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Trans-Neptunian object

2009 DO143

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(2009 DO143)

Where is it now

Distance from Sun
43.171 AU
True anomaly
273.68°
Distance from Earth
44.154 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 2009 DO143 — 43.171 AU from the Sun 2009 DO143
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2009 DO143 is 44.154 AU from Earth today (6.1 light-hours).

In the sky

Right ascension
13h 49m 39s
Declination
-02° 05′ 47″
Constellation
Virgo
Distance from Earth
44.15 AU
Elongation from the Sun
8.9° — 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
44.158 AU
Eccentricity
0.1213
Inclination
11.58°
Orbital period
293.4 years
Perihelion
38.799 AU
Aphelion
49.516 AU
Longitude of ascending node
75.18°
Argument of periapsis
216.7°
Epoch · J2000
2454897.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,707.4 LD
37.7914 AU
Tisserand (Jupiter)
5.783

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 8).

Observations used
10
Data arc
68 days
First observed
18 February 2009
Last observed
27 April 2009
Residual RMS
0.15 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
8.86

Discovery & classification

TNO

Sources