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Asteroid

Cyrene

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133 Cyrene (A873 QA)

Where is it now

Distance from Sun
3.058 AU
True anomaly
264.61°
Distance from Earth
3.742 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 Cyrene — 3.058 AU from the Sun Cyrene
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Cyrene is 3.742 AU from Earth today (31.1 light-minutes).

In the sky

Right ascension
11h 12m 13s
Declination
+03° 16′ 02″
Constellation
Leo
Distance from Earth
3.74 AU
Elongation from the Sun
41.13° — near the Sun — look low at dusk or dawn

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
3.073 AU
Eccentricity
0.1295
Inclination
7.24°
Orbital period
5.39 years
Perihelion
2.675 AU
Aphelion
3.471 AU
Longitude of ascending node
318.63°
Argument of periapsis
292.17°
Epoch · J2000
2461200.5
Orbit class · MBA
Main-belt asteroid
Earth MOID · 650.5 LD
1.6714 AU
Tisserand (Jupiter)
3.205

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
6,790
Data arc
152.6 years
First observed
17 August 1873
Last observed
7 April 2026
Residual RMS
0.31 ″
Solution · Otto Matic
5 June 2026

Physical properties

Mean radius
36 km
Rotation period
12.71 hours

Visual & observation

Geometric albedo
0.279
Absolute magnitude (H)
8.04
Colour index (B–V)
0.91
Spectral type (SMASS)
S
Spectral type (Tholen)
SR
Colour index (U–B)
0.51

Discovery & classification

Discovered by
Watson, J. C.
Discovery date
16 August 1873
Discovery site
Ann Arbor

Also known as 133 · A873 QA · 1936 HO · 1948 QC · 1959 UR · A910 NB

Main-Belt Asteroid Named

Close approaches 9 on record

When (UTC) Body Distance Lunar distances Relative speed
2035-04-23 04:43:00 Juptr 1.7299 AU 673.2 LD 2 km/s
2084-07-14 07:51:00 Juptr 1.7063 AU 664.0 LD 2.2 km/s
2093-12-03 07:21:00 Juptr 1.8674 AU 726.7 LD 3.1 km/s
2143-02-26 17:56:00 Juptr 1.6577 AU 645.1 LD 1.6 km/s
2192-04-14 04:39:00 Juptr 1.8995 AU 739.3 LD 3.2 km/s

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

Sources