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Asteroid

Antonia

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272 Antonia (A888 CA)

Where is it now

Distance from Sun
2.699 AU
True anomaly
19.43°
Distance from Earth
2.988 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 Antonia — 2.699 AU from the Sun Antonia
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Antonia is 2.988 AU from Earth today (24.8 light-minutes).

In the sky

Right ascension
09h 54m 19s
Declination
+16° 59′ 54″
Constellation
Leo
Distance from Earth
2.98 AU
Elongation from the Sun
64.1° — well clear of the Sun

Favours the northern hemisphere; low or below the horizon from far south.

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
2.778 AU
Eccentricity
0.0302
Inclination
4.43°
Orbital period
4.63 years
Perihelion
2.694 AU
Aphelion
2.862 AU
Longitude of ascending node
37.28°
Argument of periapsis
68.64°
Epoch · J2000
2461200.5
Orbit class · MBA
Main-belt asteroid
Earth MOID · 667.3 LD
1.7147 AU
Tisserand (Jupiter)
3.329

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
13,633
Data arc
135.3 years
First observed
6 December 1890
Last observed
4 April 2026
Residual RMS
0.23 ″
Solution · Otto Matic
5 June 2026

Physical properties

Mean radius
13 km
Rotation period
3.85 hours

Visual & observation

Geometric albedo
0.128
Absolute magnitude (H)
10.85
Spectral type (SMASS)
X

Discovery & classification

Discovered by
Charlois, A.
Discovery date
4 February 1888
Discovery site
Nice

Also known as 272 · A888 CA · 1944 FE

Main-Belt Asteroid Named

Sources