Skip to content
Public Universe
Trans-Neptunian object

2019 O4

Add to an observing list or journal →

(A/2019 O4)

Where is it now

Distance from Sun
15.666 AU
True anomaly
129.08°
Distance from Earth
16.507 AU
As of
15 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 — 0.997 AU from the Sun Earth 2019 O4 — 15.666 AU from the Sun 2019 O4
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2019 O4 is 16.507 AU from Earth today (2.3 light-hours).

In the sky

Right ascension
11h 16m 22s
Declination
-05° 28′ 20″
Constellation
Leo
Distance from Earth
16.51 AU
Elongation from the Sun
31.88° — near the Sun — look low at dusk or dawn

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
32.882 AU
Eccentricity
0.8892
Inclination
115.09°
Orbital period
188.6 years
Perihelion
3.644 AU
Aphelion
62.119 AU
Longitude of ascending node
354.92°
Argument of periapsis
61.81°
Epoch · J2000
2458926.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 1,170.4 LD
3.0073 AU
Tisserand (Jupiter)
-0.817

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
71
Data arc
2.76 years
First observed
6 August 2018
Last observed
9 May 2021
Residual RMS
0.57 ″
Solution · Otto Matic
1 June 2021

Visual & observation

Absolute magnitude (H)
15.48

Discovery & classification

Also known as A/2019 O4

TNO

Sources