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Trans-Neptunian object

2017 CD56

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(2017 CD56)

Where is it now

Distance from Sun
42.025 AU
True anomaly
203.09°
Distance from Earth
42.723 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 2017 CD56 — 42.025 AU from the Sun 2017 CD56
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 CD56 is 42.723 AU from Earth today (5.9 light-hours).

In the sky

Right ascension
10h 25m 58s
Declination
-04° 19′ 57″
Constellation
Sextans
Distance from Earth
42.71 AU
Elongation from the Sun
45.96° — 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
39.577 AU
Eccentricity
0.0681
Inclination
13.48°
Orbital period
249 years
Perihelion
36.883 AU
Aphelion
42.27 AU
Longitude of ascending node
256.33°
Argument of periapsis
59.69°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 13,967.2 LD
35.8896 AU
Tisserand (Jupiter)
5.483

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
25
Data arc
386 days
First observed
12 February 2016
Last observed
4 March 2017
Residual RMS
0.13 ″
Solution · Otto Matic
23 May 2024

Visual & observation

Absolute magnitude (H)
8.32

Discovery & classification

TNO

Sources