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Trans-Neptunian object

523640

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523640 (2010 RO64)

523640 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 41.2 AU to 52.84 AU from the Sun; one orbit takes 322.5 years. Discovered 10 September 2010 by D. L. Rabinowitz, M. E. Schwamb, S. Tourtellotte. Orbit from the JPL solution of 7 June 2026.

Where is it now

Distance from Sun
41.385 AU
True anomaly
16.35°
Distance from Earth
40.402 AU
As of
24 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 523640 — 41.385 AU from the Sun 523640
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 523640 is 40.402 AU from Earth today (5.6 light-hours).

In the sky

Right ascension
02h 13m 02s
Declination
+04° 22′ 42″
Constellation
Cetus
Distance from Earth
40.4 AU
Elongation from the Sun
171.51° — near opposition — up most of the night

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
47.022 AU
Eccentricity
0.1238
Inclination
17.03°
Orbital period
322.5 years
Perihelion
41.201 AU
Aphelion
52.844 AU
Longitude of ascending node
60.9°
Argument of periapsis
314.2°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,654.2 LD
40.2244 AU
Tisserand (Jupiter)
5.815

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
539
Data arc
21.45 years
First observed
7 September 2004
Last observed
18 February 2026
Residual RMS
0.39 ″
Solution · Otto Matic
7 June 2026

Visual & observation

Absolute magnitude (H)
5.21

Discovery & classification

Discovered by
D. L. Rabinowitz, M. E. Schwamb, S. Tourtellotte
Discovery date
10 September 2010
Discovery site
La Silla

Also known as 2010 RO64

TNO

Sources