SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 HR49

2017 HR49

2017 HR49 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.34 AU once every 3.58 yr.

Amor Observations: 76
Orbital Period · P
3.58 yr
v(q)
32.4 km/s
v(Q)
11.7 km/s
Diameter · ≈
0.57 km
TJ
3.4
Eccentricity · e
0.4705

Orbit and dynamics

Between its closest point (1.239 AU) and its farthest (3.441 AU), the heliocentric distance changes by 2.202 AU over every revolution.

One full revolution takes 3.58 yr (1,307 days), computed from the semi-major axis of 2.34 AU.

The high eccentricity (0.47) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 8.09° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.4 km/s at perihelion and falls to 11.7 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 18.96 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.57 km.

Observation record and orbit quality

Astrometry from 76 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5796 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
2.34 AU
Eccentricity
0.4705
Perihelion
1.239 AU
Aphelion
3.44097 AU
Inclination
8.09°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
141.22°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
18.96

Orbit Quality

RMS
0.57961
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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