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Trans-Neptunian object

508770

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508770 (1995 WY2)

508770 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 40.72 AU to 52.83 AU from the Sun; one orbit takes 319.9 years. Discovered 18 November 1995 by Jewitt, D. C., Luu, J. X.. Orbit from the JPL solution of 13 February 2025.

Where is it now

Distance from Sun
44.162 AU
True anomaly
288.64°
Distance from Earth
44.051 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 508770 — 44.162 AU from the Sun 508770
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 508770 is 44.051 AU from Earth today (6.1 light-hours).

In the sky

Right ascension
07h 50m 41s
Declination
+21° 58′ 49″
Constellation
Gemini
Distance from Earth
44.04 AU
Elongation from the Sun
96.61° — 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
46.776 AU
Eccentricity
0.1295
Inclination
1.65°
Orbital period
319.9 years
Perihelion
40.717 AU
Aphelion
52.835 AU
Longitude of ascending node
78.72°
Argument of periapsis
106.87°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,457.8 LD
39.7197 AU
Tisserand (Jupiter)
6.055

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
16
Data arc
29.02 years
First observed
23 December 1995
Last observed
31 December 2024
Residual RMS
0.3 ″
Solution · Otto Matic
13 February 2025

Visual & observation

Absolute magnitude (H)
7.1

Discovery & classification

Discovered by
Jewitt, D. C., Luu, J. X.
Discovery date
18 November 1995
Discovery site
Mauna Kea

Also known as 1995 WY2

TNO

Sources