SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 HL31

2012 HL31

2012 HL31 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.888 AU and a period of 0.84 yr.

Aten Observations: 92
Orbital Period · P
0.84 yr
v(q)
46.8 km/s
v(Q)
21.3 km/s
Diameter · ≈
0.12 km
TJ
6.58
Eccentricity · e
0.374

Orbit and dynamics

Between its closest point (0.556 AU) and its farthest (1.22 AU), the heliocentric distance changes by 0.664 AU over every revolution.

One full revolution takes 0.84 yr (305 days), computed from the semi-major axis of 0.888 AU.

An eccentricity of 0.374 makes the orbit moderately elongated.

The orbital plane is tilted 19.81° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 46.8 km/s at perihelion and falls to 21.3 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 = 22.43 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

Astrometry from 92 individual observations underpins this orbit; the fit leaves an RMS residual of 0.518 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
0.8876 AU
Eccentricity
0.374
Perihelion
0.556 AU
Aphelion
1.219562 AU
Inclination
19.81°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
102.18°

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
2027-Apr-08 02:49 0.185102 AU
27690869 km
14.87 km/s
2027-Nov-12 03:49 0.436241 AU
65260733 km
20.91 km/s
2028-Jun-20 12:04 0.325956 AU
48762382 km
13.62 km/s
2032-Apr-07 15:01 0.254994 AU
38146597 km
17.39 km/s
2032-Nov-22 08:39 0.442369 AU
66177452 km
20.64 km/s
2033-Jun-12 19:12 0.299100 AU
44744679 km
12.03 km/s
2037-Apr-10 01:27 0.342790 AU
51280658 km
20.35 km/s
2037-Dec-04 00:40 0.447463 AU
66939541 km
19.85 km/s
2038-Jun-01 19:09 0.281497 AU
42111283 km
11.71 km/s
2042-Apr-13 12:10 0.437556 AU
65457518 km
23.48 km/s
2042-Dec-16 06:46 0.449735 AU
67279435 km
18.44 km/s
2043-May-22 06:00 0.263639 AU
39439782 km
11.72 km/s
2043-Aug-30 15:36 0.390993 AU
58491669 km
13.05 km/s
2047-Dec-29 19:07 0.446822 AU
66843561 km
16.19 km/s
2048-May-11 13:11 0.240765 AU
36017958 km
11.78 km/s
2048-Sep-14 20:34 0.402215 AU
60170552 km
15.81 km/s
2053-Jan-13 20:19 0.434369 AU
64980747 km
12.58 km/s
2053-May-02 12:35 0.212704 AU
31820116 km
11.77 km/s
2053-Sep-28 04:47 0.410117 AU
61352650 km
17.75 km/s
2058-Apr-24 00:10 0.180169 AU
26952890 km
11.83 km/s
2058-Oct-10 10:11 0.417005 AU
62382995 km
19.16 km/s
2063-Apr-16 13:35 0.152134 AU
22758978 km
12.11 km/s
2063-Oct-21 18:54 0.423386 AU
63337570 km
20.13 km/s
2064-Jun-20 06:52 0.434590 AU
65013774 km
19.36 km/s
2068-Apr-10 02:27 0.147401 AU
22050804 km
13.06 km/s
2068-Oct-31 22:03 0.429863 AU
64306611 km
20.72 km/s
2069-Jun-22 12:03 0.371819 AU
55623291 km
16.31 km/s
2073-Apr-07 19:11 0.183960 AU
27519958 km
14.85 km/s
2073-Nov-11 20:13 0.436318 AU
65272279 km
20.90 km/s
2074-Jun-21 07:58 0.326492 AU
48842494 km
13.61 km/s
2078-Apr-08 08:02 0.255455 AU
38215553 km
17.43 km/s
2078-Nov-23 05:16 0.442651 AU
66219645 km
20.64 km/s
2079-Jun-13 09:54 0.299502 AU
44804910 km
12.01 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
22.43

Orbit Quality

RMS
0.51803
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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