SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 UD1

2017 UD1

2017 UD1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.13 AU it takes 1.20 yr to circle the Sun.

Apollo Observations: 62
Orbital Period · P
1.20 yr
v(q)
32.7 km/s
v(Q)
24 km/s
Diameter · ≈
0.04 km
TJ
5.46
Eccentricity · e
0.1545

Orbit and dynamics

Between its closest point (0.956 AU) and its farthest (1.305 AU), the heliocentric distance changes by 0.349 AU over every revolution.

One full revolution takes 1.20 yr (439 days), computed from the semi-major axis of 1.13 AU.

An eccentricity of 0.154 makes the orbit moderately elongated.

A steep inclination of 22.21° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 32.7 km/s at perihelion and falls to 24 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 = 24.79 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 62 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4616 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
1.13 AU
Eccentricity
0.1545
Perihelion
0.956 AU
Aphelion
1.304585 AU
Inclination
22.21°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
7.18°

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-Oct-17 23:05 0.126196 AU
18878698 km
11.42 km/s
2030-Apr-05 07:37 0.120338 AU
18002359 km
12.09 km/s
2035-Oct-17 12:48 0.175152 AU
26202342 km
11.34 km/s
2036-Apr-04 05:14 0.143867 AU
21522242 km
12.71 km/s
2041-Oct-14 21:10 0.240477 AU
35974786 km
11.45 km/s
2042-Apr-04 13:54 0.193922 AU
29010255 km
13.71 km/s
2047-Oct-11 03:02 0.317318 AU
47470099 km
11.73 km/s
2048-Apr-04 14:32 0.265949 AU
39785417 km
15.17 km/s
2053-Oct-02 22:16 0.399002 AU
59689887 km
11.91 km/s
2054-Apr-06 08:50 0.352044 AU
52665005 km
17.09 km/s
2059-Sep-18 14:36 0.478344 AU
71559175 km
11.30 km/s
2060-Apr-08 00:14 0.446903 AU
66855792 km
19.38 km/s
2071-May-17 05:52 0.478659 AU
71606398 km
10.40 km/s
2076-Oct-10 15:44 0.410983 AU
61482221 km
19.08 km/s
2077-May-02 07:53 0.414785 AU
62050892 km
11.22 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
24.79

Orbit Quality

RMS
0.4616
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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