SpaceAtlas Space Object Data
NASA JPL SBDB · 2001 TC45

2001 TC45

2001 TC45 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.218 AU it takes 3.30 yr to circle the Sun.

Apollo Observations: 222
Orbital Period · P
3.30 yr
v(q)
42.9 km/s
v(Q)
9.3 km/s
Diameter · ≈
0.47 km
TJ
3.31
Eccentricity · e
0.6428

Orbit and dynamics

Between its closest point (0.792 AU) and its farthest (3.644 AU), the heliocentric distance changes by 2.852 AU over every revolution.

One full revolution takes 3.30 yr (1,207 days), computed from the semi-major axis of 2.218 AU.

The high eccentricity (0.643) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 15.47° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 42.9 km/s at perihelion and falls to 9.3 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 = 19.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.47 km.

Observation record and orbit quality

Astrometry from 222 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5831 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
2.218 AU
Eccentricity
0.6428
Perihelion
0.792 AU
Aphelion
3.64373 AU
Inclination
15.47°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
145.38°

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
2044-Oct-27 03:58 0.081438 AU
12182921 km
19.33 km/s
2077-Oct-30 20:04 0.041504 AU
6208970 km
17.97 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
19.4

Orbit Quality

RMS
0.5831
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.

Keep exploring

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