SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 HM

2019 HM

2019 HM is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.986 AU and a period of 0.98 yr.

Aten Observations: 35
Orbital Period · P
0.98 yr
v(q)
30.3 km/s
v(Q)
29.7 km/s
Diameter · ≈
0.02 km
TJ
6.15
Eccentricity · e
0.0098

Orbit and dynamics

Between its closest point (0.976 AU) and its farthest (0.995 AU), the heliocentric distance changes by 0.019 AU over every revolution.

One full revolution takes 0.98 yr (357 days), computed from the semi-major axis of 0.986 AU.

With e = 0.01, the orbit is close to circular.

The orbital plane is tilted 5.76° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 30.3 km/s at perihelion and falls to 29.7 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 25.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 35 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4718 arcseconds.

Condition code U = 1 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
0.9856 AU
Eccentricity
0.0098
Perihelion
0.976 AU
Aphelion
0.995259 AU
Inclination
5.76°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
270.06°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
25.9

Orbit Quality

RMS
0.47184
Condition
1
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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