SpaceAtlas Space Object Data
NASA JPL SBDB · 498548

498548

498548 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.273 AU it takes 1.44 yr to circle the Sun.

Apollo Observations: 281
Orbital Period · P
1.44 yr
v(q)
35.2 km/s
v(Q)
19.8 km/s
Diameter · ≈
0.35 km
TJ
4.92
Eccentricity · e
0.281

Orbit and dynamics

Between its closest point (0.915 AU) and its farthest (1.631 AU), the heliocentric distance changes by 0.716 AU over every revolution.

One full revolution takes 1.44 yr (525 days), computed from the semi-major axis of 1.273 AU.

An eccentricity of 0.281 makes the orbit moderately elongated.

A steep inclination of 29.24° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 35.2 km/s at perihelion and falls to 19.8 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 = 20.04 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.35 km.

Observation record and orbit quality

Astrometry from 281 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4905 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
1.273 AU
Eccentricity
0.281
Perihelion
0.915 AU
Aphelion
1.630713 AU
Inclination
29.24°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
321.33°

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
20.04

Orbit Quality

RMS
0.49048
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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