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Trans-Neptunian object

1999 RX215

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(1999 RX215)

1999 RX215 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 40.38 AU to 53.4 AU from the Sun; one orbit takes 321.1 years. Orbit from the JPL solution of 21 September 2022.

Where is it now

Distance from Sun
44.242 AU
True anomaly
73.52°
Distance from Earth
43.402 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 1999 RX215 — 44.242 AU from the Sun 1999 RX215
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 1999 RX215 is 43.402 AU from Earth today (6.0 light-hours).

In the sky

Right ascension
23h 56m 16s
Declination
-01° 22′ 50″
Constellation
Pisces
Distance from Earth
43.41 AU
Elongation from the Sun
146.42° — well clear of the Sun

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
46.889 AU
Eccentricity
0.1389
Inclination
0.89°
Orbital period
321.1 years
Perihelion
40.377 AU
Aphelion
53.402 AU
Longitude of ascending node
99.25°
Argument of periapsis
186.54°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,318.0 LD
39.3605 AU
Tisserand (Jupiter)
6.056

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
22
Data arc
22.97 years
First observed
8 September 1999
Last observed
27 August 2022
Residual RMS
0.14 ″
Solution · Otto Matic
21 September 2022

Visual & observation

Absolute magnitude (H)
7.43

Discovery & classification

TNO

Sources