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Trans-Neptunian object

1998 UR43

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(1998 UR43)

Where is it now

Distance from Sun
31.414 AU
True anomaly
26.59°
Distance from Earth
31.179 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 1998 UR43 — 31.414 AU from the Sun 1998 UR43
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 1998 UR43 is 31.179 AU from Earth today (4.3 light-hours).

In the sky

Right ascension
06h 52m 44s
Declination
+29° 16′ 33″
Constellation
Gemini
Distance from Earth
31.18 AU
Elongation from the Sun
102.99° — 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
39.81 AU
Eccentricity
0.2263
Inclination
8.76°
Orbital period
251.2 years
Perihelion
30.801 AU
Aphelion
48.82 AU
Longitude of ascending node
53.85°
Argument of periapsis
19.66°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 11,603.7 LD
29.8163 AU
Tisserand (Jupiter)
5.456

Orbit quality

Orbit reasonably well determined (uncertainty code 3).

Observations used
40
Data arc
27.22 years
First observed
22 October 1998
Last observed
11 January 2026
Residual RMS
0.37 ″
Solution · Otto Matic
5 June 2026

Visual & observation

Absolute magnitude (H)
8.33

Discovery & classification

TNO

Sources