SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 ER2

2019 ER2

2019 ER2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.231 AU it takes 1.37 yr to circle the Sun.

Apollo Observations: 33
Orbital Period · P
1.37 yr
v(q)
32.8 km/s
v(Q)
22 km/s
Diameter · ≈
0.02 km
TJ
5.18
Eccentricity · e
0.1971

Orbit and dynamics

Between its closest point (0.989 AU) and its farthest (1.474 AU), the heliocentric distance changes by 0.485 AU over every revolution.

One full revolution takes 1.37 yr (499 days), computed from the semi-major axis of 1.231 AU.

An eccentricity of 0.197 makes the orbit moderately elongated.

Its inclination of 3.6° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 32.8 km/s at perihelion and falls to 22 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 = 25.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 33 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3476 arcseconds.

Condition code U = 6 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
1.231 AU
Eccentricity
0.1971
Perihelion
0.989 AU
Aphelion
1.47363 AU
Inclination
3.6°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
79.51°

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
2030-Feb-23 04:48 0.400337 AU
59889538 km
17.44 km/s
2030-Sep-09 22:36 0.376808 AU
56369745 km
6.46 km/s
2037-Nov-27 19:02 0.444554 AU
66504335 km
7.61 km/s
2041-Oct-10 09:42 0.460487 AU
68887868 km
7.84 km/s
2045-Mar-10 01:10 0.096351 AU
14413847 km
9.01 km/s
2048-Dec-29 08:59 0.345818 AU
51733660 km
5.89 km/s
2049-Jul-03 06:24 0.302162 AU
45202743 km
14.19 km/s
2052-Nov-05 14:28 0.482471 AU
72176679 km
8.09 km/s
2056-Sep-17 18:27 0.408288 AU
61078966 km
6.94 km/s
2063-Dec-02 06:02 0.447359 AU
66923954 km
7.47 km/s
2067-Oct-13 01:37 0.472421 AU
70673163 km
7.92 km/s
2071-Mar-10 00:38 0.170194 AU
25460632 km
9.25 km/s
2071-Aug-08 01:10 0.280584 AU
41974778 km
4.06 km/s
2074-Dec-28 15:06 0.367356 AU
54955650 km
5.98 km/s
2075-Jul-04 16:41 0.356125 AU
53275535 km
14.55 km/s
2078-Nov-04 00:00 0.484805 AU
72525817 km
8.14 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
25.9

Orbit Quality

RMS
0.3476
Condition
6
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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