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Trans-Neptunian object

2017 DF156

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(2017 DF156)

2017 DF156 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 35.64 AU to 60.73 AU from the Sun; one orbit takes 334.5 years. Orbit from the JPL solution of 5 June 2024.

Where is it now

Distance from Sun
44.455 AU
True anomaly
87.71°
Distance from Earth
45.111 AU
As of
26 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 2017 DF156 — 44.455 AU from the Sun 2017 DF156
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 DF156 is 45.111 AU from Earth today (6.3 light-hours).

In the sky

Right ascension
10h 52m 46s
Declination
-03° 27′ 50″
Constellation
Leo
Distance from Earth
45.11 AU
Elongation from the Sun
48.23° — 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
48.186 AU
Eccentricity
0.2604
Inclination
10.08°
Orbital period
334.5 years
Perihelion
35.639 AU
Aphelion
60.733 AU
Longitude of ascending node
264.2°
Argument of periapsis
173.13°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 13,486.2 LD
34.6536 AU
Tisserand (Jupiter)
5.894

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
47
Data arc
3 years
First observed
17 January 2015
Last observed
17 January 2018
Residual RMS
0.13 ″
Solution · Otto Matic
5 June 2024

Visual & observation

Absolute magnitude (H)
9.13

Discovery & classification

TNO

Sources