SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 BT45

2013 BT45

2013 BT45 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.119 AU it takes 1.18 yr to circle the Sun.

Apollo Observations: 37
Orbital Period · P
1.18 yr
v(q)
42.9 km/s
v(Q)
18.5 km/s
Diameter · ≈
0.09 km
TJ
5.44
Eccentricity · e
0.3987

Orbit and dynamics

The path is an ellipse reaching 0.673 AU from the Sun at perihelion and 1.565 AU at aphelion, a radial span of 0.892 AU.

Applying Kepler's third law to a = 1.119 AU gives an orbital period of 1.18 yr, or about 432 days.

An eccentricity of 0.399 makes the orbit moderately elongated.

A steep inclination of 22.01° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 42.9 km/s at perihelion and falls to 18.5 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 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

The current orbit solution is based on 37 observations and has a weighted RMS residual of 0.5725 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
1.119 AU
Eccentricity
0.3987
Perihelion
0.673 AU
Aphelion
1.565145 AU
Inclination
22.01°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
42.76°

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-Aug-14 17:57 0.162054 AU
24242971 km
18.07 km/s
2045-Jan-25 16:27 0.175443 AU
26245940 km
20.26 km/s
2058-Jan-29 18:28 0.084508 AU
12642176 km
16.96 km/s
2059-Jul-28 13:52 0.195316 AU
29218845 km
15.27 km/s
2071-Jan-31 19:23 0.125511 AU
18776206 km
14.61 km/s
2072-Aug-08 00:50 0.153715 AU
22995382 km
16.69 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
23.0

Orbit Quality

RMS
0.57246
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

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