SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 JR1

2015 JR1

2015 JR1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.94 AU and a period of 0.91 yr.

Aten Observations: 28
Orbital Period · P
0.91 yr
v(q)
36.5 km/s
v(Q)
25.8 km/s
Diameter · ≈
0.02 km
TJ
6.36
Eccentricity · e
0.1713

Orbit and dynamics

Between its closest point (0.779 AU) and its farthest (1.101 AU), the heliocentric distance changes by 0.322 AU over every revolution.

One full revolution takes 0.91 yr (333 days), computed from the semi-major axis of 0.94 AU.

An eccentricity of 0.171 makes the orbit moderately elongated.

The orbital plane is tilted 11.95° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36.5 km/s at perihelion and falls to 25.8 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 = 26.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 28 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7093 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
0.9399 AU
Eccentricity
0.1713
Perihelion
0.779 AU
Aphelion
1.100905 AU
Inclination
11.95°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
178.67°

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
2035-May-08 13:53 0.182321 AU
27274801 km
11.37 km/s
2036-Jan-05 11:50 0.253907 AU
37983973 km
7.67 km/s
2036-Sep-25 12:11 0.175567 AU
26264396 km
8.54 km/s
2045-May-11 13:55 0.293212 AU
43863848 km
14.37 km/s
2046-Feb-05 10:48 0.257508 AU
38522633 km
5.36 km/s
2046-Jun-13 11:03 0.191673 AU
28673814 km
6.30 km/s
2046-Oct-15 21:48 0.151208 AU
22620402 km
8.00 km/s
2055-May-16 09:49 0.404979 AU
60583978 km
17.54 km/s
2056-May-17 17:52 0.109682 AU
16408191 km
6.34 km/s
2056-Nov-04 07:06 0.165071 AU
24694233 km
8.20 km/s
2057-Aug-22 10:16 0.405683 AU
60689367 km
15.67 km/s
2065-May-19 02:21 0.485225 AU
72588667 km
19.84 km/s
2066-May-09 10:44 0.041427 AU
6197394 km
6.68 km/s
2066-Nov-18 14:28 0.187746 AU
28086388 km
8.45 km/s
2067-Aug-27 14:15 0.345121 AU
51629305 km
13.66 km/s
2076-May-07 16:26 0.025026 AU
3743854 km
6.94 km/s
2076-Nov-20 19:41 0.191744 AU
28684458 km
8.52 km/s
2077-Aug-26 22:58 0.335534 AU
50195123 km
13.39 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
26.1

Orbit Quality

RMS
0.7093
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.

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