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Trans-Neptunian object

2023 BX21

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(2023 BX21)

Where is it now

Distance from Sun
45.362 AU
True anomaly
224.61°
Distance from Earth
46.346 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 2023 BX21 — 45.362 AU from the Sun 2023 BX21
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2023 BX21 is 46.346 AU from Earth today (6.4 light-hours).

In the sky

Right ascension
14h 08m 13s
Declination
-11° 44′ 16″
Constellation
Virgo
Distance from Earth
46.35 AU
Elongation from the Sun
7.8° — too close to the Sun to observe

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
42.692 AU
Eccentricity
0.0945
Inclination
1.77°
Orbital period
279 years
Perihelion
38.659 AU
Aphelion
46.725 AU
Longitude of ascending node
172.57°
Argument of periapsis
176.9°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Tisserand (Jupiter)
5.822

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 9).

Observations used
7
Data arc
11 days
First observed
24 January 2023
Last observed
4 February 2023
Residual RMS
0.06 ″

Visual & observation

Absolute magnitude (H)
8.48

Discovery & classification

TNO

Sources