SpaceAtlas Space Object Data
NASA JPL SBDB · 2007 HD15

2007 HD15

2007 HD15 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.282 AU it takes 1.45 yr to circle the Sun.

Apollo Observations: 49
Orbital Period · P
1.45 yr
v(q)
34.9 km/s
v(Q)
19.8 km/s
Diameter · ≈
0.05 km
TJ
4.98
Eccentricity · e
0.2761

Orbit and dynamics

Between its closest point (0.928 AU) and its farthest (1.636 AU), the heliocentric distance changes by 0.708 AU over every revolution.

One full revolution takes 1.45 yr (530 days), computed from the semi-major axis of 1.282 AU.

An eccentricity of 0.276 makes the orbit moderately elongated.

The orbital plane is tilted 15.06° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.9 km/s at perihelion and falls to 19.8 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 = 24.16 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 49 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5626 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.282 AU
Eccentricity
0.2761
Perihelion
0.928 AU
Aphelion
1.63596 AU
Inclination
15.06°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
99.27°

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
2036-Apr-25 11:04 0.018635 AU
2787692 km
13.26 km/s
2038-Dec-15 14:39 0.255600 AU
38237176 km
12.49 km/s
2054-Dec-06 13:38 0.443953 AU
66414486 km
19.23 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
24.16

Orbit Quality

RMS
0.56258
Condition
7
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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