SpaceAtlas Space Object Data
NASA JPL SBDB · 2016 EC157

2016 EC157

2016 EC157 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.921 AU and a period of 0.88 yr.

Aten Observations: 54
Orbital Period · P
0.88 yr
v(q)
44.8 km/s
v(Q)
21.5 km/s
Diameter · ≈
0.07 km
TJ
6.43
Eccentricity · e
0.3524

Orbit and dynamics

The path is an ellipse reaching 0.597 AU from the Sun at perihelion and 1.246 AU at aphelion, a radial span of 0.649 AU.

Applying Kepler's third law to a = 0.921 AU gives an orbital period of 0.88 yr, or about 323 days.

An eccentricity of 0.352 makes the orbit moderately elongated.

The orbital plane is tilted 5.59° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 44.8 km/s at perihelion and falls to 21.5 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 = 23.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

The current orbit solution is based on 54 observations and has a weighted RMS residual of 0.6435 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
0.9214 AU
Eccentricity
0.3524
Perihelion
0.597 AU
Aphelion
1.246101 AU
Inclination
5.59°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
65.69°

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-Dec-31 11:48 0.150084 AU
22452176 km
14.19 km/s
2030-Sep-24 20:40 0.391952 AU
58635194 km
14.49 km/s
2031-Mar-10 20:59 0.249835 AU
37374790 km
8.72 km/s
2031-Jul-01 06:55 0.349402 AU
52269748 km
10.34 km/s
2032-Apr-12 05:58 0.312287 AU
46717445 km
20.25 km/s
2038-Jan-03 23:10 0.155139 AU
23208467 km
7.55 km/s
2038-Aug-28 03:26 0.415493 AU
62156890 km
15.63 km/s
2039-Apr-13 16:51 0.138914 AU
20781234 km
7.96 km/s
2045-Jan-09 07:30 0.360024 AU
53858803 km
21.52 km/s
2045-Oct-25 12:18 0.328429 AU
49132319 km
10.74 km/s
2046-Feb-09 20:21 0.253258 AU
37886819 km
8.65 km/s
2046-Aug-01 08:16 0.403947 AU
60429568 km
14.30 km/s
2047-Apr-20 17:37 0.093375 AU
13968667 km
13.29 km/s
2052-Dec-30 15:34 0.134353 AU
20098872 km
13.54 km/s
2053-Sep-22 04:12 0.395525 AU
59169631 km
14.72 km/s
2054-Mar-13 08:17 0.244829 AU
36625863 km
8.68 km/s
2054-Jun-27 11:46 0.341033 AU
51017790 km
9.76 km/s
2055-Apr-12 05:18 0.332809 AU
49787487 km
20.90 km/s
2061-Jan-07 21:11 0.170176 AU
25457903 km
7.46 km/s
2061-Aug-25 02:39 0.415893 AU
62216751 km
15.62 km/s
2062-Apr-16 17:07 0.117820 AU
17625612 km
8.17 km/s
2068-Jan-08 15:15 0.325677 AU
48720525 km
20.40 km/s
2068-Oct-19 19:05 0.342186 AU
51190224 km
11.54 km/s
2069-Feb-14 08:45 0.258654 AU
38694079 km
8.75 km/s
2069-Jul-27 18:21 0.398759 AU
59653433 km
13.90 km/s
2070-Apr-19 14:34 0.125515 AU
18776709 km
14.33 km/s
2075-Dec-30 10:00 0.112238 AU
16790538 km
12.42 km/s
2076-Sep-17 17:16 0.400926 AU
59977650 km
15.02 km/s
2077-Mar-18 00:07 0.234090 AU
35019377 km
8.54 km/s
2077-Jun-20 09:05 0.324367 AU
48524676 km
8.62 km/s
2078-Apr-10 13:23 0.369591 AU
55290023 km
22.08 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
23.6

Orbit Quality

RMS
0.64353
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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