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Trans-Neptunian object

559182

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559182 (2015 BZ518)

559182 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 38.18 AU to 55.37 AU from the Sun; one orbit takes 319.9 years. Discovered 24 January 2015 by Pan-STARRS 1. Orbit from the JPL solution of 1 August 2025.

Where is it now

Distance from Sun
47.328 AU
True anomaly
255.79°
Distance from Earth
48.205 AU
As of
24 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 559182 — 47.328 AU from the Sun 559182
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 559182 is 48.205 AU from Earth today (6.7 light-hours).

In the sky

Right ascension
15h 44m 26s
Declination
-22° 54′ 55″
Constellation
Libra
Distance from Earth
48.21 AU
Elongation from the Sun
27.13° — near the Sun — look low at dusk or dawn

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
46.772 AU
Eccentricity
0.1838
Inclination
11.4°
Orbital period
319.9 years
Perihelion
38.176 AU
Aphelion
55.369 AU
Longitude of ascending node
44°
Argument of periapsis
300.1°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,470.6 LD
37.183 AU
Tisserand (Jupiter)
5.889

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
257
Data arc
15.14 years
First observed
10 May 2010
Last observed
30 June 2025
Residual RMS
0.49 ″
Solution · Otto Matic
1 August 2025

Visual & observation

Absolute magnitude (H)
4.71

Discovery & classification

Discovered by
Pan-STARRS 1
Discovery date
24 January 2015
Discovery site
Haleakala

Also known as 2015 BZ518

TNO

Sources