SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 HC36

2011 HC36

2011 HC36 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.64 AU it takes 2.10 yr to circle the Sun.

Apollo Observations: 212
Orbital Period · P
2.10 yr
v(q)
35.9 km/s
v(Q)
15.1 km/s
Diameter · ≈
0.26 km
TJ
4.16
Eccentricity · e
0.4078

Orbit and dynamics

Between its closest point (0.971 AU) and its farthest (2.309 AU), the heliocentric distance changes by 1.338 AU over every revolution.

One full revolution takes 2.10 yr (767 days), computed from the semi-major axis of 1.64 AU.

The high eccentricity (0.408) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 15.48° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.9 km/s at perihelion and falls to 15.1 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 = 20.69 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.26 km.

Observation record and orbit quality

Astrometry from 212 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4013 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
1.64 AU
Eccentricity
0.4078
Perihelion
0.971 AU
Aphelion
2.308792 AU
Inclination
15.48°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
13.58°

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
2030-Jun-09 06:29 0.362307 AU
54200362 km
15.65 km/s
2032-May-24 19:09 0.482063 AU
72115643 km
7.60 km/s
2032-Oct-07 12:19 0.148570 AU
22225728 km
14.44 km/s
2051-Jun-16 12:31 0.300880 AU
45011065 km
12.28 km/s
2053-Oct-13 15:20 0.259776 AU
38861957 km
17.46 km/s
2072-Jul-08 23:23 0.276848 AU
41415937 km
8.20 km/s
2074-Oct-19 16:15 0.377821 AU
56521245 km
20.66 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
20.69

Orbit Quality

RMS
0.40135
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.

Keep exploring

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