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Asteroid Near-Earth

2019 WC4

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(2019 WC4)

Where is it now

Distance from Sun
1.358 AU
True anomaly
168.48°
Distance from Earth
0.54 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 2019 WC4 — 1.358 AU from the Sun 2019 WC4
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2019 WC4 is 0.54 AU from Earth today (4.5 light-minutes).

In the sky

Right ascension
21h 46m 00s
Declination
+12° 57′ 25″
Constellation
Pegasus
Distance from Earth
0.55 AU
Elongation from the Sun
120.87° — 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
0.93 AU
Eccentricity
0.4877
Inclination
9.83°
Orbital period
327.8 days
Perihelion
0.477 AU
Aphelion
1.384 AU
Longitude of ascending node
289.82°
Argument of periapsis
272.8°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 33.4 LD
0.0858 AU
Tisserand (Jupiter)
6.32

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
42
Data arc
6.76 years
First observed
25 November 2019
Last observed
30 August 2026
Residual RMS
0.48 ″
Solution · Otto Matic
31 August 2026

Visual & observation

Absolute magnitude (H)
22.4

Discovery & classification

Aten Near-Earth Object

Close approaches 132 on record

Flyby geometry
Ecliptic flyby of 2019 WC4 at 2028-12-13 17:41 UTC Top-down view of the ecliptic, Earth at the centre, for the 2028-12-13 17:41 UTC close approach of 2019 WC4. Catalogue miss distance 36.1 LD · 1.39 × 10⁷ km. The curve is the geocentric path from 2028-12-10 to 2028-12-16, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. At closest approach the object is north of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 11 Dec 36.1 LD · 1.39 × 10⁷ km 2028-12-13 17:41 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2028-12-13 17:41 UTC close approach of 2019 WC4. Catalogue miss distance 36.1 LD · 1.39 × 10⁷ km. The curve is the geocentric path from 2028-12-10 to 2028-12-16, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. At closest approach the object is north of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate.

JPL Horizons

When (UTC) Body Distance Lunar distances Relative speed
2028-12-13 17:41:00 Earth 0.0928 AU 36.1 LD 14.5 km/s
2032-09-25 05:14:00 Mercury 0.0942 AU 36.6 LD 13.7 km/s
2032-09-25 05:14:00 Merc 0.0942 AU 36.6 LD 13.7 km/s
2032-10-19 00:56:00 Venus 0.0436 AU 17.0 LD 19.9 km/s
2037-12-08 14:59:00 Earth 0.1435 AU 55.8 LD 19 km/s
2042-08-10 05:40:00 Mercury 0.0994 AU 38.7 LD 13.7 km/s
2042-08-10 05:40:00 Merc 0.0994 AU 38.7 LD 13.7 km/s
2043-08-24 05:16:00 Earth 0.1422 AU 55.4 LD 18.2 km/s
2044-06-17 20:36:00 Venus 0.1233 AU 48.0 LD 14.1 km/s
2047-11-14 07:18:00 Venus 0.0619 AU 24.1 LD 16.3 km/s

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

Sources