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Trans-Neptunian object

2017 SZ118

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(2017 SZ118)

Where is it now

Distance from Sun
20.341 AU
True anomaly
152.95°
Distance from Earth
21.162 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 2017 SZ118 — 20.341 AU from the Sun 2017 SZ118
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 SZ118 is 21.162 AU from Earth today (2.9 light-hours).

In the sky

Right ascension
15h 34m 22s
Declination
-20° 16′ 03″
Constellation
Libra
Distance from Earth
21.17 AU
Elongation from the Sun
33.37° — 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
34.08 AU
Eccentricity
0.9541
Inclination
2.46°
Orbital period
199 years
Perihelion
1.564 AU
Aphelion
66.596 AU
Longitude of ascending node
32.55°
Argument of periapsis
52.22°
Epoch · J2000
2459400.5
Orbit class · TNO
Trans-Neptunian object
Tisserand (Jupiter)
1.684

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 9).

Observations used
10
Data arc
24 hours
First observed
25 September 2017
Last observed
26 September 2017
Residual RMS
0.15 ″

Visual & observation

Absolute magnitude (H)
18.69

Discovery & classification

TNO

Sources