SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 AP7

2021 AP7

2021 AP7 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.286 AU it takes 1.46 yr to circle the Sun.

Apollo Observations: 50
Orbital Period · P
1.46 yr
v(q)
37.8 km/s
v(Q)
18.2 km/s
Diameter · ≈
0.15 km
TJ
4.97
Eccentricity · e
0.3504

Orbit and dynamics

Between its closest point (0.836 AU) and its farthest (1.737 AU), the heliocentric distance changes by 0.901 AU over every revolution.

One full revolution takes 1.46 yr (533 days), computed from the semi-major axis of 1.286 AU.

An eccentricity of 0.35 makes the orbit moderately elongated.

The orbital plane is tilted 7.4° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.8 km/s at perihelion and falls to 18.2 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 = 21.83 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.15 km.

Observation record and orbit quality

Astrometry from 50 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5559 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
1.286 AU
Eccentricity
0.3504
Perihelion
0.836 AU
Aphelion
1.736614 AU
Inclination
7.4°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
323.22°

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-Dec-07 01:16 0.126778 AU
18965648 km
9.58 km/s
2039-Aug-13 15:19 0.111302 AU
16650483 km
8.42 km/s
2040-Jan-24 14:38 0.464842 AU
69539302 km
8.32 km/s
2042-Jun-29 12:58 0.395959 AU
59234585 km
20.78 km/s
2052-Dec-28 20:56 0.391874 AU
58623484 km
20.66 km/s
2055-Jun-08 23:00 0.471401 AU
70520626 km
6.77 km/s
2055-Nov-06 19:17 0.161877 AU
24216507 km
7.86 km/s
2058-Jul-24 03:48 0.085880 AU
12847481 km
10.52 km/s
2071-Dec-22 10:00 0.255583 AU
38234627 km
16.14 km/s
2074-Oct-01 06:02 0.175142 AU
26200901 km
8.99 km/s
2074-Dec-28 20:15 0.330138 AU
49387957 km
4.94 km/s
2077-Jul-11 17:10 0.195790 AU
29289797 km
14.74 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
21.83

Orbit Quality

RMS
0.55591
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.

Keep exploring

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