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Asteroid

Eurynome

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79 Eurynome (A863 RA)

Where is it now

Distance from Sun
2.855 AU
True anomaly
203.48°
Distance from Earth
3.646 AU
As of
21 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 Eurynome — 2.855 AU from the Sun Eurynome
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Eurynome is 3.646 AU from Earth today (30.3 light-minutes).

In the sky

Right ascension
15h 56m 04s
Declination
-17° 47′ 16″
Constellation
Libra
Distance from Earth
3.65 AU
Elongation from the Sun
32.2° — near the Sun — look low at dusk or dawn

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
2.444 AU
Eccentricity
0.1909
Inclination
4.61°
Orbital period
3.82 years
Perihelion
1.978 AU
Aphelion
2.911 AU
Longitude of ascending node
206.5°
Argument of periapsis
201.39°
Epoch · J2000
2461200.5
Orbit class · MBA
Main-belt asteroid
Earth MOID · 384.2 LD
0.9872 AU
Tisserand (Jupiter)
3.47

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
9,752
Data arc
162.5 years
First observed
5 October 1863
Last observed
13 April 2026
Residual RMS
0.29 ″
Solution · Otto Matic
5 June 2026

Physical properties

Mean radius
32 km
Rotation period
5.98 hours

Visual & observation

Geometric albedo
0.287
Absolute magnitude (H)
7.78
Colour index (B–V)
0.87
Spectral type (SMASS)
S
Spectral type (Tholen)
S
Colour index (U–B)
0.42

Discovery & classification

Discovered by
Watson, J. C.
Discovery date
14 September 1863
Discovery site
Ann Arbor

Also known as 79 · A863 RA

Main-Belt Asteroid Named

Sources