SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 OB57

2011 OB57

2011 OB57 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.951 AU and a period of 0.93 yr.

Aten Observations: 12
Orbital Period · P
0.93 yr
v(q)
39.1 km/s
v(Q)
23.9 km/s
Diameter · ≈
0.02 km
TJ
6.3
Eccentricity · e
0.2422

Orbit and dynamics

Between its closest point (0.72 AU) and its farthest (1.181 AU), the heliocentric distance changes by 0.461 AU over every revolution.

One full revolution takes 0.93 yr (339 days), computed from the semi-major axis of 0.951 AU.

An eccentricity of 0.242 makes the orbit moderately elongated.

Its inclination of 4.91° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39.1 km/s at perihelion and falls to 23.9 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 = 26 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 12 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3841 arcseconds.

Condition code U = 5 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
0.9507 AU
Eccentricity
0.2422
Perihelion
0.72 AU
Aphelion
1.18096 AU
Inclination
4.91°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
134.16°

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
2036-Jul-05 10:34 0.115572 AU
17289395 km
10.93 km/s
2037-Apr-16 19:46 0.244632 AU
36596476 km
7.24 km/s
2037-Aug-29 00:26 0.180244 AU
26964185 km
5.88 km/s
2038-Jan-30 22:45 0.246110 AU
36817512 km
8.45 km/s
2038-Nov-09 11:06 0.108297 AU
16200972 km
9.75 km/s
2048-Jul-20 03:14 0.478647 AU
71604505 km
21.87 km/s
2049-Jul-03 21:21 0.054201 AU
8108321 km
9.07 km/s
2050-Apr-05 18:43 0.259813 AU
38867458 km
8.09 km/s
2050-Sep-09 17:42 0.186774 AU
27940968 km
5.88 km/s
2051-Jan-21 20:00 0.231097 AU
34571674 km
7.86 km/s
2051-Nov-08 01:07 0.150731 AU
22549065 km
11.20 km/s
2062-Jul-04 10:32 0.074178 AU
11096805 km
9.37 km/s
2063-Apr-08 16:37 0.259596 AU
38835033 km
7.91 km/s
2063-Sep-07 02:57 0.187271 AU
28015347 km
5.89 km/s
2064-Jan-25 04:52 0.234663 AU
35105029 km
8.04 km/s
2064-Nov-08 07:57 0.132369 AU
19802058 km
10.66 km/s
2075-Jul-05 19:13 0.093235 AU
13947720 km
10.38 km/s
2076-Apr-14 18:47 0.247614 AU
37042533 km
7.42 km/s
2076-Aug-30 18:55 0.184010 AU
27527467 km
5.91 km/s
2077-Jan-30 10:24 0.240420 AU
35966383 km
8.39 km/s
2077-Nov-09 22:37 0.100834 AU
15084592 km
9.75 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
26.0

Orbit Quality

RMS
0.38414
Condition
5
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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