SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 EM1

2019 EM1

2019 EM1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.671 AU and a period of 0.55 yr.

Aten Observations: 135
Orbital Period · P
0.55 yr
v(q)
67.6 km/s
v(Q)
19.6 km/s
Diameter · ≈
0.12 km
TJ
8.28
Eccentricity · e
0.5509

Orbit and dynamics

Between its closest point (0.301 AU) and its farthest (1.04 AU), the heliocentric distance changes by 0.739 AU over every revolution.

One full revolution takes 0.55 yr (201 days), computed from the semi-major axis of 0.671 AU.

The high eccentricity (0.551) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 28.45° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 67.6 km/s at perihelion and falls to 19.6 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 = 22.29 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

Astrometry from 135 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4037 arcseconds.

Condition code U = 1 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
0.6709 AU
Eccentricity
0.5509
Perihelion
0.301 AU
Aphelion
1.040499 AU
Inclination
28.45°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
217.16°

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
2029-Mar-20 02:50 0.380802 AU
56967205 km
21.66 km/s
2030-Mar-01 12:13 0.028412 AU
4250409 km
16.36 km/s
2031-Mar-10 22:34 0.463699 AU
69368385 km
30.18 km/s
2035-Mar-15 17:38 0.234461 AU
35074847 km
16.86 km/s
2036-Feb-29 13:40 0.168693 AU
25236040 km
20.72 km/s
2040-Mar-19 05:06 0.439342 AU
65724629 km
24.05 km/s
2041-Mar-04 04:34 0.091360 AU
13667247 km
15.79 km/s
2042-Mar-07 13:46 0.383436 AU
57361189 km
27.44 km/s
2046-Mar-18 16:28 0.286485 AU
42857571 km
18.22 km/s
2047-Feb-28 09:13 0.089121 AU
13332328 km
18.63 km/s
2052-Mar-08 01:28 0.149461 AU
22359110 km
15.77 km/s
2053-Mar-04 11:42 0.301733 AU
45138621 km
24.77 km/s
2057-Mar-20 01:21 0.340035 AU
50868545 km
20.07 km/s
2058-Feb-28 12:48 0.017175 AU
2569317 km
17.09 km/s
2063-Mar-11 21:40 0.186444 AU
27891570 km
16.04 km/s
2064-Mar-02 17:33 0.250969 AU
37544418 km
23.17 km/s
2068-Mar-20 03:05 0.363469 AU
54374221 km
20.94 km/s
2069-Feb-28 18:54 0.006893 AU
1031193 km
16.69 km/s
2070-Mar-11 16:05 0.482621 AU
72199109 km
30.90 km/s
2074-Mar-15 22:15 0.237057 AU
35463150 km
16.90 km/s
2075-Mar-01 06:56 0.157339 AU
23537628 km
20.42 km/s
2079-Mar-19 13:43 0.466140 AU
69733491 km
25.19 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
22.29

Orbit Quality

RMS
0.40366
Condition
1
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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