SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 DA2

2021 DA2

2021 DA2 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.898 AU and a period of 0.85 yr.

Aten Observations: 74
Orbital Period · P
0.85 yr
v(q)
38.9 km/s
v(Q)
25.4 km/s
Diameter · ≈
0.01 km
TJ
6.6
Eccentricity · e
0.21

Orbit and dynamics

Between its closest point (0.71 AU) and its farthest (1.087 AU), the heliocentric distance changes by 0.377 AU over every revolution.

One full revolution takes 0.85 yr (311 days), computed from the semi-major axis of 0.898 AU.

An eccentricity of 0.21 makes the orbit moderately elongated.

The orbital plane is tilted 8.58° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.9 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 = 29.17 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 74 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4497 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
0.8983 AU
Eccentricity
0.21
Perihelion
0.71 AU
Aphelion
1.086943 AU
Inclination
8.58°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
186.54°

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
2026-Dec-17 05:05 0.250811 AU
37520769 km
5.40 km/s
2027-Apr-22 22:16 0.157288 AU
23530002 km
5.11 km/s
2027-Jun-30 21:37 0.167302 AU
25028068 km
5.21 km/s
2032-Mar-04 01:20 0.436141 AU
65245776 km
19.55 km/s
2032-Nov-02 22:09 0.300250 AU
44916699 km
8.91 km/s
2033-Jun-03 19:53 0.179659 AU
26876541 km
9.12 km/s
2038-Feb-27 03:53 0.281983 AU
42184004 km
15.45 km/s
2038-Oct-12 13:32 0.300908 AU
45015252 km
9.73 km/s
2039-May-28 20:54 0.264860 AU
39622513 km
13.18 km/s
2044-Feb-22 21:47 0.128846 AU
19275102 km
11.40 km/s
2044-Sep-21 09:38 0.282980 AU
42333151 km
9.65 km/s
2045-May-22 15:14 0.366377 AU
54809180 km
17.11 km/s
2050-Feb-21 06:52 0.000746 AU
111635 km
7.40 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
29.17

Orbit Quality

RMS
0.44971
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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