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Asteroid

Eunomia

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15 Eunomia (A851 OA)

Where is it now

Distance from Sun
3.134 AU
True anomaly
185.68°
Distance from Earth
4.077 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 Eunomia — 3.134 AU from the Sun Eunomia
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Eunomia is 4.077 AU from Earth today (33.9 light-minutes).

In the sky

Right ascension
13h 50m 11s
Declination
-20° 40′ 29″
Constellation
Virgo
Distance from Earth
4.08 AU
Elongation from the Sun
16.37° — too close to the Sun to observe

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
2.642 AU
Eccentricity
0.1878
Inclination
11.76°
Orbital period
4.29 years
Perihelion
2.146 AU
Aphelion
3.138 AU
Longitude of ascending node
292.88°
Argument of periapsis
98.46°
Epoch · J2000
2461200.5
Orbit class · MBA
Main-belt asteroid
Earth MOID · 462.4 LD
1.1883 AU
Tisserand (Jupiter)
3.34

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
5,326
Data arc
174.5 years
First observed
2 September 1851
Last observed
22 March 2026
Residual RMS
0.43 ″
Solution · Otto Matic
16 June 2026

Physical properties

Mean radius
116 km
Rotation period
6.08 hours

Visual & observation

Geometric albedo
0.248
Absolute magnitude (H)
5.42
Colour index (B–V)
0.84
Spectral type (SMASS)
S
Spectral type (Tholen)
S
Colour index (U–B)
0.45

Discovery & classification

Discovered by
de Gasparis, A.
Discovery date
29 July 1851
Discovery site
Naples

Also known as 15 · A851 OA

Main-Belt Asteroid Named

Sources