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Asteroid

Antiope

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90 Antiope (A866 TA)

Where is it now

Distance from Sun
3.264 AU
True anomaly
247.35°
Distance from Earth
4.261 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 Antiope — 3.264 AU from the Sun Antiope
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Antiope is 4.261 AU from Earth today (35.4 light-minutes).

In the sky

Right ascension
13h 19m 57s
Declination
-07° 04′ 25″
Constellation
Virgo
Distance from Earth
4.26 AU
Elongation from the Sun
2.39° — too close to the Sun to observe

Visible from both hemispheres.

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
3.141 AU
Eccentricity
0.1727
Inclination
2.21°
Orbital period
5.57 years
Perihelion
2.598 AU
Aphelion
3.683 AU
Longitude of ascending node
69.89°
Argument of periapsis
244.38°
Epoch · J2000
2461200.5
Orbit class · MBA
Main-belt asteroid
Earth MOID · 616.6 LD
1.5844 AU
Tisserand (Jupiter)
3.186

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
7,717
Data arc
159.5 years
First observed
1 October 1866
Last observed
13 April 2026
Residual RMS
0.35 ″
Solution · Otto Matic
5 June 2026

Physical properties

Mean radius
58 km
Rotation period
16.51 hours

Visual & observation

Geometric albedo
0.058
Absolute magnitude (H)
8.42
Colour index (B–V)
0.69
Spectral type (SMASS)
C
Spectral type (Tholen)
C
Colour index (U–B)
0.32

Discovery & classification

Discovered by
Luther, R.
Discovery date
1 October 1866
Discovery site
Dusseldorf

Also known as 90 · A866 TA · 1952 BK2

Main-Belt Asteroid Named

Close approaches 12 on record

When (UTC) Body Distance Lunar distances Relative speed
2087-04-13 06:41:00 Juptr 1.8888 AU 735.1 LD 2.2 km/s
2097-10-01 02:42:00 Juptr 1.6347 AU 636.2 LD 1.5 km/s
2108-03-12 05:22:00 Juptr 1.6975 AU 660.6 LD 2.1 km/s
2182-03-08 13:56:00 Juptr 1.8633 AU 725.1 LD 2.1 km/s
2192-08-27 13:51:00 Juptr 1.6365 AU 636.9 LD 1.5 km/s

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

Sources