2018 HM is an asteroid in the Apollo orbit class. Its orbit takes it from 0.95 AU to 1.11 AU from the Sun; one orbit takes 381.5 days. Orbit from the JPL solution of 15 April 2021.
Where is it now
- Distance from Sun
- 1.095 AU
- True anomaly
- 145.32°
- Distance from Earth
- 1.9 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
- 16h 23m 55s
- Declination
- -12° 27′ 04″
- Constellation
- Ophiuchus
- Distance from Earth
- 1.9 AU
- Elongation from the Sun
- 25.69° — 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.
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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
- 1.029 AU
- Eccentricity
- 0.0797
- Inclination
- 17.58°
- Orbital period
- 381.5 days
- Perihelion
- 0.947 AU
- Aphelion
- 1.111 AU
- Longitude of ascending node
- 205.57°
- Argument of periapsis
- 278.45°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 3.0 LD
- 0.0077 AU
- Tisserand (Jupiter)
- 5.9
Orbit quality
Orbit poorly determined (uncertainty code 7).
- Observations used
- 30
- Data arc
- 2 days
- First observed
- 18 April 2018
- Last observed
- 20 April 2018
- Residual RMS
- 0.74 ″
- Solution · Otto Matic
- 15 April 2021
Visual & observation
- Absolute magnitude (H)
- 27.3
Discovery & classification
Close approaches 37 on record
Top-down view of the ecliptic, Earth at the centre, for the 2039-10-18 06:11 UTC close approach of 2018 HM. Catalogue miss distance 112.6 LD · 4.33 × 10⁷ km. The curve is the geocentric path from 2039-10-15 to 2039-10-21, 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 south 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 |
|---|---|---|---|---|
| 2039-10-18 06:11:00 | Earth | 0.2893 AU | 112.6 LD | 13.7 km/s |
| 2040-04-12 15:58:00 | Earth | 0.4146 AU | 161.3 LD | 13.4 km/s |
| 2040-10-20 08:22:00 | Earth | 0.0417 AU | 16.2 LD | 9.4 km/s |
| 2041-04-11 14:40:00 | Earth | 0.1486 AU | 57.8 LD | 9.4 km/s |
| 2041-10-14 02:41:00 | Earth | 0.2423 AU | 94.3 LD | 10.1 km/s |
| 2042-04-19 13:52:00 | Earth | 0.1189 AU | 46.3 LD | 10.6 km/s |
| 2043-04-30 11:33:00 | Earth | 0.388 AU | 151.0 LD | 16.1 km/s |
| 2062-10-12 09:52:00 | Earth | 0.496 AU | 193.0 LD | 18.8 km/s |
| 2064-10-20 00:26:00 | Earth | 0.0526 AU | 20.5 LD | 9.1 km/s |
| 2086-10-14 22:39:00 | Earth | 0.4069 AU | 158.4 LD | 16.5 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