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Trans-Neptunian object

2001 RW143

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(2001 RW143)

Where is it now

Distance from Sun
41.965 AU
True anomaly
36.7°
Distance from Earth
41.04 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 2001 RW143 — 41.965 AU from the Sun 2001 RW143
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2001 RW143 is 41.04 AU from Earth today (5.7 light-hours).

In the sky

Right ascension
03h 06m 05s
Declination
+14° 19′ 45″
Constellation
Aries
Distance from Earth
41.04 AU
Elongation from the Sun
158.66° — 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
43.209 AU
Eccentricity
0.0354
Inclination
2.96°
Orbital period
284 years
Perihelion
41.681 AU
Aphelion
44.737 AU
Longitude of ascending node
131.54°
Argument of periapsis
239.38°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,832.0 LD
40.6811 AU
Tisserand (Jupiter)
5.872

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
20
Data arc
12.07 years
First observed
12 September 2001
Last observed
6 October 2013
Residual RMS
0.25 ″
Solution · Otto Matic
14 April 2021

Visual & observation

Absolute magnitude (H)
7

Discovery & classification

TNO

Sources