SpaceAtlas Space Object Data
NASA JPL SBDB · 1991 VG

1991 VG

1991 VG belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.032 AU it takes 1.05 yr to circle the Sun.

Apollo Observations: 70
Orbital Period · P
1.05 yr
v(q)
30.9 km/s
v(Q)
27.8 km/s
Diameter · ≈
0.01 km
TJ
5.93
Eccentricity · e
0.0525

Orbit and dynamics

Between its closest point (0.978 AU) and its farthest (1.086 AU), the heliocentric distance changes by 0.108 AU over every revolution.

One full revolution takes 1.05 yr (383 days), computed from the semi-major axis of 1.032 AU.

With e = 0.052, the orbit is close to circular.

Its inclination of 1.43° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 30.9 km/s at perihelion and falls to 27.8 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 = 28.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 70 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4901 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
1.032 AU
Eccentricity
0.0525
Perihelion
0.978 AU
Aphelion
1.08618 AU
Inclination
1.43°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
14.01°

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
2037-Oct-16 21:15 0.375364 AU
56153635 km
12.05 km/s
2038-Nov-07 13:23 0.070178 AU
10498494 km
2.97 km/s
2039-May-28 08:32 0.059875 AU
8957106 km
1.47 km/s
2040-Feb-26 08:58 0.171563 AU
25665478 km
5.92 km/s
2041-Mar-15 03:18 0.450459 AU
67387659 km
14.30 km/s
2060-Oct-08 08:07 0.450261 AU
67358147 km
14.26 km/s
2061-Oct-26 19:25 0.171684 AU
25683497 km
5.97 km/s
2062-Jul-27 00:05 0.063156 AU
9447943 km
1.35 km/s
2063-Feb-14 20:40 0.071338 AU
10671968 km
2.85 km/s
2064-Mar-06 21:14 0.375179 AU
56125922 km
12.06 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
28.3

Orbit Quality

RMS
0.49009
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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