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Trans-Neptunian object

144897

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144897 (2004 UX10)

Where is it now

Distance from Sun
39.613 AU
True anomaly
108.95°
Distance from Earth
38.779 AU
As of
16 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 144897 — 39.613 AU from the Sun 144897
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 144897 is 38.779 AU from Earth today (5.4 light-hours).

In the sky

Right ascension
03h 42m 56s
Declination
+09° 43′ 52″
Constellation
Taurus
Distance from Earth
38.78 AU
Elongation from the Sun
146.6° — 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
39.177 AU
Eccentricity
0.0384
Inclination
9.53°
Orbital period
245.2 years
Perihelion
37.674 AU
Aphelion
40.68 AU
Longitude of ascending node
148.04°
Argument of periapsis
158.01°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,267.2 LD
36.6603 AU
Tisserand (Jupiter)
5.541

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
1,456
Data arc
72.56 years
First observed
15 August 1953
Last observed
9 March 2026
Residual RMS
0.52 ″
Solution · Otto Matic
6 June 2026

Physical properties

Rotation period
7.58 hours

Visual & observation

Absolute magnitude (H)
4.38

Discovery & classification

Discovered by
Becker, A. C., Puckett, A. W., Kubica, J.
Discovery date
20 October 2004
Discovery site
Apache Point

Also known as 2004 UX10

TNO

Sources