SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 BT1

2018 BT1

2018 BT1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.865 AU and a period of 0.80 yr.

Aten Observations: 139
Orbital Period · P
0.80 yr
v(q)
44.1 km/s
v(Q)
23.3 km/s
Diameter · ≈
0.09 km
TJ
6.69
Eccentricity · e
0.3095

Orbit and dynamics

The path is an ellipse reaching 0.597 AU from the Sun at perihelion and 1.133 AU at aphelion, a radial span of 0.536 AU.

Applying Kepler's third law to a = 0.865 AU gives an orbital period of 0.80 yr, or about 294 days.

An eccentricity of 0.309 makes the orbit moderately elongated.

A steep inclination of 29.91° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 44.1 km/s at perihelion and falls to 23.3 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 = 23.06 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 139 observations and has a weighted RMS residual of 0.3654 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
0.8652 AU
Eccentricity
0.3095
Perihelion
0.597 AU
Aphelion
1.132979 AU
Inclination
29.91°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
36.87°

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
2047-Jan-21 08:42 0.178801 AU
26748185 km
19.87 km/s
2051-Jan-23 08:48 0.059653 AU
8923929 km
17.33 km/s
2055-Jan-23 08:43 0.083144 AU
12438223 km
15.81 km/s
2059-Jan-20 17:38 0.194651 AU
29119374 km
15.17 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
23.06

Orbit Quality

RMS
0.36535
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.

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