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Trans-Neptunian object

145453

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145453 (2005 RR43)

Where is it now

Distance from Sun
40.642 AU
True anomaly
69.61°
Distance from Earth
40.035 AU
As of
19 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 145453 — 40.642 AU from the Sun 145453
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 145453 is 40.035 AU from Earth today (5.5 light-hours).

In the sky

Right ascension
05h 14m 36s
Declination
+18° 46′ 43″
Constellation
Taurus
Distance from Earth
40.02 AU
Elongation from the Sun
127.91° — well clear of the Sun

Favours the northern hemisphere; low or below the horizon from far south.

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
43.474 AU
Eccentricity
0.1399
Inclination
28.45°
Orbital period
286.7 years
Perihelion
37.392 AU
Aphelion
49.556 AU
Longitude of ascending node
85.87°
Argument of periapsis
281.6°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,208.1 LD
36.5086 AU
Tisserand (Jupiter)
5.153

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
1,348
Data arc
49.25 years
First observed
18 November 1976
Last observed
19 February 2026
Residual RMS
0.49 ″
Solution · Otto Matic
6 June 2026

Physical properties

Rotation period
5.08 hours

Visual & observation

Absolute magnitude (H)
4.15

Discovery & classification

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

Also known as 2005 RR43

TNO

Sources