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Trans-Neptunian object

1999 RB215

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(1999 RB215)

1999 RB215 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 31.51 AU to 64.22 AU from the Sun; one orbit takes 331.2 years. Orbit from the JPL solution of 14 April 2021.

Where is it now

Distance from Sun
37.497 AU
True anomaly
68.1°
Distance from Earth
36.637 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 1999 RB215 — 37.497 AU from the Sun 1999 RB215
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 1999 RB215 is 36.637 AU from Earth today (5.1 light-hours).

In the sky

Right ascension
03h 54m 30s
Declination
+27° 10′ 39″
Constellation
Taurus
Distance from Earth
36.63 AU
Elongation from the Sun
150.22° — 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
47.865 AU
Eccentricity
0.3417
Inclination
7.86°
Orbital period
331.2 years
Perihelion
31.51 AU
Aphelion
64.22 AU
Longitude of ascending node
5.04°
Argument of periapsis
348.57°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 11,871.3 LD
30.5039 AU
Tisserand (Jupiter)
5.756

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
23
Data arc
12.14 years
First observed
6 September 1999
Last observed
26 October 2011
Residual RMS
0.19 ″
Solution · Otto Matic
14 April 2021

Visual & observation

Absolute magnitude (H)
9.4

Discovery & classification

TNO

Sources