2019 WM4 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.67 AU to 1.38 AU from the Sun; one orbit takes 380.1 days. Orbit from the JPL solution of 15 April 2021.
Where is it now
- Distance from Sun
- 0.747 AU
- True anomaly
- 308.01°
- Distance from Earth
- 1.726 AU
- As of
- 3 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.
In the sky
- Right ascension
- 15h 04m 00s
- Declination
- -16° 02′ 22″
- Constellation
- Libra
- Distance from Earth
- 1.72 AU
- Elongation from the Sun
- 6.2° — too close to the Sun to observe
Favours the southern hemisphere; low or below the horizon from far north.
From your location
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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
- 1.027 AU
- Eccentricity
- 0.3445
- Inclination
- 10.49°
- Orbital period
- 380.1 days
- Perihelion
- 0.673 AU
- Aphelion
- 1.381 AU
- Longitude of ascending node
- 71.84°
- Argument of periapsis
- 214.93°
- Epoch · J2000
- 2458814.5
- Orbit class · APO
- Apollo
- Earth MOID · 43.1 LD
- 0.1107 AU
- Tisserand (Jupiter)
- 5.887
Orbit quality
Orbit very uncertain — the object may be effectively lost (uncertainty code 8).
- Observations used
- 15
- Data arc
- 9 days
- First observed
- 26 November 2019
- Last observed
- 5 December 2019
- Residual RMS
- 0.43 ″
- Solution · Otto Matic
- 15 April 2021
Visual & observation
- Absolute magnitude (H)
- 23.1
Discovery & classification
Close approaches 44 on record
Top-down view of the ecliptic, Earth at the centre, for the 2063-03-13 16:20 UTC close approach of 2019 WM4. Catalogue miss distance 129.7 LD · 4.98 × 10⁷ km. The curve is the geocentric path from 2063-03-10 to 2063-03-16, 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.
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2063-03-13 16:20:00 | Earth | 0.3332 AU | 129.7 LD | 20 km/s |
| 2069-11-01 09:59:00 | Earth | 0.1399 AU | 54.5 LD | 9.6 km/s |
| 2070-11-04 05:32:00 | Earth | 0.1986 AU | 77.3 LD | 16.4 km/s |
| 2071-11-13 22:57:00 | Earth | 0.4315 AU | 167.9 LD | 24.1 km/s |
| 2072-09-01 09:49:00 | Venus | 0.1427 AU | 55.5 LD | 16.2 km/s |
| 2086-03-18 05:56:00 | Venus | 0.1015 AU | 39.5 LD | 14.3 km/s |
| 2088-03-12 02:14:00 | Earth | 0.3504 AU | 136.4 LD | 20.6 km/s |
| 2089-03-25 22:27:00 | Earth | 0.1752 AU | 68.2 LD | 13.1 km/s |
| 2095-11-03 17:50:00 | Earth | 0.175 AU | 68.1 LD | 15.6 km/s |
| 2096-11-12 05:25:00 | Earth | 0.4039 AU | 157.2 LD | 23.2 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB