Skip to content
Public Universe
Trans-Neptunian object

137295

Add to an observing list or journal →

137295 (1999 RB216)

137295 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 33.68 AU to 62.02 AU from the Sun; one orbit takes 331 years. Discovered 8 September 1999 by Trujillo, C. A., Jewitt, D. C., Luu, J. X.. Orbit from the JPL solution of 13 February 2025.

Where is it now

Distance from Sun
34.427 AU
True anomaly
25.1°
Distance from Earth
33.495 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 137295 — 34.427 AU from the Sun 137295
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 137295 is 33.495 AU from Earth today (4.6 light-hours).

In the sky

Right ascension
03h 21m 46s
Declination
+07° 31′ 55″
Constellation
Cetus
Distance from Earth
33.49 AU
Elongation from the Sun
160.12° — 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
47.853 AU
Eccentricity
0.2961
Inclination
12.69°
Orbital period
331 years
Perihelion
33.685 AU
Aphelion
62.021 AU
Longitude of ascending node
175.75°
Argument of periapsis
209.37°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 12,723.4 LD
32.6934 AU
Tisserand (Jupiter)
5.76

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
333
Data arc
25.3 years
First observed
8 September 1999
Last observed
25 December 2024
Residual RMS
0.63 ″
Solution · Otto Matic
13 February 2025

Visual & observation

Absolute magnitude (H)
7.4

Discovery & classification

Discovered by
Trujillo, C. A., Jewitt, D. C., Luu, J. X.
Discovery date
8 September 1999
Discovery site
Mauna Kea

Also known as 1999 RB216

TNO

Sources