SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 HH49

2017 HH49

2017 HH49 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.658 AU it takes 2.13 yr to circle the Sun.

Apollo Observations: 46
Orbital Period · P
2.13 yr
v(q)
36.3 km/s
v(Q)
14.7 km/s
Diameter · ≈
0.11 km
TJ
4.08
Eccentricity · e
0.4219

Orbit and dynamics

Between its closest point (0.958 AU) and its farthest (2.358 AU), the heliocentric distance changes by 1.4 AU over every revolution.

One full revolution takes 2.13 yr (780 days), computed from the semi-major axis of 1.658 AU.

The high eccentricity (0.422) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 22.92° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 36.3 km/s at perihelion and falls to 14.7 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 = 22.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.11 km.

Observation record and orbit quality

Astrometry from 46 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4268 arcseconds.

Condition code U = 5 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.658 AU
Eccentricity
0.4219
Perihelion
0.958 AU
Aphelion
2.35751 AU
Inclination
22.92°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
57.49°

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
2032-May-10 19:26 0.303917 AU
45465272 km
19.71 km/s
2034-Oct-10 08:41 0.369974 AU
55347311 km
20.53 km/s
2049-May-17 23:04 0.305657 AU
45725668 km
12.09 km/s
2049-Oct-03 23:00 0.270464 AU
40460841 km
13.44 km/s
2064-May-14 04:07 0.232829 AU
34830697 km
17.35 km/s
2064-Oct-14 02:26 0.480220 AU
71839842 km
11.98 km/s
2066-Oct-13 20:31 0.440511 AU
65899566 km
23.12 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
22.5

Orbit Quality

RMS
0.42678
Condition
5
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.