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Trans-Neptunian object

1999 CT153

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(1999 CT153)

Where is it now

Distance from Sun
42.952 AU
True anomaly
69.39°
Distance from Earth
43.932 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 1999 CT153 — 42.952 AU from the Sun 1999 CT153
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 1999 CT153 is 43.932 AU from Earth today (6.1 light-hours).

In the sky

Right ascension
13h 13m 34s
Declination
-04° 59′ 55″
Constellation
Virgo
Distance from Earth
43.93 AU
Elongation from the Sun
10.74° — 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
44.939 AU
Eccentricity
0.101
Inclination
4.54°
Orbital period
301.3 years
Perihelion
40.398 AU
Aphelion
49.479 AU
Longitude of ascending node
163.09°
Argument of periapsis
326.23°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,338.8 LD
39.414 AU
Tisserand (Jupiter)
5.945

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
27
Data arc
17.95 years
First observed
11 February 1999
Last observed
23 January 2017
Residual RMS
0.1 ″
Solution · Otto Matic
14 February 2025

Visual & observation

Absolute magnitude (H)
8.31

Discovery & classification

Also known as 2016 GV370

TNO

Sources