SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 BD77

2009 BD77

2009 BD77 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.054 AU it takes 1.08 yr to circle the Sun.

Apollo Observations: 344
Orbital Period · P
1.08 yr
v(q)
36.3 km/s
v(Q)
23.2 km/s
Diameter · ≈
0.3 km
TJ
5.78
Eccentricity · e
0.2199

Orbit and dynamics

Between its closest point (0.823 AU) and its farthest (1.286 AU), the heliocentric distance changes by 0.463 AU over every revolution.

One full revolution takes 1.08 yr (395 days), computed from the semi-major axis of 1.054 AU.

An eccentricity of 0.22 makes the orbit moderately elongated.

The orbital plane is tilted 17.47° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36.3 km/s at perihelion and falls to 23.2 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 = 20.38 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.3 km.

Observation record and orbit quality

Astrometry from 344 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5063 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
1.054 AU
Eccentricity
0.2199
Perihelion
0.823 AU
Aphelion
1.285775 AU
Inclination
17.47°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
79.1°

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
2033-Aug-15 20:08 0.113123 AU
16923019 km
12.32 km/s
2034-Apr-29 07:34 0.422567 AU
63215109 km
7.72 km/s
2035-Feb-24 15:02 0.174607 AU
26120812 km
9.51 km/s
2036-Feb-20 11:10 0.348347 AU
52111931 km
18.27 km/s
2046-Aug-11 06:22 0.157376 AU
23543067 km
13.40 km/s
2047-May-14 17:15 0.428147 AU
64049852 km
6.70 km/s
2047-Oct-27 14:24 0.299857 AU
44857950 km
9.19 km/s
2048-Mar-01 01:53 0.216620 AU
32405845 km
9.44 km/s
2049-Feb-18 02:11 0.289343 AU
43285091 km
16.63 km/s
2059-Aug-05 12:33 0.228809 AU
34229279 km
15.15 km/s
2060-Oct-04 06:57 0.252262 AU
37737861 km
10.06 km/s
2061-Mar-09 20:51 0.272037 AU
40696191 km
9.45 km/s
2062-Feb-16 12:24 0.210953 AU
31558157 km
14.51 km/s
2072-Jul-30 13:49 0.300825 AU
45002729 km
16.96 km/s
2073-Sep-19 06:42 0.198125 AU
29639078 km
10.11 km/s
2074-Mar-18 19:33 0.317231 AU
47457073 km
9.41 km/s
2075-Feb-15 20:42 0.149726 AU
22398681 km
12.83 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
20.38

Orbit Quality

RMS
0.50626
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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