SpaceAtlas Space Object Data
NASA JPL SBDB · 387668

387668

387668 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.297 AU it takes 1.48 yr to circle the Sun.

Apollo Observations: 158
Orbital Period · P
1.48 yr
v(q)
41.6 km/s
v(Q)
16.4 km/s
Diameter · ≈
0.28 km
TJ
4.84
Eccentricity · e
0.4334

Orbit and dynamics

The path is an ellipse reaching 0.735 AU from the Sun at perihelion and 1.859 AU at aphelion, a radial span of 1.124 AU.

Applying Kepler's third law to a = 1.297 AU gives an orbital period of 1.48 yr, or about 540 days.

The high eccentricity (0.433) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 22.89° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 41.6 km/s at perihelion and falls to 16.4 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 = 20.51 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.28 km.

Observation record and orbit quality

The current orbit solution is based on 158 observations and has a weighted RMS residual of 0.6088 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
1.297 AU
Eccentricity
0.4334
Perihelion
0.735 AU
Aphelion
1.85912 AU
Inclination
22.89°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
63.13°

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
2030-Sep-30 17:07 0.439293 AU
65717356 km
28.75 km/s
2033-Sep-17 22:01 0.168411 AU
25193989 km
21.55 km/s
2036-Sep-04 02:23 0.107411 AU
16068501 km
15.41 km/s
2039-Jul-29 23:37 0.377424 AU
56461889 km
12.49 km/s
2042-Mar-17 08:21 0.378910 AU
56684093 km
12.15 km/s
2045-Mar-17 23:09 0.117842 AU
17628839 km
15.58 km/s
2048-Mar-08 00:19 0.203015 AU
30370638 km
22.08 km/s
2051-Feb-25 10:04 0.473627 AU
70853622 km
29.63 km/s
2064-Sep-23 12:23 0.292112 AU
43699311 km
24.74 km/s
2067-Sep-10 21:56 0.009688 AU
1449301 km
17.82 km/s
2070-Aug-29 14:49 0.205516 AU
30744768 km
13.73 km/s
2073-Jul-17 03:07 0.401546 AU
60070360 km
12.72 km/s
2076-Mar-15 10:31 0.400919 AU
59976621 km
12.12 km/s
2076-May-13 20:24 0.424661 AU
63528372 km
11.03 km/s
2079-Mar-20 17:33 0.197491 AU
29544292 km
13.97 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
20.51

Orbit Quality

RMS
0.60876
Condition
0
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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