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Trans-Neptunian object

2021 XD7

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(2021 XD7)

2021 XD7 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 34.54 AU to 63.19 AU from the Sun; one orbit takes 341.6 years. Orbit from the JPL solution of 11 March 2026.

Where is it now

Distance from Sun
35.529 AU
True anomaly
28.7°
Distance from Earth
35.102 AU
As of
26 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 2021 XD7 — 35.529 AU from the Sun 2021 XD7
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 XD7 is 35.102 AU from Earth today (4.9 light-hours).

In the sky

Right ascension
06h 37m 15s
Declination
+22° 05′ 56″
Constellation
Gemini
Distance from Earth
35.1 AU
Elongation from the Sun
114.86° — well clear of the Sun

Favours the northern hemisphere; low or below the horizon from far south.

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
48.864 AU
Eccentricity
0.2932
Inclination
12.01°
Orbital period
341.6 years
Perihelion
34.539 AU
Aphelion
63.189 AU
Longitude of ascending node
272.23°
Argument of periapsis
156.34°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 13,059.1 LD
33.5561 AU
Tisserand (Jupiter)
5.838

Orbit quality

Orbit reasonably well determined (uncertainty code 3).

Observations used
141
Data arc
18.11 years
First observed
9 November 2007
Last observed
19 December 2025
Residual RMS
0.33 ″
Solution · Otto Matic
11 March 2026

Visual & observation

Absolute magnitude (H)
6.91

Discovery & classification

TNO

Sources