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Trans-Neptunian object

2017 CG56

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(2017 CG56)

2017 CG56 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 19.09 AU to 75.83 AU from the Sun; one orbit takes 327 years. Orbit from the JPL solution of 26 June 2024.

Where is it now

Distance from Sun
19.683 AU
True anomaly
23.13°
Distance from Earth
20.636 AU
As of
25 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 CG56 — 19.683 AU from the Sun 2017 CG56
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 CG56 is 20.636 AU from Earth today (2.9 light-hours).

In the sky

Right ascension
13h 10m 10s
Declination
-23° 14′ 32″
Constellation
Hydra
Distance from Earth
20.64 AU
Elongation from the Sun
16.31° — too close to the Sun to observe

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
47.46 AU
Eccentricity
0.5977
Inclination
15.6°
Orbital period
327 years
Perihelion
19.091 AU
Aphelion
75.829 AU
Longitude of ascending node
283.43°
Argument of periapsis
257.78°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 7,056.4 LD
18.1318 AU
Tisserand (Jupiter)
4.774

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
18
Data arc
440 days
First observed
12 February 2016
Last observed
27 April 2017
Residual RMS
0.12 ″
Solution · Otto Matic
26 June 2024

Visual & observation

Absolute magnitude (H)
11.6

Discovery & classification

TNO

Sources