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Trans-Neptunian object

2021 RS237

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(2021 RS237)

Where is it now

Distance from Sun
42.595 AU
True anomaly
337.61°
Distance from Earth
41.7 AU
As of
19 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 — 0.996 AU from the Sun Earth 2021 RS237 — 42.595 AU from the Sun 2021 RS237
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 RS237 is 41.7 AU from Earth today (5.8 light-hours).

In the sky

Right ascension
00h 00m 33s
Declination
-00° 15′ 11″
Constellation
Pisces
Distance from Earth
41.7 AU
Elongation from the Sun
153.34° — 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
43.056 AU
Eccentricity
0.0116
Inclination
1.25°
Orbital period
282.5 years
Perihelion
42.558 AU
Aphelion
43.553 AU
Longitude of ascending node
167.62°
Argument of periapsis
215.4°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 16,174.2 LD
41.5604 AU
Tisserand (Jupiter)
5.872

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
10
Data arc
767 days
First observed
28 August 2019
Last observed
3 October 2021
Residual RMS
0.1 ″
Solution · Otto Matic
30 November 2023

Visual & observation

Absolute magnitude (H)
7.89

Discovery & classification

TNO

Sources