SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 HA1

2015 HA1

2015 HA1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.964 AU and a period of 0.95 yr.

Aten Observations: 439
Orbital Period · P
0.95 yr
v(q)
36.7 km/s
v(Q)
25.1 km/s
Diameter · ≈
0.21 km
TJ
6.19
Eccentricity · e
0.1883

Orbit and dynamics

Between its closest point (0.783 AU) and its farthest (1.146 AU), the heliocentric distance changes by 0.363 AU over every revolution.

One full revolution takes 0.95 yr (346 days), computed from the semi-major axis of 0.964 AU.

An eccentricity of 0.188 makes the orbit moderately elongated.

The orbital plane is tilted 19.87° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36.7 km/s at perihelion and falls to 25.1 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 = 21.18 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.21 km.

Observation record and orbit quality

Astrometry from 439 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3133 arcseconds.

Condition code U = 2 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
0.9642 AU
Eccentricity
0.1883
Perihelion
0.783 AU
Aphelion
1.145759 AU
Inclination
19.87°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
123.52°

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
2030-Dec-22 14:51 0.241515 AU
36130132 km
14.73 km/s
2031-Nov-16 14:58 0.183464 AU
27445760 km
12.37 km/s
2032-May-03 03:21 0.268331 AU
40141735 km
10.25 km/s
2032-Sep-25 09:19 0.345656 AU
51709465 km
10.95 km/s
2033-May-22 14:55 0.056269 AU
8417716 km
11.19 km/s
2034-May-19 18:01 0.322522 AU
48248601 km
17.51 km/s
2048-Jan-11 15:37 0.422894 AU
63264018 km
19.22 km/s
2048-Dec-12 04:13 0.183435 AU
27441433 km
13.46 km/s
2049-Nov-02 16:28 0.232289 AU
34749883 km
12.36 km/s
2050-May-13 05:09 0.192432 AU
28787471 km
10.11 km/s
2051-May-23 13:43 0.119298 AU
17846677 km
12.70 km/s
2052-May-16 09:35 0.420543 AU
62912307 km
20.13 km/s
2065-Dec-31 22:37 0.317910 AU
47558725 km
16.50 km/s
2066-Nov-28 09:46 0.158463 AU
23705697 km
12.59 km/s
2067-Apr-20 14:25 0.330681 AU
49469227 km
10.21 km/s
2067-Oct-14 06:02 0.301847 AU
45155708 km
12.07 km/s
2068-May-20 03:37 0.090158 AU
13487480 km
10.38 km/s
2069-May-21 12:50 0.238484 AU
35676650 km
15.40 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
21.18

Orbit Quality

RMS
0.31332
Condition
2
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.