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Trans-Neptunian object

2021 LT57

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(2021 LT57)

Where is it now

Distance from Sun
44.918 AU
True anomaly
134.67°
Distance from Earth
45.636 AU
As of
17 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 LT57 — 44.918 AU from the Sun 2021 LT57
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 LT57 is 45.636 AU from Earth today (6.3 light-hours).

In the sky

Right ascension
16h 22m 00s
Declination
-01° 24′ 16″
Constellation
Serpens
Distance from Earth
45.65 AU
Elongation from the Sun
42.62° — 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
41.669 AU
Eccentricity
0.1227
Inclination
23.36°
Orbital period
269 years
Perihelion
36.554 AU
Aphelion
46.784 AU
Longitude of ascending node
186.41°
Argument of periapsis
285.76°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Tisserand (Jupiter)
5.281

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
26
First observed
2021-??-??
Last observed
22 May 2023
Residual RMS
0.32 ″

Visual & observation

Absolute magnitude (H)
8.8

Discovery & classification

TNO

Sources