SpaceAtlas Space Object Data
NASA JPL SBDB · 1998 GC1

1998 GC1

1998 GC1 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.441 AU once every 1.73 yr.

Amor Observations: 100
Orbital Period · P
1.73 yr
v(q)
33.5 km/s
v(Q)
18.4 km/s
Diameter · ≈
0.2 km
TJ
4.56
Eccentricity · e
0.2924

Orbit and dynamics

The path is an ellipse reaching 1.02 AU from the Sun at perihelion and 1.862 AU at aphelion, a radial span of 0.842 AU.

Applying Kepler's third law to a = 1.441 AU gives an orbital period of 1.73 yr, or about 632 days.

An eccentricity of 0.292 makes the orbit moderately elongated.

The orbital plane is tilted 18.73° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.5 km/s at perihelion and falls to 18.4 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 21.27 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.2 km.

Observation record and orbit quality

The current orbit solution is based on 100 observations and has a weighted RMS residual of 0.6209 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
1.441 AU
Eccentricity
0.2924
Perihelion
1.02 AU
Aphelion
1.862348 AU
Inclination
18.73°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
134.64°

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-Nov-02 19:18 0.452799 AU
67737835 km
10.38 km/s
2036-Apr-08 07:21 0.440220 AU
65856031 km
19.39 km/s
2042-Dec-07 03:54 0.336803 AU
50385069 km
9.13 km/s
2043-Mar-28 22:16 0.155980 AU
23334339 km
10.27 km/s
2061-Nov-22 21:25 0.346115 AU
51778008 km
9.19 km/s
2062-Mar-30 10:59 0.163934 AU
24524207 km
12.50 km/s
2068-Dec-13 12:34 0.485177 AU
72581387 km
15.16 km/s
2069-Apr-11 04:36 0.403057 AU
60296458 km
9.57 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
21.27

Orbit Quality

RMS
0.62093
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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