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Trans-Neptunian object

2013 BK78

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(2013 BK78)

Where is it now

Distance from Sun
24.239 AU
True anomaly
119.97°
Distance from Earth
25.203 AU
As of
16 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.

Sun Earth — 0.997 AU from the Sun Earth 2013 BK78 — 24.239 AU from the Sun 2013 BK78
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2013 BK78 is 25.203 AU from Earth today (3.5 light-hours).

In the sky

Right ascension
14h 22m 55s
Declination
-12° 40′ 31″
Constellation
Libra
Distance from Earth
25.2 AU
Elongation from the Sun
14.26° — 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
38.373 AU
Eccentricity
0.7849
Inclination
2.21°
Orbital period
237.7 years
Perihelion
8.255 AU
Aphelion
68.49 AU
Longitude of ascending node
175.15°
Argument of periapsis
283.08°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 2,830.3 LD
7.2726 AU
Tisserand (Jupiter)
3.499

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
54
Data arc
4.1 years
First observed
10 January 2011
Last observed
17 February 2015
Residual RMS
0.2 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
12.5

Discovery & classification

TNO

Sources