 km/s
2187-10-08 01:09:00 Juptr 1.6044 AU 624.4 LD 7.1 km/s

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

Sources