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Trans-Neptunian object

2006 HD123

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(2006 HD123)

Where is it now

Distance from Sun
39.712 AU
True anomaly
344.47°
Distance from Earth
40.249 AU
As of
21 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 — 0.995 AU from the Sun Earth 2006 HD123 — 39.712 AU from the Sun 2006 HD123
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2006 HD123 is 40.249 AU from Earth today (5.6 light-hours).

In the sky

Right ascension
17h 38m 22s
Declination
-23° 54′ 18″
Constellation
Ophiuchus
Distance from Earth
40.26 AU
Elongation from the Sun
56.3° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
44.284 AU
Eccentricity
0.1064
Inclination
2.51°
Orbital period
294.7 years
Perihelion
39.572 AU
Aphelion
48.996 AU
Longitude of ascending node
73.23°
Argument of periapsis
208.56°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,004.7 LD
38.5555 AU
Tisserand (Jupiter)
5.913

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
11
Data arc
824 days
First observed
25 April 2004
Last observed
28 July 2006
Residual RMS
0.2 ″
Solution · Otto Matic
16 November 2022

Visual & observation

Absolute magnitude (H)
7.45

Discovery & classification

TNO

Sources