SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 BL45

2011 BL45

2011 BL45 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: 24
Orbital Period · P
1.06 yr
v(q)
29.9 km/s
v(Q)
28.6 km/s
Diameter · ≈
0.01 km
TJ
5.91
Eccentricity · e
0.021

Orbit and dynamics

Between its closest point (1.016 AU) and its farthest (1.06 AU), the heliocentric distance changes by 0.044 AU over every revolution.

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

With e = 0.021, the orbit is close to circular.

Its inclination of 3.05° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 29.9 km/s at perihelion and falls to 28.6 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 27.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 24 individual observations underpins this orbit; the fit leaves an RMS residual of 0.9033 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
1.038 AU
Eccentricity
0.021
Perihelion
1.016 AU
Aphelion
1.059798 AU
Inclination
3.05°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
30.58°

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
2028-May-15 19:15 0.396199 AU
59270582 km
12.59 km/s
2030-Aug-26 03:04 0.236855 AU
35432980 km
7.93 km/s
2048-May-16 15:24 0.261468 AU
39115010 km
11.49 km/s
2050-Aug-25 12:08 0.171725 AU
25689754 km
7.20 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
27.1

Orbit Quality

RMS
0.9033
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.

Keep exploring

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