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Trans-Neptunian object

2015 KL173

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(2015 KL173)

Where is it now

Distance from Sun
32.998 AU
True anomaly
78.62°
Distance from Earth
33.527 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 2015 KL173 — 32.998 AU from the Sun 2015 KL173
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 KL173 is 33.527 AU from Earth today (4.6 light-hours).

In the sky

Right ascension
17h 19m 50s
Declination
-18° 53′ 04″
Constellation
Ophiuchus
Distance from Earth
33.53 AU
Elongation from the Sun
56.71° — 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
39.316 AU
Eccentricity
0.3265
Inclination
10.4°
Orbital period
246.5 years
Perihelion
26.479 AU
Aphelion
52.153 AU
Longitude of ascending node
106.07°
Argument of periapsis
76.89°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 9,923.3 LD
25.4984 AU
Tisserand (Jupiter)
5.243

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
20
Data arc
827 days
First observed
21 May 2015
Last observed
25 August 2017
Residual RMS
0.17 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
9.9

Discovery & classification

TNO

Sources