SpaceAtlas Space Object Data
NASA JPL SBDB · 2014 HM187

2014 HM187

2014 HM187 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.523 AU once every 1.88 yr.

Amor Observations: 52
Orbital Period · P
1.88 yr
v(q)
29.2 km/s
v(Q)
19.9 km/s
Diameter · ≈
0.19 km
TJ
4.48
Eccentricity · e
0.1896

Orbit and dynamics

The path is an ellipse reaching 1.234 AU from the Sun at perihelion and 1.812 AU at aphelion, a radial span of 0.578 AU.

Applying Kepler's third law to a = 1.523 AU gives an orbital period of 1.88 yr, or about 686 days.

An eccentricity of 0.19 makes the orbit moderately elongated.

Its inclination of 0.66° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 29.2 km/s at perihelion and falls to 19.9 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 21.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.19 km.

Observation record and orbit quality

The current orbit solution is based on 52 observations and has a weighted RMS residual of 0.4512 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

About these computed values

Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

Orbital Parameters

Semi-Major Axis
1.523 AU
Eccentricity
0.1896
Perihelion
1.234 AU
Aphelion
1.811761 AU
Inclination
0.66°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
28.75°

Orbit diagram

The Sun sits at the focus (orange). Earth's orbit is the grey circle at 1 AU. The red dot marks the object's position at the catalog epoch.

3D orbit (interactive)

Drag to rotate; scroll or pinch to zoom. The Sun is at the focus (orange), Earth's orbit is the grey ring at 1 AU, and the red dot marks the object's current position.

Close approaches

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2033-Jul-23 07:20 0.367218 AU
54934973 km
2.73 km/s
2035-Oct-27 06:37 0.304589 AU
45565793 km
1.77 km/s
2048-Jul-21 17:56 0.372509 AU
55726480 km
2.82 km/s
2050-Oct-27 07:13 0.304664 AU
45577076 km
1.75 km/s
2063-Jul-27 07:43 0.354224 AU
52991163 km
2.50 km/s
2065-Nov-01 20:15 0.322636 AU
48265644 km
2.15 km/s
2078-Aug-03 01:08 0.329964 AU
49361953 km
2.04 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
21.4

Orbit Quality

RMS
0.45122
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database · NASA CNEOS. Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

Keep exploring

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