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Trans-Neptunian object

2009 KJ30

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(2009 KJ30)

2009 KJ30 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 37.76 AU to 55.34 AU from the Sun; one orbit takes 317.6 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
38.526 AU
True anomaly
29.05°
Distance from Earth
38.984 AU
As of
24 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 2009 KJ30 — 38.526 AU from the Sun 2009 KJ30
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2009 KJ30 is 38.984 AU from Earth today (5.4 light-hours).

In the sky

Right ascension
18h 10m 41s
Declination
-11° 45′ 44″
Constellation
Serpens
Distance from Earth
38.99 AU
Elongation from the Sun
61.37° — well clear of the Sun

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
46.55 AU
Eccentricity
0.1889
Inclination
30.56°
Orbital period
317.6 years
Perihelion
37.756 AU
Aphelion
55.344 AU
Longitude of ascending node
253.27°
Argument of periapsis
354.65°
Epoch · J2000
2454978.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,299.6 LD
36.7436 AU
Tisserand (Jupiter)
5.17

Orbit quality

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

Observations used
17
Data arc
2 days
First observed
25 May 2009
Last observed
27 May 2009
Residual RMS
0.14 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
8.34

Discovery & classification

TNO

Sources