SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 AV4

2021 AV4

2021 AV4 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.91 AU and a period of 0.87 yr.

Aten Observations: 29
Orbital Period · P
0.87 yr
v(q)
38.4 km/s
v(Q)
25.4 km/s
Diameter · ≈
0.23 km
TJ
6.51
Eccentricity · e
0.2031

Orbit and dynamics

Between its closest point (0.725 AU) and its farthest (1.095 AU), the heliocentric distance changes by 0.37 AU over every revolution.

One full revolution takes 0.87 yr (317 days), computed from the semi-major axis of 0.91 AU.

An eccentricity of 0.203 makes the orbit moderately elongated.

The orbital plane is tilted 13.3° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.4 km/s at perihelion and falls to 25.4 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 = 20.94 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.23 km.

Observation record and orbit quality

Astrometry from 29 individual observations underpins this orbit; the fit leaves an RMS residual of 0.503 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
0.9103 AU
Eccentricity
0.2031
Perihelion
0.725 AU
Aphelion
1.095182 AU
Inclination
13.3°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
351.16°

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
2027-Jul-15 00:31 0.122305 AU
18296615 km
7.80 km/s
2028-Jan-30 22:55 0.237906 AU
35590207 km
8.34 km/s
2033-Aug-16 00:27 0.390542 AU
58424320 km
18.43 km/s
2034-May-06 17:13 0.315370 AU
47178611 km
8.16 km/s
2034-Dec-13 13:00 0.127447 AU
19065757 km
10.58 km/s
2040-Jul-28 01:23 0.106687 AU
15960195 km
10.09 km/s
2041-Mar-01 22:47 0.307672 AU
46027145 km
8.68 km/s
2041-Nov-22 04:49 0.417577 AU
62468661 km
19.33 km/s
2047-Jun-06 21:38 0.254874 AU
38128577 km
7.73 km/s
2047-Dec-27 14:22 0.118710 AU
17758745 km
8.43 km/s
2053-Aug-06 00:07 0.212321 AU
31762754 km
13.28 km/s
2054-Mar-29 00:27 0.335779 AU
50231759 km
8.61 km/s
2054-Nov-30 08:12 0.286842 AU
42911023 km
15.44 km/s
2060-Jul-05 20:23 0.161865 AU
24214687 km
7.49 km/s
2061-Jan-18 10:47 0.202219 AU
30251482 km
8.12 km/s
2066-Aug-13 06:33 0.331455 AU
49585000 km
16.70 km/s
2067-Apr-23 19:45 0.330202 AU
49397469 km
8.33 km/s
2067-Dec-08 20:11 0.173797 AU
25999686 km
12.10 km/s
2073-Jul-22 01:27 0.091958 AU
13756712 km
8.66 km/s
2074-Feb-13 17:13 0.274580 AU
41076512 km
8.56 km/s
2074-Nov-18 02:57 0.495771 AU
74166346 km
21.68 km/s
2079-Aug-19 12:56 0.444470 AU
66491777 km
20.01 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
20.94

Orbit Quality

RMS
0.50305
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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