SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 MB54

2015 MB54

2015 MB54 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.311 AU it takes 1.50 yr to circle the Sun.

Apollo Observations: 134
Orbital Period · P
1.50 yr
v(q)
33.3 km/s
v(Q)
20.3 km/s
Diameter · ≈
0.06 km
TJ
4.94
Eccentricity · e
0.2409

Orbit and dynamics

The path is an ellipse reaching 0.995 AU from the Sun at perihelion and 1.627 AU at aphelion, a radial span of 0.632 AU.

Applying Kepler's third law to a = 1.311 AU gives an orbital period of 1.50 yr, or about 548 days.

An eccentricity of 0.241 makes the orbit moderately elongated.

Its inclination of 2.7° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.3 km/s at perihelion and falls to 20.3 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 = 23.99 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

The current orbit solution is based on 134 observations and has a weighted RMS residual of 0.4965 arcseconds.

Condition code U = 0 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
1.311 AU
Eccentricity
0.2409
Perihelion
0.995 AU
Aphelion
1.62682 AU
Inclination
2.7°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
159.69°

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-Apr-01 15:14 0.031300 AU
4682484 km
3.78 km/s
2030-Apr-15 12:10 0.038927 AU
5823349 km
3.71 km/s
2033-May-08 19:03 0.048040 AU
7186753 km
4.32 km/s
2036-May-25 12:38 0.103784 AU
15525838 km
6.83 km/s
2039-Jan-18 21:44 0.315862 AU
47252231 km
3.85 km/s
2039-Jun-04 16:31 0.205573 AU
30753309 km
10.14 km/s
2042-Jan-02 13:42 0.384980 AU
57592143 km
5.44 km/s
2042-Jun-11 21:44 0.323637 AU
48415367 km
13.66 km/s
2044-Dec-20 21:59 0.442886 AU
66254731 km
6.60 km/s
2045-Jun-18 11:06 0.447703 AU
66975432 km
17.32 km/s
2047-Dec-11 03:04 0.492423 AU
73665441 km
7.46 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
23.99

Orbit Quality

RMS
0.49651
Condition
0
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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