SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 XF261

2015 XF261

2015 XF261 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.99 AU and a period of 0.98 yr.

Aten Observations: 73
Orbital Period · P
0.98 yr
v(q)
41.7 km/s
v(Q)
21.5 km/s
Diameter · ≈
0.03 km
TJ
6.08
Eccentricity · e
0.3191

Orbit and dynamics

Between its closest point (0.674 AU) and its farthest (1.306 AU), the heliocentric distance changes by 0.632 AU over every revolution.

One full revolution takes 0.98 yr (360 days), computed from the semi-major axis of 0.99 AU.

An eccentricity of 0.319 makes the orbit moderately elongated.

Its inclination of 0.79° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 41.7 km/s at perihelion and falls to 21.5 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 = 25.25 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 73 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5715 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
0.9899 AU
Eccentricity
0.3191
Perihelion
0.674 AU
Aphelion
1.305777 AU
Inclination
0.79°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
326.41°

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 04:00 0.213489 AU
31937565 km
6.80 km/s
2027-May-21 06:15 0.233417 AU
34918691 km
6.50 km/s
2028-Apr-06 12:29 0.140509 AU
21019778 km
6.37 km/s
2029-Apr-10 22:07 0.044615 AU
6674265 km
8.76 km/s
2030-Apr-08 18:49 0.047015 AU
7033281 km
11.46 km/s
2031-Apr-05 10:41 0.145148 AU
21713810 km
14.44 km/s
2032-Mar-31 17:46 0.244268 AU
36541990 km
17.49 km/s
2033-Mar-27 21:48 0.343422 AU
51375211 km
20.56 km/s
2034-Mar-23 17:05 0.447453 AU
66937976 km
23.79 km/s
2069-Dec-08 16:22 0.428978 AU
64174219 km
23.36 km/s
2070-Dec-04 11:55 0.324754 AU
48582453 km
20.08 km/s
2071-Nov-30 09:59 0.219562 AU
32845976 km
16.80 km/s
2072-Nov-25 13:17 0.114059 AU
17062923 km
13.52 km/s
2073-Nov-22 07:11 0.012235 AU
1830344 km
10.37 km/s
2074-Nov-21 02:24 0.069600 AU
10411990 km
8.01 km/s
2075-Nov-27 03:55 0.146650 AU
21938536 km
6.28 km/s
2076-Oct-13 02:02 0.228310 AU
34154725 km
6.52 km/s
2076-Dec-12 09:12 0.209683 AU
31368059 km
6.78 km/s
2077-Sep-24 16:24 0.271979 AU
40687516 km
8.77 km/s
2077-Dec-25 07:07 0.254328 AU
38046988 km
7.54 km/s
2078-Sep-10 21:31 0.301247 AU
45065875 km
10.27 km/s
2079-Jan-05 03:00 0.285651 AU
42732772 km
8.12 km/s
2079-Aug-29 18:34 0.320939 AU
48011852 km
11.30 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
25.25

Orbit Quality

RMS
0.57151
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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