SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 HC1

2015 HC1

2015 HC1 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.355 AU once every 1.58 yr.

Amor Observations: 35
Orbital Period · P
1.58 yr
v(q)
31.9 km/s
v(Q)
20.5 km/s
Diameter · ≈
0.01 km
TJ
4.84
Eccentricity · e
0.2168

Orbit and dynamics

Between its closest point (1.061 AU) and its farthest (1.649 AU), the heliocentric distance changes by 0.588 AU over every revolution.

One full revolution takes 1.58 yr (576 days), computed from the semi-major axis of 1.355 AU.

An eccentricity of 0.217 makes the orbit moderately elongated.

Its inclination of 1.98° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 31.9 km/s at perihelion and falls to 20.5 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 = 27.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 35 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4839 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
1.355 AU
Eccentricity
0.2168
Perihelion
1.061 AU
Aphelion
1.648764 AU
Inclination
1.98°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
22.35°

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
2075-Aug-24 00:13 0.464565 AU
69497861 km
6.48 km/s
2078-Feb-19 08:41 0.256218 AU
38329705 km
2.12 km/s
2078-May-26 09:56 0.238227 AU
35638211 km
9.40 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
27.1

Orbit Quality

RMS
0.48393
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.

Keep exploring

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