SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 HM11

2013 HM11

2013 HM11 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.895 AU and a period of 0.85 yr.

Aten Observations: 64
Orbital Period · P
0.85 yr
v(q)
46.4 km/s
v(Q)
21.4 km/s
Diameter · ≈
0.08 km
TJ
6.49
Eccentricity · e
0.3699

Orbit and dynamics

Between its closest point (0.564 AU) and its farthest (1.226 AU), the heliocentric distance changes by 0.662 AU over every revolution.

One full revolution takes 0.85 yr (309 days), computed from the semi-major axis of 0.895 AU.

An eccentricity of 0.37 makes the orbit moderately elongated.

A steep inclination of 29° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 46.4 km/s at perihelion and falls to 21.4 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 = 23.21 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

Astrometry from 64 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5451 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
0.8949 AU
Eccentricity
0.3699
Perihelion
0.564 AU
Aphelion
1.225924 AU
Inclination
29.0°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
54.67°

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-Dec-01 10:29 0.405696 AU
60691187 km
21.51 km/s
2029-Apr-01 20:41 0.384387 AU
57503418 km
14.99 km/s
2030-Apr-28 16:23 0.309373 AU
46281605 km
22.18 km/s
2034-Oct-20 02:45 0.423036 AU
63285266 km
24.05 km/s
2035-Apr-26 10:08 0.164835 AU
24658897 km
15.25 km/s
2039-Dec-04 20:27 0.409167 AU
61210484 km
21.30 km/s
2040-Mar-30 20:03 0.394786 AU
59059112 km
14.99 km/s
2041-Apr-28 23:07 0.289007 AU
43234845 km
21.60 km/s
2045-Oct-22 05:58 0.418640 AU
62627635 km
23.98 km/s
2046-Apr-25 07:06 0.176799 AU
26448760 km
15.15 km/s
2050-Dec-07 06:17 0.413017 AU
61786410 km
21.09 km/s
2051-Mar-29 18:06 0.404817 AU
60559788 km
14.99 km/s
2052-Apr-29 04:08 0.269082 AU
40254096 km
21.03 km/s
2056-Oct-24 08:17 0.414629 AU
62027616 km
23.90 km/s
2057-Apr-24 02:41 0.189173 AU
28299941 km
15.07 km/s
2061-Dec-09 17:32 0.417372 AU
62437891 km
20.88 km/s
2062-Mar-27 15:28 0.414390 AU
61991889 km
14.99 km/s
2063-Apr-30 07:56 0.250040 AU
37405384 km
20.49 km/s
2067-Oct-27 11:58 0.410910 AU
61471194 km
23.81 km/s
2068-Apr-22 20:26 0.202047 AU
30225784 km
15.01 km/s
2072-Dec-12 10:34 0.422541 AU
63211179 km
20.65 km/s
2073-Mar-25 07:50 0.424210 AU
63460877 km
14.98 km/s
2074-Apr-30 10:59 0.230553 AU
34490236 km
19.93 km/s
2078-Oct-29 21:29 0.407248 AU
60923424 km
23.69 km/s
2079-Apr-22 09:48 0.216729 AU
32422189 km
14.96 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
23.21

Orbit Quality

RMS
0.54507
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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