5604
5604 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.93 AU and a period of 0.90 yr.
Orbit and dynamics
Between its closest point (0.552 AU) and its farthest (1.308 AU), the heliocentric distance changes by 0.756 AU over every revolution.
One full revolution takes 0.90 yr (328 days), computed from the semi-major axis of 0.93 AU.
The high eccentricity (0.406) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.
Its inclination of 4.7° keeps it close to the plane of the ecliptic.
By the vis-viva equation its orbital speed rises to 47.5 km/s at perihelion and falls to 20.1 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
The measured diameter is 0.55 km, a value from direct size determination rather than from brightness alone.
A geometric albedo of 0.48 points to a comparatively bright, reflective surface.
Observation record and orbit quality
Astrometry from 1,572 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3585 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
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.
