SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 BZ2

2021 BZ2

2021 BZ2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.038 AU it takes 1.06 yr to circle the Sun.

Apollo Observations: 51
Orbital Period · P
1.06 yr
v(q)
33.5 km/s
v(Q)
25.5 km/s
Diameter · ≈
0.06 km
TJ
5.87
Eccentricity · e
0.1344

Orbit and dynamics

Between its closest point (0.898 AU) and its farthest (1.178 AU), the heliocentric distance changes by 0.28 AU over every revolution.

One full revolution takes 1.06 yr (386 days), computed from the semi-major axis of 1.038 AU.

An eccentricity of 0.134 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 33.5 km/s at perihelion and falls to 25.5 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 = 23.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

Astrometry from 51 individual observations underpins this orbit; the fit leaves an RMS residual of 0.2693 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
1.038 AU
Eccentricity
0.1344
Perihelion
0.898 AU
Aphelion
1.177507 AU
Inclination
13.99°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
266.77°

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
2039-Feb-23 02:15 0.187533 AU
28054580 km
10.86 km/s
2040-Jan-29 10:02 0.159901 AU
23920845 km
7.81 km/s
2040-Jul-09 14:54 0.166999 AU
24982704 km
8.06 km/s
2040-Nov-30 00:18 0.300122 AU
44897572 km
5.90 km/s
2041-Aug-28 04:01 0.149058 AU
22298814 km
10.84 km/s
2042-Sep-21 09:17 0.472890 AU
70743388 km
19.53 km/s
2057-Feb-22 00:18 0.358859 AU
53684594 km
16.01 km/s
2058-Feb-17 06:54 0.117011 AU
17504656 km
8.62 km/s
2059-Jan-11 02:06 0.224399 AU
33569641 km
7.77 km/s
2059-Aug-04 17:33 0.076735 AU
11479402 km
8.20 km/s
2060-Sep-08 00:57 0.267046 AU
39949471 km
14.00 km/s
2076-Feb-23 22:50 0.247487 AU
37023571 km
13.11 km/s
2077-Feb-08 05:26 0.120202 AU
17981961 km
7.92 km/s
2077-Dec-24 11:57 0.264589 AU
39581977 km
7.31 km/s
2078-Aug-18 09:11 0.074007 AU
11071258 km
9.15 km/s
2079-Sep-15 21:45 0.355254 AU
53145216 km
16.79 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
23.8

Orbit Quality

RMS
0.26926
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.