SpaceAtlas Space Object Data
NASA JPL SBDB · 2002 AY1

2002 AY1

2002 AY1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.779 AU and a period of 0.69 yr.

Aten Observations: 270
Orbital Period · P
0.69 yr
v(q)
53.9 km/s
v(Q)
21.1 km/s
Diameter · ≈
0.24 km
TJ
7.28
Eccentricity · e
0.4371

Orbit and dynamics

The path is an ellipse reaching 0.439 AU from the Sun at perihelion and 1.12 AU at aphelion, a radial span of 0.681 AU.

Applying Kepler's third law to a = 0.779 AU gives an orbital period of 0.69 yr, or about 251 days.

The high eccentricity (0.437) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 29.9° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 53.9 km/s at perihelion and falls to 21.1 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 = 20.86 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.24 km.

Observation record and orbit quality

The current orbit solution is based on 270 observations and has a weighted RMS residual of 0.3518 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
0.7792 AU
Eccentricity
0.4371
Perihelion
0.439 AU
Aphelion
1.119788 AU
Inclination
29.9°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
75.69°

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
2035-Jan-08 13:07 0.065153 AU
9746723 km
16.91 km/s
2046-Jan-08 00:19 0.104654 AU
15655945 km
16.38 km/s
2055-Jan-04 01:17 0.199512 AU
29846508 km
22.66 km/s
2057-Jan-06 21:23 0.149421 AU
22353116 km
15.93 km/s
2066-Jan-05 07:19 0.148831 AU
22264834 km
21.33 km/s
2068-Jan-06 02:32 0.193535 AU
28952358 km
15.65 km/s
2077-Jan-06 06:59 0.101024 AU
15112957 km
20.15 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
20.86

Orbit Quality

RMS
0.35185
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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