SpaceAtlas Space Object Data
NASA JPL SBDB · 330809

330809

330809 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.542 AU it takes 1.91 yr to circle the Sun.

Apollo Observations: 272
Orbital Period · P
1.91 yr
v(q)
41.9 km/s
v(Q)
13.7 km/s
Diameter · ≈
0.49 km
TJ
4.31
Eccentricity · e
0.5056

Orbit and dynamics

The path is an ellipse reaching 0.762 AU from the Sun at perihelion and 2.322 AU at aphelion, a radial span of 1.56 AU.

Applying Kepler's third law to a = 1.542 AU gives an orbital period of 1.91 yr, or about 699 days.

The high eccentricity (0.506) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 6.91° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 41.9 km/s at perihelion and falls to 13.7 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 = 19.29 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.49 km.

Observation record and orbit quality

The current orbit solution is based on 272 observations and has a weighted RMS residual of 0.4318 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
1.542 AU
Eccentricity
0.5056
Perihelion
0.762 AU
Aphelion
2.321635 AU
Inclination
6.91°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
92.5°

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
2033-Jun-24 00:48 0.104052 AU
15565893 km
12.47 km/s
2052-Nov-17 15:39 0.137835 AU
20619892 km
16.16 km/s
2056-Jun-09 15:09 0.129715 AU
19405104 km
16.94 km/s
2075-Oct-20 08:00 0.191733 AU
28682816 km
10.55 km/s
2077-Jul-13 14:59 0.175851 AU
26306925 km
11.21 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
19.29

Orbit Quality

RMS
0.43175
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.

Keep exploring

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