SpaceAtlas Space Object Data
NASA JPL SBDB · 1999 FN19

1999 FN19

1999 FN19 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.648 AU it takes 2.12 yr to circle the Sun.

Apollo Observations: 351
Orbital Period · P
2.12 yr
v(q)
35.1 km/s
v(Q)
15.3 km/s
Diameter · ≈
0.11 km
TJ
4.19
Eccentricity · e
0.3915

Orbit and dynamics

The path is an ellipse reaching 1.003 AU from the Sun at perihelion and 2.293 AU at aphelion, a radial span of 1.29 AU.

Applying Kepler's third law to a = 1.648 AU gives an orbital period of 2.12 yr, or about 773 days.

An eccentricity of 0.392 makes the orbit moderately elongated.

Its inclination of 2.26° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35.1 km/s at perihelion and falls to 15.3 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 22.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.11 km.

Observation record and orbit quality

The current orbit solution is based on 351 observations and has a weighted RMS residual of 0.4329 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
1.648 AU
Eccentricity
0.3915
Perihelion
1.003 AU
Aphelion
2.293192 AU
Inclination
2.26°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
296.83°

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
2035-Mar-09 19:21 0.457608 AU
68457231 km
19.96 km/s
2037-Jun-20 10:50 0.126217 AU
18881785 km
9.73 km/s
2054-Mar-25 23:12 0.180913 AU
27064160 km
11.71 km/s
2056-Jul-09 11:30 0.389975 AU
58339500 km
17.75 km/s
2073-Apr-30 16:22 0.020433 AU
3056701 km
5.79 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
22.5

Orbit Quality

RMS
0.43285
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.

Keep exploring

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