SpaceAtlas Space Object Data
NASA JPL SBDB · 2004 MR1

2004 MR1

2004 MR1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.522 AU it takes 1.88 yr to circle the Sun.

Apollo Observations: 39
Orbital Period · P
1.88 yr
v(q)
35.7 km/s
v(Q)
16.3 km/s
Diameter · ≈
0.03 km
TJ
4.42
Eccentricity · e
0.3731

Orbit and dynamics

Between its closest point (0.954 AU) and its farthest (2.09 AU), the heliocentric distance changes by 1.136 AU over every revolution.

One full revolution takes 1.88 yr (686 days), computed from the semi-major axis of 1.522 AU.

An eccentricity of 0.373 makes the orbit moderately elongated.

Its inclination of 1.78° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35.7 km/s at perihelion and falls to 16.3 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 = 25.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 39 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5191 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.522 AU
Eccentricity
0.3731
Perihelion
0.954 AU
Aphelion
2.089858 AU
Inclination
1.78°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
231.9°

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
25.6

Orbit Quality

RMS
0.51914
Condition
7
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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