SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 BD77

2012 BD77

2012 BD77 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.626 AU once every 2.07 yr.

Amor Observations: 31
Orbital Period · P
2.07 yr
v(q)
30 km/s
v(Q)
18.2 km/s
Diameter · ≈
0.19 km
TJ
4.11
Eccentricity · e
0.245

Orbit and dynamics

The path is an ellipse reaching 1.227 AU from the Sun at perihelion and 2.024 AU at aphelion, a radial span of 0.797 AU.

Applying Kepler's third law to a = 1.626 AU gives an orbital period of 2.07 yr, or about 757 days.

An eccentricity of 0.245 makes the orbit moderately elongated.

A steep inclination of 32.69° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 30 km/s at perihelion and falls to 18.2 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 21.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.19 km.

Observation record and orbit quality

The current orbit solution is based on 31 observations and has a weighted RMS residual of 0.5132 arcseconds.

Condition code U = 6 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
1.626 AU
Eccentricity
0.245
Perihelion
1.227 AU
Aphelion
2.02437 AU
Inclination
32.69°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
292.27°

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-10 02:32 0.383781 AU
57412892 km
17.86 km/s
2041-Feb-03 02:57 0.401860 AU
60117464 km
16.42 km/s
2068-Feb-09 04:06 0.378182 AU
56575262 km
17.25 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
21.4

Orbit Quality

RMS
0.51323
Condition
6
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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