SpaceAtlas Space Object Data
NASA JPL SBDB · 302830

302830

302830 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.473 AU it takes 1.79 yr to circle the Sun.

Apollo Observations: 401
Orbital Period · P
1.79 yr
v(q)
39.5 km/s
v(Q)
15.3 km/s
Diameter · ≈
0.61 km
TJ
4.45
Eccentricity · e
0.4422

Orbit and dynamics

The path is an ellipse reaching 0.821 AU from the Sun at perihelion and 2.124 AU at aphelion, a radial span of 1.303 AU.

Applying Kepler's third law to a = 1.473 AU gives an orbital period of 1.79 yr, or about 653 days.

The high eccentricity (0.442) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 16.97° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 39.5 km/s at perihelion and falls to 15.3 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 = 18.81 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.61 km.

Observation record and orbit quality

The current orbit solution is based on 401 observations and has a weighted RMS residual of 0.4944 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
1.473 AU
Eccentricity
0.4422
Perihelion
0.821 AU
Aphelion
2.124361 AU
Inclination
16.97°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
35.57°

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
2028-Mar-11 13:56 0.358320 AU
53603894 km
18.95 km/s
2029-Sep-19 12:01 0.496250 AU
74237875 km
26.39 km/s
2037-Jan-06 08:01 0.289193 AU
43262610 km
11.04 km/s
2045-Oct-27 23:04 0.075303 AU
11265227 km
13.33 km/s
2053-Mar-19 12:39 0.486527 AU
72783339 km
23.85 km/s
2054-Sep-29 14:41 0.329590 AU
49305920 km
21.79 km/s
2062-Mar-03 04:29 0.267911 AU
40078951 km
12.90 km/s
2070-Nov-25 08:15 0.203678 AU
30469869 km
12.19 km/s
2071-Mar-19 01:38 0.435247 AU
65111953 km
9.22 km/s
2079-Oct-12 17:34 0.145756 AU
21804755 km
16.85 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
18.81

Orbit Quality

RMS
0.4944
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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