SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 AZ44

2015 AZ44

2015 AZ44 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.473 AU it takes 1.79 yr to circle the Sun.

Apollo Observations: 68
Orbital Period · P
1.79 yr
v(q)
34.2 km/s
v(Q)
17.6 km/s
Diameter · ≈
0.2 km
TJ
4.53
Eccentricity · e
0.3196

Orbit and dynamics

Between its closest point (1.002 AU) and its farthest (1.944 AU), the heliocentric distance changes by 0.942 AU over every revolution.

One full revolution takes 1.79 yr (653 days), computed from the semi-major axis of 1.473 AU.

An eccentricity of 0.32 makes the orbit moderately elongated.

The orbital plane is tilted 9.78° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.2 km/s at perihelion and falls to 17.6 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 21.28 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.2 km.

Observation record and orbit quality

Astrometry from 68 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6674 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
1.473 AU
Eccentricity
0.3196
Perihelion
1.002 AU
Aphelion
1.943771 AU
Inclination
9.78°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
207.01°

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
2030-Nov-04 20:34 0.189568 AU
28358982 km
7.31 km/s
2039-Aug-08 23:39 0.190728 AU
28532510 km
11.70 km/s
2039-Dec-12 12:24 0.359985 AU
53853046 km
5.29 km/s
2055-Jul-20 19:26 0.400460 AU
59907924 km
5.27 km/s
2055-Nov-20 20:21 0.311505 AU
46600457 km
13.17 km/s
2064-Aug-18 19:31 0.093694 AU
14016357 km
7.38 km/s
2073-Jul-28 23:52 0.397286 AU
59433114 km
17.55 km/s
2074-Jan-02 04:28 0.488615 AU
73095742 km
7.61 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
21.28

Orbit Quality

RMS
0.66743
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.

Keep exploring

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