SpaceAtlas Space Object Data
NASA JPL SBDB · 2016 HJ19

2016 HJ19

2016 HJ19 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.979 AU and a period of 0.97 yr.

Aten Observations: 117
Orbital Period · P
0.97 yr
v(q)
40.8 km/s
v(Q)
22.2 km/s
Diameter · ≈
0.26 km
TJ
5.99
Eccentricity · e
0.2941

Orbit and dynamics

Between its closest point (0.691 AU) and its farthest (1.267 AU), the heliocentric distance changes by 0.576 AU over every revolution.

One full revolution takes 0.97 yr (354 days), computed from the semi-major axis of 0.979 AU.

An eccentricity of 0.294 makes the orbit moderately elongated.

A steep inclination of 36.3° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 40.8 km/s at perihelion and falls to 22.2 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 = 20.68 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.26 km.

Observation record and orbit quality

Astrometry from 117 individual observations underpins this orbit; the fit leaves an RMS residual of 0.57 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
0.9787 AU
Eccentricity
0.2941
Perihelion
0.691 AU
Aphelion
1.266536 AU
Inclination
36.3°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
299.46°

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
2045-Apr-15 06:42 0.474516 AU
70986591 km
21.85 km/s
2046-Apr-17 10:23 0.365374 AU
54659123 km
19.57 km/s
2046-Dec-17 09:52 0.490984 AU
73450185 km
24.13 km/s
2047-Apr-21 06:59 0.285401 AU
42695402 km
18.28 km/s
2047-Nov-29 07:03 0.390025 AU
58346902 km
24.36 km/s
2048-Apr-25 02:38 0.249679 AU
37351440 km
17.68 km/s
2048-Nov-11 17:25 0.316962 AU
47416820 km
24.23 km/s
2049-Apr-30 11:50 0.266127 AU
39812008 km
17.59 km/s
2049-Oct-26 16:08 0.302003 AU
45178967 km
24.23 km/s
2050-May-06 03:49 0.322117 AU
48188064 km
17.82 km/s
2050-Oct-10 13:14 0.354024 AU
52961175 km
24.46 km/s
2051-May-12 00:55 0.400114 AU
59856185 km
18.42 km/s
2051-Sep-23 17:44 0.448426 AU
67083505 km
24.77 km/s
2052-May-16 22:27 0.491335 AU
73502702 km
19.44 km/s
2076-Apr-16 07:37 0.394549 AU
59023703 km
20.13 km/s
2077-Apr-19 18:56 0.303665 AU
45427658 km
18.56 km/s
2077-Dec-03 17:15 0.416222 AU
62265888 km
24.37 km/s
2078-Apr-24 09:43 0.254112 AU
38014628 km
17.79 km/s
2078-Nov-16 19:48 0.332346 AU
49718235 km
24.27 km/s
2079-Apr-29 16:19 0.256899 AU
38431596 km
17.58 km/s
2079-Oct-31 15:29 0.299047 AU
44736800 km
24.21 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
20.68

Orbit Quality

RMS
0.56998
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.

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