SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 PM57

2015 PM57

2015 PM57 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.206 AU it takes 3.28 yr to circle the Sun.

Apollo Observations: 113
Orbital Period · P
3.28 yr
v(q)
51.2 km/s
v(Q)
7.8 km/s
Diameter · ≈
0.65 km
TJ
3.2
Eccentricity · e
0.7343

Orbit and dynamics

Between its closest point (0.586 AU) and its farthest (3.826 AU), the heliocentric distance changes by 3.24 AU over every revolution.

One full revolution takes 3.28 yr (1,197 days), computed from the semi-major axis of 2.206 AU.

The high eccentricity (0.734) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 17.38° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 51.2 km/s at perihelion and falls to 7.8 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

The measured diameter is 0.58 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.187 points to a comparatively bright, reflective surface.

Observation record and orbit quality

Astrometry from 113 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5502 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
2.206 AU
Eccentricity
0.7343
Perihelion
0.586 AU
Aphelion
3.825866 AU
Inclination
17.38°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
76.24°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
0.585 km
Albedo
0.187
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
18.68

Orbit Quality

RMS
0.55017
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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