SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 PA57

2015 PA57

2015 PA57 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.189 AU it takes 1.30 yr to circle the Sun.

Apollo Observations: 58
Orbital Period · P
1.30 yr
v(q)
39.7 km/s
v(Q)
18.8 km/s
Diameter · ≈
0.04 km
TJ
5.27
Eccentricity · e
0.3588

Orbit and dynamics

Between its closest point (0.763 AU) and its farthest (1.616 AU), the heliocentric distance changes by 0.853 AU over every revolution.

One full revolution takes 1.30 yr (474 days), computed from the semi-major axis of 1.189 AU.

An eccentricity of 0.359 makes the orbit moderately elongated.

Its inclination of 2.06° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39.7 km/s at perihelion and falls to 18.8 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 = 24.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 58 individual observations underpins this orbit; the fit leaves an RMS residual of 0.2228 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
1.189 AU
Eccentricity
0.3588
Perihelion
0.763 AU
Aphelion
1.615613 AU
Inclination
2.06°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
179.2°

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
2032-Feb-14 16:59 0.023998 AU
3590019 km
9.57 km/s
2037-Aug-20 19:34 0.295457 AU
44199695 km
20.68 km/s
2040-Dec-21 16:48 0.477350 AU
71410505 km
9.41 km/s
2041-Jun-07 21:02 0.214215 AU
32046169 km
9.19 km/s
2045-Feb-11 02:09 0.024269 AU
3630550 km
10.92 km/s
2050-Aug-18 23:18 0.262015 AU
39196880 km
19.28 km/s
2053-Dec-25 13:45 0.454279 AU
67959225 km
9.09 km/s
2054-May-30 01:57 0.228251 AU
34145853 km
9.71 km/s
2054-Aug-26 19:39 0.315871 AU
47253636 km
6.14 km/s
2058-Feb-08 07:16 0.029228 AU
4372458 km
12.56 km/s
2063-Aug-16 06:37 0.195429 AU
29235760 km
17.33 km/s
2067-Jan-01 01:04 0.393259 AU
58830717 km
8.52 km/s
2071-Feb-04 02:01 0.026702 AU
3994633 km
15.31 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
24.5

Orbit Quality

RMS
0.22277
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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