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Trans-Neptunian object

621861

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621861 (2011 EY90)

621861 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 35.36 AU to 60.22 AU from the Sun; one orbit takes 330.4 years. Discovered 11 March 2011 by Pan-STARRS 1. Orbit from the JPL solution of 10 April 2025.

Where is it now

Distance from Sun
35.584 AU
True anomaly
345.88°
Distance from Earth
36.573 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 621861 — 35.584 AU from the Sun 621861
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 621861 is 36.573 AU from Earth today (5.1 light-hours).

In the sky

Right ascension
14h 14m 07s
Declination
-16° 51′ 44″
Constellation
Virgo
Distance from Earth
36.57 AU
Elongation from the Sun
5° — too close to the Sun to observe

Favours the southern hemisphere; low or below the horizon from far north.

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
47.79 AU
Eccentricity
0.26
Inclination
8.01°
Orbital period
330.4 years
Perihelion
35.362 AU
Aphelion
60.218 AU
Longitude of ascending node
241.2°
Argument of periapsis
349.78°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 13,369.0 LD
34.3524 AU
Tisserand (Jupiter)
5.904

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
122
Data arc
13.97 years
First observed
11 March 2011
Last observed
27 February 2025
Residual RMS
0.76 ″
Solution · Otto Matic
10 April 2025

Visual & observation

Absolute magnitude (H)
6.92

Discovery & classification

Discovered by
Pan-STARRS 1
Discovery date
11 March 2011
Discovery site
Haleakala

Also known as 2011 EY90

TNO

Sources