SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 AG1

2018 AG1

2018 AG1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.735 AU it takes 2.29 yr to circle the Sun.

Apollo Observations: 46
Orbital Period · P
2.29 yr
v(q)
48 km/s
v(Q)
10.6 km/s
Diameter · ≈
0.14 km
TJ
3.89
Eccentricity · e
0.6369

Orbit and dynamics

Between its closest point (0.63 AU) and its farthest (2.84 AU), the heliocentric distance changes by 2.21 AU over every revolution.

One full revolution takes 2.29 yr (835 days), computed from the semi-major axis of 1.735 AU.

The high eccentricity (0.637) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.82° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 48 km/s at perihelion and falls to 10.6 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 = 22.09 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.14 km.

Observation record and orbit quality

Astrometry from 46 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5021 arcseconds.

Condition code U = 2 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
1.735 AU
Eccentricity
0.6369
Perihelion
0.63 AU
Aphelion
2.840022 AU
Inclination
5.82°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
268.75°

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
2031-Jun-16 02:41 0.337909 AU
50550443 km
28.74 km/s
2033-Dec-31 20:30 0.083605 AU
12507106 km
21.30 km/s
2040-Sep-17 04:25 0.375218 AU
56131873 km
17.85 km/s
2047-Jun-19 12:26 0.271449 AU
40608191 km
26.78 km/s
2050-Jan-05 09:27 0.166829 AU
24957304 km
23.86 km/s
2056-Sep-30 03:04 0.378943 AU
56689017 km
18.31 km/s
2063-Jun-25 01:13 0.166097 AU
24847826 km
23.62 km/s
2066-Jan-11 14:42 0.288013 AU
43086118 km
27.54 km/s
2072-Oct-16 17:09 0.366651 AU
54850160 km
17.83 km/s
2079-Jul-05 20:34 0.050584 AU
7567268 km
18.09 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
22.09

Orbit Quality

RMS
0.50212
Condition
2
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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