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Asteroid Near-Earth

2019 UN3

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(2019 UN3)

2019 UN3 is an asteroid in the Aten orbit class. Its orbit takes it from 0.78 AU to 1.18 AU from the Sun; one orbit takes 356.4 days. Orbit from the JPL solution of 25 July 2025.

Where is it now

Distance from Sun
0.803 AU
True anomaly
328.79°
Distance from Earth
1.103 AU
As of
2 November 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 — 0.992 AU from the Sun Earth 2019 UN3 — 0.803 AU from the Sun 2019 UN3
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2019 UN3 is 1.103 AU from Earth today (9.2 light-minutes).

In the sky

Right ascension
12h 43m 00s
Declination
+20° 10′ 24″
Constellation
Coma Berenices
Distance from Earth
1.11 AU
Elongation from the Sun
44.54° — near the Sun — look low at dusk or dawn

Favours the northern hemisphere; low or below the horizon from far south.

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
0.984 AU
Eccentricity
0.2032
Inclination
32.18°
Orbital period
356.4 days
Perihelion
0.784 AU
Aphelion
1.184 AU
Longitude of ascending node
24.49°
Argument of periapsis
119.55°
Epoch · J2000
2458778.5
Orbit class · ATE
Aten
Earth MOID · 19.0 LD
0.0488 AU
Tisserand (Jupiter)
6.01

Orbit quality

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

Observations used
40
Data arc
5 days
First observed
19 October 2019
Last observed
24 October 2019
Residual RMS
0.36 ″
Solution · Otto Matic
25 July 2025

Visual & observation

Absolute magnitude (H)
24.39

Discovery & classification

Aten Near-Earth Object

Close approaches 6 on record

When (UTC) Body Distance Lunar distances Relative speed
2028-12-08 13:12:00 Venus 0.1224 AU 47.6 LD 18.4 km/s

Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.

Sources