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Solar
Asteroid

Parthenope

11 Parthenope (A850 JA)

Where is it now

Distance from Sun
2.541 AU
True anomaly
243.75°
Distance from Earth
3.511 AU
As of
2 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 — 1.001 AU from the Sun Earth Parthenope — 2.541 AU from the Sun Parthenope
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Parthenope is 3.511 AU from Earth today (29.2 light-minutes).

In the sky

Right ascension
13h 24m 12s
Declination
-05° 17′ 35″
Constellation
Virgo
Distance from Earth
3.51 AU
Elongation from the Sun
11.63° — too close to the Sun to observe

Visible from both hemispheres.

From your location

See how high it is right now, whether it's up after dark, 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
2.452 AU
Eccentricity
0.1009
Inclination
4.64°
Orbital period
3.84 years
Perihelion
2.205 AU
Aphelion
2.7 AU
Longitude of ascending node
125.47°
Argument of periapsis
196.46°
Epoch · J2000
2461200.5
Orbit class · MBA
Main-belt asteroid
Earth MOID · 463.7 LD
1.1916 AU
Tisserand (Jupiter)
3.483

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
10,636
Data arc
175.6 years
First observed
17 September 1850
Last observed
11 April 2026
Residual RMS
0.37 ″
Solution · Otto Matic
5 June 2026

Physical properties

Mean radius
71 km
Rotation period
13.72 hours

Visual & observation

Geometric albedo
0.191
Absolute magnitude (H)
6.73
Colour index (B–V)
0.84
Spectral type (SMASS)
Sk
Spectral type (Tholen)
S
Colour index (U–B)
0.42

Discovery & classification

Discovered by
de Gasparis, A.
Discovery date
11 May 1850
Discovery site
Naples

Also known as 11 · A850 JA

Main-Belt Asteroid Named

Sources