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Trans-Neptunian object

Ritona

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145452 Ritona (2005 RN43)

Where is it now

Distance from Sun
40.58 AU
True anomaly
348.69°
Distance from Earth
39.716 AU
As of
17 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 — 0.996 AU from the Sun Earth Ritona — 40.58 AU from the Sun Ritona
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Ritona is 39.716 AU from Earth today (5.5 light-hours).

In the sky

Right ascension
23h 32m 43s
Declination
+01° 38′ 04″
Constellation
Pisces
Distance from Earth
39.72 AU
Elongation from the Sun
148.89° — well clear of the Sun

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
41.498 AU
Eccentricity
0.0226
Inclination
19.28°
Orbital period
267.3 years
Perihelion
40.562 AU
Aphelion
42.434 AU
Longitude of ascending node
186.99°
Argument of periapsis
178.74°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,395.5 LD
39.5596 AU
Tisserand (Jupiter)
5.455

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
1,783
Data arc
71.51 years
First observed
2 June 1954
Last observed
6 December 2025
Residual RMS
0.4 ″
Solution · Otto Matic
25 August 2026

Physical properties

Rotation period
6.95 hours

Visual & observation

Absolute magnitude (H)
3.69

Discovery & classification

Discovered by
Becker, A. C., Puckett, A. W., Kubica, J.
Discovery date
10 September 2005
Discovery site
Apache Point

Ritona is a goddess of river fords among the Celtic tribe of the Treveri located in the Moselle river valley.

Also known as 145452 · 2005 RN43

Named TNO

Sources