SpaceAtlas Space Object Data
NASA JPL SBDB · 471984

471984

471984 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.026 AU it takes 1.04 yr to circle the Sun.

Apollo Observations: 115
Orbital Period · P
1.04 yr
v(q)
37 km/s
v(Q)
23.4 km/s
Diameter · ≈
0.1 km
TJ
5.94
Eccentricity · e
0.2256

Orbit and dynamics

Between its closest point (0.795 AU) and its farthest (1.257 AU), the heliocentric distance changes by 0.462 AU over every revolution.

One full revolution takes 1.04 yr (380 days), computed from the semi-major axis of 1.026 AU.

An eccentricity of 0.226 makes the orbit moderately elongated.

Its inclination of 3.36° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 37 km/s at perihelion and falls to 23.4 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 = 22.86 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.1 km.

Observation record and orbit quality

Astrometry from 115 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3428 arcseconds.

Condition code U = 2 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
1.026 AU
Eccentricity
0.2256
Perihelion
0.795 AU
Aphelion
1.257466 AU
Inclination
3.36°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
299.23°

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
2038-Nov-24 20:32 0.263590 AU
39432498 km
14.63 km/s
2039-Dec-05 05:04 0.027890 AU
4172220 km
7.22 km/s
2040-Oct-30 03:21 0.186531 AU
27904591 km
5.17 km/s
2041-Feb-02 19:49 0.179778 AU
26894416 km
5.89 km/s
2041-Sep-22 01:27 0.251527 AU
37627924 km
6.24 km/s
2042-Mar-26 16:17 0.200318 AU
29967199 km
6.96 km/s
2042-Aug-18 07:42 0.237065 AU
35464491 km
5.75 km/s
2043-Jun-03 00:11 0.107247 AU
16043886 km
4.19 km/s
2044-Jun-24 00:09 0.126526 AU
18927978 km
10.24 km/s
2045-Jul-05 00:19 0.348754 AU
52172878 km
16.87 km/s
2065-Nov-15 23:50 0.457882 AU
68498180 km
20.57 km/s
2066-Nov-26 12:06 0.228281 AU
34150422 km
13.56 km/s
2067-Dec-05 23:18 0.024223 AU
3623687 km
6.59 km/s
2068-Oct-25 16:42 0.196602 AU
29411285 km
5.37 km/s
2069-Feb-08 13:32 0.185992 AU
27824045 km
6.23 km/s
2069-Sep-18 17:04 0.253576 AU
37934496 km
6.27 km/s
2070-Mar-31 20:02 0.196670 AU
29421406 km
6.86 km/s
2070-Aug-14 05:25 0.230488 AU
34480521 km
5.61 km/s
2071-Jun-10 22:23 0.082477 AU
12338330 km
4.60 km/s
2072-Jun-25 08:23 0.149174 AU
22316055 km
11.03 km/s
2073-Jul-06 03:34 0.371154 AU
55523908 km
17.67 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
22.86

Orbit Quality

RMS
0.34277
Condition
2
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.

Keep exploring

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