SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 HM82

2009 HM82

2009 HM82 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.273 AU it takes 1.44 yr to circle the Sun.

Apollo Observations: 90
Orbital Period · P
1.44 yr
v(q)
36.1 km/s
v(Q)
19.3 km/s
Diameter · ≈
0.1 km
TJ
4.97
Eccentricity · e
0.3026

Orbit and dynamics

The path is an ellipse reaching 0.888 AU from the Sun at perihelion and 1.658 AU at aphelion, a radial span of 0.77 AU.

Applying Kepler's third law to a = 1.273 AU gives an orbital period of 1.44 yr, or about 525 days.

An eccentricity of 0.303 makes the orbit moderately elongated.

A steep inclination of 20.4° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 36.1 km/s at perihelion and falls to 19.3 km/s at aphelion.

Because q < 1 AU and Q > 1 AU, this orbit geometrically intersects the region of Earth's orbit.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 22.75 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.1 km.

Observation record and orbit quality

The current orbit solution is based on 90 observations and has a weighted RMS residual of 0.6416 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
1.273 AU
Eccentricity
0.3026
Perihelion
0.888 AU
Aphelion
1.65821 AU
Inclination
20.4°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
283.7°

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
2029-Oct-16 07:35 0.211068 AU
31575272 km
16.04 km/s
2032-Apr-29 14:03 0.175359 AU
26233402 km
16.79 km/s
2039-Oct-26 05:45 0.481946 AU
72098049 km
23.96 km/s
2042-May-09 14:11 0.174599 AU
26119585 km
11.17 km/s
2042-Oct-25 10:33 0.338906 AU
50699638 km
10.95 km/s
2052-Apr-17 23:46 0.474219 AU
70942205 km
10.28 km/s
2052-Oct-14 10:37 0.158675 AU
23737408 km
13.29 km/s
2055-Apr-25 02:07 0.309311 AU
46272277 km
20.13 km/s
2062-Oct-21 18:08 0.362108 AU
54170563 km
20.54 km/s
2065-May-06 10:06 0.077165 AU
11543715 km
12.94 km/s
2065-Nov-02 22:17 0.427119 AU
63896156 km
11.12 km/s
2075-May-02 18:08 0.375717 AU
56206513 km
10.30 km/s
2075-Oct-16 05:41 0.193908 AU
29008244 km
11.78 km/s
2078-Apr-20 08:37 0.420440 AU
62896889 km
23.02 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
22.75

Orbit Quality

RMS
0.64159
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.

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