SpaceAtlas Space Object Data
NASA JPL SBDB · 2001 GR2

2001 GR2

2001 GR2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.862 AU it takes 2.54 yr to circle the Sun.

Apollo Observations: 78
Orbital Period · P
2.54 yr
v(q)
45.2 km/s
v(Q)
10.5 km/s
Diameter · ≈
0.15 km
TJ
3.71
Eccentricity · e
0.6224

Orbit and dynamics

Between its closest point (0.703 AU) and its farthest (3.021 AU), the heliocentric distance changes by 2.318 AU over every revolution.

One full revolution takes 2.54 yr (928 days), computed from the semi-major axis of 1.862 AU.

The high eccentricity (0.622) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 11.84° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 45.2 km/s at perihelion and falls to 10.5 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 = 21.85 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.15 km.

Observation record and orbit quality

Astrometry from 78 individual observations underpins this orbit; the fit leaves an RMS residual of 0.443 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
1.862 AU
Eccentricity
0.6224
Perihelion
0.703 AU
Aphelion
3.020909 AU
Inclination
11.84°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
299.64°

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
21.85

Orbit Quality

RMS
0.44302
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.