SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 BT

2017 BT

2017 BT is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.381 AU once every 1.62 yr.

Amor Observations: 90
Orbital Period · P
1.62 yr
v(q)
32.3 km/s
v(Q)
19.9 km/s
Diameter · ≈
0.12 km
TJ
4.76
Eccentricity · e
0.2376

Orbit and dynamics

The path is an ellipse reaching 1.053 AU from the Sun at perihelion and 1.709 AU at aphelion, a radial span of 0.656 AU.

Applying Kepler's third law to a = 1.381 AU gives an orbital period of 1.62 yr, or about 593 days.

An eccentricity of 0.238 makes the orbit moderately elongated.

The orbital plane is tilted 9.58° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.3 km/s at perihelion and falls to 19.9 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 22.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

The current orbit solution is based on 90 observations and has a weighted RMS residual of 0.5141 arcseconds.

Condition code U = 4 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
1.381 AU
Eccentricity
0.2376
Perihelion
1.053 AU
Aphelion
1.709126 AU
Inclination
9.58°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
294.27°

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-Jan-01 18:59 0.075073 AU
11230755 km
5.56 km/s
2042-Dec-29 16:47 0.171734 AU
25691010 km
6.49 km/s
2050-Sep-16 11:32 0.448090 AU
67033305 km
5.66 km/s
2055-Dec-29 22:51 0.341872 AU
51143363 km
9.49 km/s
2056-Feb-16 13:24 0.343430 AU
51376423 km
4.04 km/s
2063-Oct-13 02:38 0.366703 AU
54858051 km
2.81 km/s
2064-Jan-14 06:38 0.357352 AU
53459112 km
12.17 km/s
2069-Mar-26 18:43 0.445757 AU
66684298 km
4.83 km/s
2077-Jan-07 09:05 0.181111 AU
27093875 km
7.96 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
22.3

Orbit Quality

RMS
0.51408
Condition
4
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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