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Trans-Neptunian object

2021 LX57

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(2021 LX57)

Where is it now

Distance from Sun
25.119 AU
True anomaly
340.43°
Distance from Earth
25.689 AU
As of
18 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 LX57 — 25.119 AU from the Sun 2021 LX57
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 LX57 is 25.689 AU from Earth today (3.6 light-hours).

In the sky

Right ascension
17h 08m 56s
Declination
-00° 33′ 45″
Constellation
Ophiuchus
Distance from Earth
25.69 AU
Elongation from the Sun
54.15° — near the Sun — look low at dusk or dawn

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
41.874 AU
Eccentricity
0.4102
Inclination
26.95°
Orbital period
271 years
Perihelion
24.697 AU
Aphelion
59.051 AU
Longitude of ascending node
202.33°
Argument of periapsis
78.33°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Tisserand (Jupiter)
4.737

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
19
First observed
2020-??-??
Last observed
28 June 2022
Residual RMS
0.13 ″

Visual & observation

Absolute magnitude (H)
9.78

Discovery & classification

TNO

Sources