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Asteroid

Koronis

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158 Koronis (A876 AA)

Koronis is an asteroid in the Main-belt asteroid orbit class. Its orbit takes it from 2.71 AU to 3.02 AU from the Sun; one orbit takes 4.86 years; it is about 39 km across. Discovered 4 January 1876 by Knorre, V.. Orbit from the JPL solution of 5 June 2026.

Where is it now

Distance from Sun
2.771 AU
True anomaly
53.12°
Distance from Earth
2.88 AU
As of
25 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 — 0.994 AU from the Sun Earth Koronis — 2.771 AU from the Sun Koronis
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Koronis is 2.88 AU from Earth today (24.0 light-minutes).

In the sky

Right ascension
09h 24m 27s
Declination
+14° 51′ 38″
Constellation
Leo
Distance from Earth
2.87 AU
Elongation from the Sun
74.24° — well clear of the Sun

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
2.869 AU
Eccentricity
0.0537
Inclination
1.01°
Orbital period
4.86 years
Perihelion
2.715 AU
Aphelion
3.023 AU
Longitude of ascending node
277.65°
Argument of periapsis
147.69°
Epoch · J2000
2461200.5
Orbit class · MBA
Main-belt asteroid
Earth MOID · 672.2 LD
1.7271 AU
Tisserand (Jupiter)
3.296

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
10,436
Data arc
132.6 years
First observed
12 August 1893
Last observed
17 March 2026
Residual RMS
0.28 ″
Solution · Otto Matic
5 June 2026

Physical properties

Mean radius
20 km
Rotation period
14.22 hours

Visual & observation

Geometric albedo
0.213
Absolute magnitude (H)
9.32
Colour index (B–V)
0.86
Spectral type (SMASS)
S
Spectral type (Tholen)
S
Colour index (U–B)
0.39

Discovery & classification

Discovered by
Knorre, V.
Discovery date
4 January 1876
Discovery site
Berlin

Also known as 158 · A876 AA · 1955 HA1 · A893 PA · A911 HB

Main-Belt Asteroid Named

Sources