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Centaur

2021 UB133

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(2021 UB133)

Where is it now

Distance from Sun
6.961 AU
True anomaly
134.6°
Distance from Earth
7.928 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 2021 UB133 — 6.961 AU from the Sun 2021 UB133
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 UB133 is 7.928 AU from Earth today (1.1 light-hours).

In the sky

Right ascension
13h 51m 12s
Declination
-15° 33′ 20″
Constellation
Virgo
Distance from Earth
7.93 AU
Elongation from the Sun
12.96° — too close to the Sun to observe

Favours the southern hemisphere; low or below the horizon from far north.

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
5.972 AU
Eccentricity
0.3664
Inclination
13.63°
Orbital period
14.59 years
Perihelion
3.784 AU
Aphelion
8.16 AU
Longitude of ascending node
14.6°
Argument of periapsis
64.37°
Epoch · J2000
2459519.5
Orbit class · CEN
Centaur
Earth MOID · 1,100.6 LD
2.828 AU
Tisserand (Jupiter)
2.809

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 9).

Observations used
14
Data arc
10 days
First observed
28 October 2021
Last observed
7 November 2021
Residual RMS
0.67 ″
Solution · Otto Matic
11 February 2025

Visual & observation

Absolute magnitude (H)
16.16

Discovery & classification

Centaur

Sources