SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 DA

2018 DA

2018 DA is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.904 AU and a period of 0.86 yr.

Aten Observations: 72
Orbital Period · P
0.86 yr
v(q)
50.4 km/s
v(Q)
19.5 km/s
Diameter · ≈
0.05 km
TJ
6.5
Eccentricity · e
0.4432

Orbit and dynamics

Between its closest point (0.504 AU) and its farthest (1.305 AU), the heliocentric distance changes by 0.801 AU over every revolution.

One full revolution takes 0.86 yr (314 days), computed from the semi-major axis of 0.904 AU.

The high eccentricity (0.443) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 4.1° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 50.4 km/s at perihelion and falls to 19.5 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 = 24.09 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 72 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5566 arcseconds.

Condition code U = 2 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
0.9044 AU
Eccentricity
0.4432
Perihelion
0.504 AU
Aphelion
1.30523 AU
Inclination
4.1°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
147.75°

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
2028-Nov-15 03:20 0.143529 AU
21471594 km
10.18 km/s
2030-Feb-12 15:21 0.217944 AU
32603935 km
9.75 km/s
2034-Nov-13 16:02 0.069916 AU
10459314 km
13.24 km/s
2036-Jan-30 11:12 0.279659 AU
41836422 km
10.33 km/s
2036-Apr-22 05:37 0.376865 AU
56378163 km
10.13 km/s
2037-Feb-09 17:53 0.469473 AU
70232126 km
28.71 km/s
2040-Nov-16 02:09 0.123517 AU
18477844 km
16.77 km/s
2041-Aug-04 15:53 0.491547 AU
73534417 km
19.38 km/s
2042-Jan-18 12:36 0.312928 AU
46813394 km
10.73 km/s
2042-May-10 03:32 0.429051 AU
64185042 km
14.05 km/s
2043-Feb-14 22:45 0.360408 AU
53916314 km
25.08 km/s
2046-Nov-20 14:03 0.224145 AU
33531679 km
20.27 km/s
2047-Aug-16 19:15 0.470229 AU
70345324 km
17.67 km/s
2048-Jan-08 12:25 0.326404 AU
48829393 km
10.88 km/s
2048-May-23 00:18 0.463693 AU
69367445 km
16.72 km/s
2049-Feb-18 18:19 0.253295 AU
37892447 km
21.61 km/s
2052-Nov-24 06:38 0.325094 AU
48633326 km
23.67 km/s
2053-Aug-28 05:18 0.441658 AU
66071094 km
15.53 km/s
2053-Dec-29 05:01 0.323034 AU
48325228 km
10.80 km/s
2054-Jun-03 18:51 0.486417 AU
72766885 km
18.58 km/s
2055-Feb-23 01:07 0.151796 AU
22708391 km
18.38 km/s
2058-Nov-28 19:21 0.416876 AU
62363749 km
26.72 km/s
2059-Sep-10 00:30 0.406561 AU
60820659 km
12.96 km/s
2059-Dec-20 11:02 0.306363 AU
45831201 km
10.54 km/s
2061-Feb-25 09:20 0.059655 AU
8924275 km
15.47 km/s
2064-Dec-01 15:27 0.490585 AU
73390443 km
29.20 km/s
2065-Sep-21 14:37 0.369463 AU
55270915 km
10.31 km/s
2065-Dec-12 04:05 0.282862 AU
42315605 km
10.21 km/s
2067-Feb-27 06:46 0.010997 AU
1645152 km
13.39 km/s
2071-Nov-25 07:34 0.210748 AU
31527433 km
9.54 km/s
2073-Feb-21 16:13 0.158683 AU
23738574 km
9.86 km/s
2077-Nov-13 02:15 0.087979 AU
13161475 km
11.93 km/s
2079-Feb-03 06:37 0.264439 AU
39559574 km
10.15 km/s
2079-Apr-14 19:31 0.353832 AU
52932478 km
8.19 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
24.09

Orbit Quality

RMS
0.55662
Condition
2
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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