SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 HF2

2008 HF2

2008 HF2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.698 AU it takes 2.21 yr to circle the Sun.

Apollo Observations: 129
Orbital Period · P
2.21 yr
v(q)
59.9 km/s
v(Q)
8.7 km/s
Diameter · ≈
0.43 km
TJ
3.8
Eccentricity · e
0.7457

Orbit and dynamics

The path is an ellipse reaching 0.432 AU from the Sun at perihelion and 2.964 AU at aphelion, a radial span of 2.532 AU.

Applying Kepler's third law to a = 1.698 AU gives an orbital period of 2.21 yr, or about 808 days.

The high eccentricity (0.746) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 14.59° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 59.9 km/s at perihelion and falls to 8.7 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 = 19.56 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.43 km.

Observation record and orbit quality

The current orbit solution is based on 129 observations and has a weighted RMS residual of 0.5264 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
1.698 AU
Eccentricity
0.7457
Perihelion
0.432 AU
Aphelion
2.964199 AU
Inclination
14.59°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
25.48°

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
2028-May-15 16:31 0.387949 AU
58036330 km
35.42 km/s
2033-Jan-11 09:06 0.251176 AU
37575330 km
26.61 km/s
2039-May-31 23:45 0.177320 AU
26526733 km
25.36 km/s
2044-Jan-30 06:15 0.478133 AU
71527682 km
37.54 km/s
2050-Jun-18 06:24 0.393715 AU
58898976 km
14.97 km/s
2052-Nov-13 06:06 0.481175 AU
71982822 km
23.99 km/s
2063-Dec-29 04:45 0.294597 AU
44071047 km
20.15 km/s
2070-May-22 20:27 0.279555 AU
41820891 km
31.34 km/s
2075-Jan-19 23:11 0.321966 AU
48165406 km
31.13 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
19.56

Orbit Quality

RMS
0.52639
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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