SpaceAtlas Space Object Data
NASA JPL SBDB · 2003 SR84

2003 SR84

2003 SR84 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.707 AU it takes 2.23 yr to circle the Sun.

Apollo Observations: 287
Orbital Period · P
2.23 yr
v(q)
38.3 km/s
v(Q)
13.6 km/s
Diameter · ≈
0.02 km
TJ
4.05
Eccentricity · e
0.4766

Orbit and dynamics

The path is an ellipse reaching 0.893 AU from the Sun at perihelion and 2.521 AU at aphelion, a radial span of 1.628 AU.

Applying Kepler's third law to a = 1.707 AU gives an orbital period of 2.23 yr, or about 815 days.

The high eccentricity (0.477) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.53° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.3 km/s at perihelion and falls to 13.6 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 = 26 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 287 observations and has a weighted RMS residual of 0.3378 arcseconds.

Condition code U = 5 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.707 AU
Eccentricity
0.4766
Perihelion
0.893 AU
Aphelion
2.520556 AU
Inclination
7.53°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
48.11°

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
2032-Sep-19 09:53 0.060219 AU
9008595 km
12.81 km/s
2044-Jan-28 23:36 0.420688 AU
62933962 km
22.28 km/s
2052-Nov-18 01:15 0.136761 AU
20459218 km
8.70 km/s
2061-Sep-04 02:33 0.298797 AU
44699441 km
19.57 km/s
2073-Jan-15 01:43 0.192011 AU
28724367 km
15.07 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
26.0

Orbit Quality

RMS
0.33784
Condition
5
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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