SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 UC45

2017 UC45

2017 UC45 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.632 AU it takes 2.08 yr to circle the Sun.

Apollo Observations: 59
Orbital Period · P
2.08 yr
v(q)
43.1 km/s
v(Q)
12.6 km/s
Diameter · ≈
0.14 km
TJ
4.12
Eccentricity · e
0.5473

Orbit and dynamics

Between its closest point (0.739 AU) and its farthest (2.525 AU), the heliocentric distance changes by 1.786 AU over every revolution.

One full revolution takes 2.08 yr (762 days), computed from the semi-major axis of 1.632 AU.

The high eccentricity (0.547) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.79° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 43.1 km/s at perihelion and falls to 12.6 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 = 22.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.14 km.

Observation record and orbit quality

Astrometry from 59 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5121 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
1.632 AU
Eccentricity
0.5473
Perihelion
0.739 AU
Aphelion
2.525194 AU
Inclination
5.79°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
6.52°

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
2040-Nov-14 23:59 0.296714 AU
44387728 km
23.31 km/s
2043-Jan-07 18:00 0.200387 AU
29977464 km
11.72 km/s
2045-Apr-13 19:55 0.157078 AU
23498478 km
10.99 km/s
2047-May-21 12:53 0.401027 AU
59992811 km
26.01 km/s
2065-Nov-18 22:00 0.233415 AU
34918431 km
21.41 km/s
2068-Jan-22 17:32 0.232491 AU
34780184 km
12.63 km/s
2070-Apr-26 17:19 0.096498 AU
14435888 km
13.59 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
22.1

Orbit Quality

RMS
0.51209
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.