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Trans-Neptunian object

523601

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523601 (2003 UY413)

523601 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 37.53 AU to 57.32 AU from the Sun; one orbit takes 326.6 years. Discovered 19 October 2003 by M. E. Brown, C. A. Trujillo, D. Rabinowitz. Orbit from the JPL solution of 7 June 2026.

Where is it now

Distance from Sun
43.219 AU
True anomaly
76.25°
Distance from Earth
42.29 AU
As of
25 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 — 0.994 AU from the Sun Earth 523601 — 43.219 AU from the Sun 523601
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 523601 is 42.29 AU from Earth today (5.9 light-hours).

In the sky

Right ascension
02h 12m 20s
Declination
+33° 11′ 37″
Constellation
Triangulum
Distance from Earth
42.29 AU
Elongation from the Sun
158.95° — 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
47.426 AU
Eccentricity
0.2087
Inclination
20.76°
Orbital period
326.6 years
Perihelion
37.531 AU
Aphelion
57.322 AU
Longitude of ascending node
341.35°
Argument of periapsis
346.02°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,213.5 LD
36.5224 AU
Tisserand (Jupiter)
5.632

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
272
Data arc
29.27 years
First observed
12 October 1996
Last observed
20 January 2026
Residual RMS
0.53 ″
Solution · Otto Matic
7 June 2026

Visual & observation

Absolute magnitude (H)
5.36

Discovery & classification

Discovered by
M. E. Brown, C. A. Trujillo, D. Rabinowitz
Discovery date
19 October 2003
Discovery site
Palomar Mountain

Also known as 2003 UY413 · 1996 TC68

TNO

Sources