SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 QT1

2018 QT1

2018 QT1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.659 AU and a period of 0.53 yr.

Aten Observations: 173
Orbital Period · P
0.53 yr
v(q)
72.8 km/s
v(Q)
18.5 km/s
Diameter · ≈
0.14 km
TJ
8.47
Eccentricity · e
0.5952

Orbit and dynamics

Between its closest point (0.267 AU) and its farthest (1.051 AU), the heliocentric distance changes by 0.784 AU over every revolution.

One full revolution takes 0.53 yr (195 days), computed from the semi-major axis of 0.659 AU.

The high eccentricity (0.595) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.94° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 72.8 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 = 22.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.14 km.

Observation record and orbit quality

Astrometry from 173 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3024 arcseconds.

Condition code U = 1 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
0.6587 AU
Eccentricity
0.5952
Perihelion
0.267 AU
Aphelion
1.050758 AU
Inclination
7.94°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
344.14°

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
2033-Sep-12 04:22 0.075937 AU
11360020 km
11.45 km/s
2040-Sep-26 09:00 0.100260 AU
14998667 km
15.82 km/s
2041-Aug-27 19:35 0.092250 AU
13800345 km
12.25 km/s
2048-Sep-21 17:20 0.041083 AU
6145868 km
12.17 km/s
2049-Aug-21 22:03 0.149952 AU
22432536 km
15.90 km/s
2055-Sep-26 06:52 0.161472 AU
24155896 km
17.98 km/s
2056-Sep-03 11:17 0.087557 AU
13098359 km
11.59 km/s
2063-Sep-25 18:08 0.034883 AU
5218349 km
13.21 km/s
2064-Aug-22 12:14 0.118464 AU
17722025 km
14.29 km/s
2071-Sep-12 17:29 0.075965 AU
11364224 km
11.45 km/s
2078-Sep-27 02:10 0.092526 AU
13841629 km
15.54 km/s
2079-Aug-27 23:21 0.093288 AU
13955723 km
12.37 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
22.1

Orbit Quality

RMS
0.30241
Condition
1
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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