SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 AC45

2015 AC45

2015 AC45 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.329 AU once every 1.53 yr.

Amor Observations: 145
Orbital Period · P
1.53 yr
v(q)
31.3 km/s
v(Q)
21.4 km/s
Diameter · ≈
0.18 km
TJ
4.87
Eccentricity · e
0.1881

Orbit and dynamics

The path is an ellipse reaching 1.079 AU from the Sun at perihelion and 1.579 AU at aphelion, a radial span of 0.5 AU.

Applying Kepler's third law to a = 1.329 AU gives an orbital period of 1.53 yr, or about 560 days.

An eccentricity of 0.188 makes the orbit moderately elongated.

The orbital plane is tilted 15.75° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31.3 km/s at perihelion and falls to 21.4 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 = 21.48 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.18 km.

Observation record and orbit quality

The current orbit solution is based on 145 observations and has a weighted RMS residual of 0.4515 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
1.329 AU
Eccentricity
0.1881
Perihelion
1.079 AU
Aphelion
1.578985 AU
Inclination
15.75°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
107.07°

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
2035-Jul-11 02:03 0.355394 AU
53166204 km
8.60 km/s
2038-Feb-10 17:58 0.249970 AU
37394950 km
10.12 km/s
2038-Jun-12 15:12 0.249721 AU
37357779 km
8.30 km/s
2041-Jan-19 19:47 0.272262 AU
40729820 km
8.46 km/s
2041-May-23 14:32 0.429052 AU
64185310 km
12.43 km/s
2043-Dec-19 20:41 0.471570 AU
70545822 km
8.71 km/s
2058-Jul-25 01:39 0.437088 AU
65387434 km
8.92 km/s
2061-Feb-15 04:45 0.384520 AU
57523373 km
13.16 km/s
2061-Jun-26 07:17 0.279504 AU
41813151 km
8.24 km/s
2064-Feb-02 12:43 0.205103 AU
30682926 km
8.63 km/s
2064-May-31 10:51 0.304378 AU
45534303 km
9.57 km/s
2067-Jan-04 23:16 0.375589 AU
56187258 km
8.66 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
21.48

Orbit Quality

RMS
0.4515
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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