SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 ON24

2011 ON24

2011 ON24 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.243 AU once every 1.39 yr.

Amor Observations: 26
Orbital Period · P
1.39 yr
v(q)
31.9 km/s
v(Q)
22.4 km/s
Diameter · ≈
0.09 km
TJ
5.12
Eccentricity · e
0.1752

Orbit and dynamics

The path is an ellipse reaching 1.026 AU from the Sun at perihelion and 1.461 AU at aphelion, a radial span of 0.435 AU.

Applying Kepler's third law to a = 1.243 AU gives an orbital period of 1.39 yr, or about 506 days.

An eccentricity of 0.175 makes the orbit moderately elongated.

The orbital plane is tilted 13.99° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31.9 km/s at perihelion and falls to 22.4 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 = 23 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

The current orbit solution is based on 26 observations and has a weighted RMS residual of 0.3658 arcseconds.

Condition code U = 1 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
1.243 AU
Eccentricity
0.1752
Perihelion
1.026 AU
Aphelion
1.460774 AU
Inclination
13.99°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
184.96°

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
2029-Aug-01 06:53 0.246006 AU
36801989 km
7.48 km/s
2029-Dec-28 07:38 0.312132 AU
46694312 km
12.63 km/s
2036-Aug-26 16:38 0.246150 AU
36823590 km
9.99 km/s
2037-Jan-11 13:26 0.184995 AU
27674878 km
7.57 km/s
2040-Jun-05 10:26 0.488190 AU
73032181 km
7.67 km/s
2044-Feb-24 06:12 0.411840 AU
61610320 km
7.63 km/s
2047-Jul-17 03:13 0.327798 AU
49037811 km
7.71 km/s
2047-Dec-31 00:37 0.462222 AU
69147434 km
16.70 km/s
2054-Aug-21 06:55 0.181695 AU
27181156 km
8.01 km/s
2055-Jan-02 06:31 0.154381 AU
23095001 km
8.36 km/s
2061-Aug-25 23:03 0.453983 AU
67914948 km
15.75 km/s
2062-Feb-06 11:13 0.332872 AU
49796903 km
7.69 km/s
2065-Jul-01 04:56 0.399894 AU
59823338 km
7.83 km/s
2072-Aug-09 06:51 0.206379 AU
30873829 km
7.43 km/s
2072-Dec-28 16:12 0.237722 AU
35562647 km
10.73 km/s
2079-Aug-28 17:51 0.310707 AU
46481111 km
11.73 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
23.0

Orbit Quality

RMS
0.36583
Condition
1
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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