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Trans-Neptunian object

2015 BY518

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(2015 BY518)

2015 BY518 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 37.34 AU to 58.22 AU from the Sun; one orbit takes 330.3 years. Orbit from the JPL solution of 11 March 2026.

Where is it now

Distance from Sun
37.494 AU
True anomaly
347.77°
Distance from Earth
38.074 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.

Sun Earth — 0.994 AU from the Sun Earth 2015 BY518 — 37.494 AU from the Sun 2015 BY518
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 BY518 is 38.074 AU from Earth today (5.3 light-hours).

In the sky

Right ascension
10h 23m 55s
Declination
-06° 41′ 58″
Constellation
Sextans
Distance from Earth
38.06 AU
Elongation from the Sun
54.37° — 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
47.782 AU
Eccentricity
0.2185
Inclination
26.16°
Orbital period
330.3 years
Perihelion
37.341 AU
Aphelion
58.224 AU
Longitude of ascending node
194.17°
Argument of periapsis
334.15°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,152.7 LD
36.3662 AU
Tisserand (Jupiter)
5.417

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
158
Data arc
18.05 years
First observed
6 December 2007
Last observed
25 December 2025
Residual RMS
0.5 ″
Solution · Otto Matic
11 March 2026

Visual & observation

Absolute magnitude (H)
6.44

Discovery & classification

TNO

Sources