SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 FY

2018 FY

2018 FY is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.981 AU and a period of 0.97 yr.

Aten Observations: 85
Orbital Period · P
0.97 yr
v(q)
34.3 km/s
v(Q)
26.4 km/s
Diameter · ≈
0.08 km
TJ
6.15
Eccentricity · e
0.1306

Orbit and dynamics

Between its closest point (0.853 AU) and its farthest (1.109 AU), the heliocentric distance changes by 0.256 AU over every revolution.

One full revolution takes 0.97 yr (355 days), computed from the semi-major axis of 0.981 AU.

An eccentricity of 0.131 makes the orbit moderately elongated.

The orbital plane is tilted 11° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.3 km/s at perihelion and falls to 26.4 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 = 23.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

Astrometry from 85 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4892 arcseconds.

Condition code U = 2 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
0.9811 AU
Eccentricity
0.1306
Perihelion
0.853 AU
Aphelion
1.109232 AU
Inclination
11.0°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
285.74°

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
2050-Mar-08 10:49 0.366501 AU
54827699 km
15.59 km/s
2051-Mar-02 23:04 0.194278 AU
29063564 km
10.82 km/s
2052-Feb-29 12:54 0.033386 AU
4994428 km
6.98 km/s
2053-Mar-14 23:34 0.129178 AU
19324779 km
5.86 km/s
2053-Oct-10 02:34 0.175101 AU
26194740 km
6.41 km/s
2054-Sep-03 02:54 0.090633 AU
13558498 km
6.60 km/s
2055-Aug-10 08:37 0.130206 AU
19478566 km
8.37 km/s
2056-Jul-25 05:56 0.267910 AU
40078754 km
11.97 km/s
2057-Jul-14 04:11 0.420037 AU
62836618 km
16.27 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
23.3

Orbit Quality

RMS
0.48924
Condition
2
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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