Skip to content
Public Universe
Trans-Neptunian object

2005 CF81

Add to an observing list or journal →

(2005 CF81)

Where is it now

Distance from Sun
35.398 AU
True anomaly
64.33°
Distance from Earth
36.305 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 2005 CF81 — 35.398 AU from the Sun 2005 CF81
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2005 CF81 is 36.305 AU from Earth today (5.0 light-hours).

In the sky

Right ascension
11h 53m 36s
Declination
+01° 05′ 32″
Constellation
Virgo
Distance from Earth
36.3 AU
Elongation from the Sun
24.99° — 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
36.583 AU
Eccentricity
0.0667
Inclination
0.41°
Orbital period
221.3 years
Perihelion
34.145 AU
Aphelion
39.022 AU
Longitude of ascending node
109.91°
Argument of periapsis
3.17°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 12,905.4 LD
33.1611 AU
Tisserand (Jupiter)
5.433

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
23
Data arc
17.16 years
First observed
10 February 2005
Last observed
8 April 2022
Residual RMS
0.25 ″
Solution · Otto Matic
28 April 2022

Visual & observation

Absolute magnitude (H)
8.42

Discovery & classification

TNO

Sources