SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 BZ

2021 BZ

2021 BZ is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.995 AU and a period of 0.99 yr.

Aten Observations: 62
Orbital Period · P
0.99 yr
v(q)
40.9 km/s
v(Q)
21.8 km/s
Diameter · ≈
0.04 km
TJ
6.02
Eccentricity · e
0.3044

Orbit and dynamics

Between its closest point (0.692 AU) and its farthest (1.297 AU), the heliocentric distance changes by 0.605 AU over every revolution.

One full revolution takes 0.99 yr (362 days), computed from the semi-major axis of 0.995 AU.

An eccentricity of 0.304 makes the orbit moderately elongated.

The orbital plane is tilted 19.29° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 40.9 km/s at perihelion and falls to 21.8 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 = 24.76 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 62 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3563 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
0.9945 AU
Eccentricity
0.3044
Perihelion
0.692 AU
Aphelion
1.297226 AU
Inclination
19.29°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
71.73°

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-Jan-19 10:23 0.282851 AU
42313895 km
20.72 km/s
2028-Jan-17 17:23 0.333025 AU
49819895 km
22.15 km/s
2029-Jan-14 23:49 0.382945 AU
57287820 km
23.58 km/s
2030-Jan-13 04:30 0.432932 AU
64765737 km
25.02 km/s
2031-Jan-11 07:14 0.483840 AU
72381360 km
26.53 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
24.76

Orbit Quality

RMS
0.35633
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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