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Asteroid

Euphrosyne

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31 Euphrosyne (A854 RA)

Where is it now

Distance from Sun
3.795 AU
True anomaly
197.59°
Distance from Earth
4.059 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 Euphrosyne — 3.795 AU from the Sun Euphrosyne
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Euphrosyne is 4.059 AU from Earth today (33.8 light-minutes).

In the sky

Right ascension
18h 21m 00s
Declination
-47° 24′ 39″
Constellation
Telescopium
Distance from Earth
4.06 AU
Elongation from the Sun
67.6° — 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
3.162 AU
Eccentricity
0.2158
Inclination
26.31°
Orbital period
5.62 years
Perihelion
2.48 AU
Aphelion
3.844 AU
Longitude of ascending node
30.79°
Argument of periapsis
62.01°
Epoch · J2000
2461200.5
Orbit class · MBA
Main-belt asteroid
Earth MOID · 619.3 LD
1.5913 AU
Tisserand (Jupiter)
3.01

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
4,782
Data arc
165.5 years
First observed
25 October 1860
Last observed
12 April 2026
Residual RMS
0.41 ″
Solution · Otto Matic
5 June 2026

Physical properties

Mean radius
134 km
Rotation period
5.53 hours

Visual & observation

Geometric albedo
0.053
Absolute magnitude (H)
6.83
Colour index (B–V)
0.69
Spectral type (SMASS)
Cb
Spectral type (Tholen)
C
Colour index (U–B)
0.32

Discovery & classification

Discovered by
Ferguson, J.
Discovery date
1 September 1854
Discovery site
Washington

Also known as 31 · A854 RA · A907 GP · A918 GB

Main-Belt Asteroid Named

Sources