SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 HW6

2020 HW6

2020 HW6 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.208 AU it takes 1.33 yr to circle the Sun.

Apollo Observations: 82
Orbital Period · P
1.33 yr
v(q)
33.1 km/s
v(Q)
22.2 km/s
Diameter · ≈
0.02 km
TJ
5.24
Eccentricity · e
0.1986

Orbit and dynamics

Between its closest point (0.968 AU) and its farthest (1.448 AU), the heliocentric distance changes by 0.48 AU over every revolution.

One full revolution takes 1.33 yr (485 days), computed from the semi-major axis of 1.208 AU.

An eccentricity of 0.199 makes the orbit moderately elongated.

The orbital plane is tilted 10.19° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.1 km/s at perihelion and falls to 22.2 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 = 26 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 82 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4551 arcseconds.

Condition code U = 5 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.208 AU
Eccentricity
0.1986
Perihelion
0.968 AU
Aphelion
1.447909 AU
Inclination
10.19°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
244.11°

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-28 05:29 0.133119 AU
19914354 km
6.19 km/s
2032-Feb-09 13:14 0.212766 AU
31829345 km
7.64 km/s
2036-Jan-22 20:15 0.302610 AU
45269760 km
11.48 km/s
2036-Jul-11 01:01 0.369084 AU
55214137 km
4.62 km/s
2040-Jan-14 10:27 0.416318 AU
62280335 km
15.49 km/s
2040-Aug-01 02:05 0.414618 AU
62025938 km
5.87 km/s
2044-Aug-16 15:09 0.443107 AU
66287912 km
6.81 km/s
2048-Aug-29 21:37 0.459330 AU
68714802 km
7.50 km/s
2052-Sep-10 19:58 0.465576 AU
69649118 km
7.98 km/s
2056-Sep-21 22:58 0.461892 AU
69098112 km
8.30 km/s
2060-Oct-02 16:11 0.450136 AU
67339433 km
8.46 km/s
2064-Oct-13 10:00 0.430756 AU
64440161 km
8.48 km/s
2068-Oct-24 06:55 0.404195 AU
60466667 km
8.31 km/s
2072-Nov-04 13:51 0.371125 AU
55519539 km
7.96 km/s
2073-May-28 06:29 0.418232 AU
62566580 km
17.08 km/s
2076-Nov-16 10:58 0.333125 AU
49834860 km
7.42 km/s
2077-May-20 18:48 0.289050 AU
43241311 km
13.54 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
26.0

Orbit Quality

RMS
0.45506
Condition
5
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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