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Trans-Neptunian object

2016 SU55

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(2016 SU55)

Where is it now

Distance from Sun
39.17 AU
True anomaly
161.14°
Distance from Earth
38.261 AU
As of
15 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 2016 SU55 — 39.17 AU from the Sun 2016 SU55
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2016 SU55 is 38.261 AU from Earth today (5.3 light-hours).

In the sky

Right ascension
03h 02m 12s
Declination
+08° 06′ 31″
Constellation
Cetus
Distance from Earth
38.26 AU
Elongation from the Sun
156.26° — well clear of the Sun

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
38.121 AU
Eccentricity
0.0292
Inclination
27.75°
Orbital period
235.4 years
Perihelion
37.009 AU
Aphelion
39.233 AU
Longitude of ascending node
61.45°
Argument of periapsis
180.3°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,009.0 LD
35.9969 AU
Tisserand (Jupiter)
4.925

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
43
Data arc
7.05 years
First observed
2 October 2013
Last observed
20 October 2020
Residual RMS
0.17 ″
Solution · Otto Matic
11 March 2026

Visual & observation

Absolute magnitude (H)
8.03

Discovery & classification

Also known as 2015 TY363

TNO

Sources