SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 FP

2021 FP

2021 FP is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.759 AU and a period of 0.66 yr.

Aten Observations: 69
Orbital Period · P
0.66 yr
v(q)
63.4 km/s
v(Q)
18.4 km/s
Diameter · ≈
0.1 km
TJ
7.34
Eccentricity · e
0.5493

Orbit and dynamics

Between its closest point (0.342 AU) and its farthest (1.176 AU), the heliocentric distance changes by 0.834 AU over every revolution.

One full revolution takes 0.66 yr (242 days), computed from the semi-major axis of 0.759 AU.

The high eccentricity (0.549) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 40.28° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 63.4 km/s at perihelion and falls to 18.4 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 = 22.84 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.1 km.

Observation record and orbit quality

Astrometry from 69 individual observations underpins this orbit; the fit leaves an RMS residual of 0.549 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
0.7591 AU
Eccentricity
0.5493
Perihelion
0.342 AU
Aphelion
1.176074 AU
Inclination
40.28°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
177.31°

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-24 05:20 0.220530 AU
32990771 km
23.27 km/s
2029-Mar-23 03:42 0.274616 AU
41081905 km
24.95 km/s
2031-Mar-22 08:25 0.337472 AU
50485050 km
26.97 km/s
2033-Mar-19 22:06 0.405377 AU
60643595 km
29.21 km/s
2035-Mar-18 01:06 0.476011 AU
71210286 km
31.62 km/s
2044-Mar-01 16:24 0.455215 AU
68099172 km
24.88 km/s
2046-Mar-02 14:12 0.407042 AU
60892550 km
23.22 km/s
2048-Mar-03 09:02 0.363681 AU
54405893 km
21.95 km/s
2050-Mar-05 20:01 0.324720 AU
48577451 km
21.05 km/s
2052-Mar-07 17:44 0.289252 AU
43271530 km
20.46 km/s
2054-Mar-10 21:35 0.256209 AU
38328384 km
20.09 km/s
2056-Mar-13 03:46 0.224851 AU
33637189 km
19.89 km/s
2058-Mar-16 09:09 0.195599 AU
29261181 km
19.84 km/s
2060-Mar-18 09:08 0.170770 AU
25546885 km
19.95 km/s
2062-Mar-21 00:54 0.154972 AU
23183537 km
20.28 km/s
2064-Mar-22 05:52 0.154552 AU
23120705 km
20.87 km/s
2066-Mar-23 20:30 0.174348 AU
26082079 km
21.77 km/s
2068-Mar-23 16:57 0.212714 AU
31821492 km
23.01 km/s
2070-Mar-23 19:03 0.264438 AU
39559360 km
24.60 km/s
2072-Mar-22 03:32 0.325054 AU
48627436 km
26.53 km/s
2074-Mar-20 20:17 0.391771 AU
58608137 km
28.74 km/s
2076-Mar-18 00:52 0.462057 AU
69122739 km
31.11 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
22.84

Orbit Quality

RMS
0.54895
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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