SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 FH38

2012 FH38

2012 FH38 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.549 AU it takes 1.93 yr to circle the Sun.

Apollo Observations: 95
Orbital Period · P
1.93 yr
v(q)
46.9 km/s
v(Q)
12.2 km/s
Diameter · ≈
0.16 km
TJ
4.23
Eccentricity · e
0.5863

Orbit and dynamics

The path is an ellipse reaching 0.641 AU from the Sun at perihelion and 2.457 AU at aphelion, a radial span of 1.816 AU.

Applying Kepler's third law to a = 1.549 AU gives an orbital period of 1.93 yr, or about 704 days.

The high eccentricity (0.586) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 8.56° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 46.9 km/s at perihelion and falls to 12.2 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 = 21.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

The current orbit solution is based on 95 observations and has a weighted RMS residual of 0.5981 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
1.549 AU
Eccentricity
0.5863
Perihelion
0.641 AU
Aphelion
2.457179 AU
Inclination
8.56°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
166.97°

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
2037-Mar-27 12:18 0.442852 AU
66249687 km
30.39 km/s
2039-Mar-04 03:59 0.051630 AU
7723739 km
17.23 km/s
2040-Dec-30 21:43 0.336383 AU
50322123 km
15.83 km/s
2042-Oct-30 05:19 0.316075 AU
47284211 km
13.47 km/s
2044-Sep-04 15:03 0.111940 AU
16745941 km
20.05 km/s
2064-Mar-21 23:16 0.335109 AU
50131555 km
27.11 km/s
2066-Feb-22 11:37 0.136091 AU
20358939 km
13.89 km/s
2067-Dec-15 17:32 0.357807 AU
53527117 km
16.74 km/s
2069-Sep-30 01:24 0.229423 AU
34321260 km
11.18 km/s
2071-Aug-29 15:02 0.240696 AU
36007602 km
24.09 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
21.7

Orbit Quality

RMS
0.59815
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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