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Centaur

2013 BU1

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(2013 BU1)

Where is it now

Distance from Sun
2.7 AU
True anomaly
63.08°
Distance from Earth
3.663 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 2013 BU1 — 2.7 AU from the Sun 2013 BU1
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2013 BU1 is 3.663 AU from Earth today (30.5 light-minutes).

In the sky

Right ascension
14h 00m 19s
Declination
-09° 39′ 28″
Constellation
Virgo
Distance from Earth
3.67 AU
Elongation from the Sun
12.56° — 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
5.586 AU
Eccentricity
0.6177
Inclination
5.98°
Orbital period
13.2 years
Perihelion
2.135 AU
Aphelion
9.036 AU
Longitude of ascending node
69.51°
Argument of periapsis
83.01°
Epoch · J2000
2461200.5
Orbit class · CEN
Centaur
Earth MOID · 450.0 LD
1.1563 AU
Tisserand (Jupiter)
2.552

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
117
Data arc
13.22 years
First observed
23 December 2012
Last observed
13 March 2026
Residual RMS
0.66 ″
Solution · Otto Matic
5 June 2026

Visual & observation

Absolute magnitude (H)
17

Discovery & classification

Centaur

Close approaches 11 on record

When (UTC) Body Distance Lunar distances Relative speed
2067-05-26 18:33:00 Juptr 0.3029 AU 117.9 LD 9.1 km/s
2067-05-26 18:33:00 Jupiter 0.3029 AU 117.9 LD 9.1 km/s
2079-06-08 16:09:00 Juptr 0.6439 AU 250.6 LD 10.9 km/s
2177-09-09 14:18:00 Jupiter 0.1201 AU 46.7 LD 10.2 km/s
2177-09-09 14:18:00 Juptr 0.1201 AU 46.7 LD 10.2 km/s

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

Sources