SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 XT378

2015 XT378

2015 XT378 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.937 AU and a period of 0.91 yr.

Aten Observations: 12
Orbital Period · P
0.91 yr
v(q)
39 km/s
v(Q)
24.3 km/s
Diameter · ≈
0.01 km
TJ
6.37
Eccentricity · e
0.2336

Orbit and dynamics

Between its closest point (0.718 AU) and its farthest (1.156 AU), the heliocentric distance changes by 0.438 AU over every revolution.

One full revolution takes 0.91 yr (331 days), computed from the semi-major axis of 0.937 AU.

An eccentricity of 0.234 makes the orbit moderately elongated.

The orbital plane is tilted 5.69° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 39 km/s at perihelion and falls to 24.3 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 = 27.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 12 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6891 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
0.9371 AU
Eccentricity
0.2336
Perihelion
0.718 AU
Aphelion
1.156007 AU
Inclination
5.69°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
293.4°

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
2027-Apr-16 15:51 0.085397 AU
12775250 km
8.61 km/s
2034-Dec-19 17:53 0.309611 AU
46317075 km
17.11 km/s
2035-Oct-10 08:14 0.242106 AU
36218613 km
6.54 km/s
2036-Jan-26 09:07 0.181958 AU
27220515 km
6.04 km/s
2036-Jul-05 01:35 0.269686 AU
40344413 km
8.66 km/s
2037-Apr-09 15:26 0.202951 AU
30361041 km
13.25 km/s
2044-Dec-13 14:56 0.158684 AU
23738786 km
12.49 km/s
2045-Sep-10 22:32 0.287441 AU
43000494 km
8.78 km/s
2046-Feb-27 15:56 0.186840 AU
27950864 km
5.75 km/s
2046-Jun-06 12:55 0.214339 AU
32064592 km
6.54 km/s
2047-Apr-03 23:05 0.344169 AU
51486920 km
17.70 km/s
2054-Dec-10 07:19 0.013422 AU
2007854 km
8.24 km/s
2055-Aug-22 14:12 0.300155 AU
44902504 km
9.55 km/s
2056-Apr-11 02:45 0.136270 AU
20385715 km
4.36 km/s
2057-Apr-01 00:58 0.412933 AU
61773921 km
20.24 km/s
2064-Dec-12 15:24 0.067849 AU
10150071 km
11.61 km/s
2067-Apr-06 08:45 0.240557 AU
35986769 km
16.80 km/s
2074-Dec-17 13:44 0.146196 AU
21870638 km
15.35 km/s
2077-Apr-11 05:12 0.099272 AU
14850810 km
13.04 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
27.9

Orbit Quality

RMS
0.68909
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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