SpaceAtlas Space Object Data
NASA JPL SBDB · 498918

498918

498918 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.828 AU once every 2.47 yr.

Amor Observations: 145
Orbital Period · P
2.47 yr
v(q)
30.2 km/s
v(Q)
16 km/s
Diameter · ≈
0.65 km
TJ
3.55
Eccentricity · e
0.3065

Orbit and dynamics

The path is an ellipse reaching 1.268 AU from the Sun at perihelion and 2.388 AU at aphelion, a radial span of 1.12 AU.

Applying Kepler's third law to a = 1.828 AU gives an orbital period of 2.47 yr, or about 903 days.

An eccentricity of 0.306 makes the orbit moderately elongated.

A steep inclination of 51.71° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 30.2 km/s at perihelion and falls to 16 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 = 18.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.65 km.

Observation record and orbit quality

The current orbit solution is based on 145 observations and has a weighted RMS residual of 0.5554 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
1.828 AU
Eccentricity
0.3065
Perihelion
1.268 AU
Aphelion
2.388282 AU
Inclination
51.71°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
219.61°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
18.7

Orbit Quality

RMS
0.55543
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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