SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 PK9

2015 PK9

2015 PK9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.207 AU it takes 1.33 yr to circle the Sun.

Apollo Observations: 274
Orbital Period · P
1.33 yr
v(q)
34.4 km/s
v(Q)
21.4 km/s
Diameter · ≈
0.06 km
TJ
5.23
Eccentricity · e
0.2343

Orbit and dynamics

Between its closest point (0.924 AU) and its farthest (1.49 AU), the heliocentric distance changes by 0.566 AU over every revolution.

One full revolution takes 1.33 yr (484 days), computed from the semi-major axis of 1.207 AU.

An eccentricity of 0.234 makes the orbit moderately elongated.

The orbital plane is tilted 11.13° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.4 km/s at perihelion and falls to 21.4 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 = 23.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

Astrometry from 274 individual observations underpins this orbit; the fit leaves an RMS residual of 0.26 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
1.207 AU
Eccentricity
0.2343
Perihelion
0.924 AU
Aphelion
1.4898 AU
Inclination
11.13°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
100.44°

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-Mar-20 04:12 0.156826 AU
23460780 km
8.37 km/s
2027-Sep-16 06:44 0.368491 AU
55125486 km
5.65 km/s
2031-Mar-18 08:57 0.220979 AU
33057983 km
11.87 km/s
2031-Oct-10 00:22 0.441364 AU
66027096 km
6.65 km/s
2035-Mar-13 17:47 0.341956 AU
51155844 km
15.95 km/s
2035-Oct-26 19:25 0.491580 AU
73539356 km
7.54 km/s
2039-Mar-08 03:28 0.480761 AU
71920830 km
20.27 km/s
2060-Jan-06 20:44 0.485656 AU
72653090 km
9.21 km/s
2060-Aug-30 07:20 0.445234 AU
66606123 km
20.05 km/s
2064-Jan-18 08:59 0.442575 AU
66208290 km
8.89 km/s
2064-Aug-23 06:37 0.298164 AU
44604627 km
15.97 km/s
2068-Jan-30 10:18 0.389264 AU
58233011 km
8.40 km/s
2068-Aug-15 21:54 0.154415 AU
23100223 km
12.15 km/s
2072-Feb-11 20:37 0.329353 AU
49270472 km
7.76 km/s
2072-Aug-07 16:40 0.023879 AU
3572260 km
8.97 km/s
2076-Feb-18 15:02 0.299890 AU
44862850 km
7.40 km/s
2076-Aug-02 23:45 0.036663 AU
5484754 km
7.84 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
23.7

Orbit Quality

RMS
0.25998
Condition
0
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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