SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 MJ8

2017 MJ8

2017 MJ8 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.408 AU it takes 1.67 yr to circle the Sun.

Apollo Observations: 42
Orbital Period · P
1.67 yr
v(q)
50.4 km/s
v(Q)
12.5 km/s
Diameter · ≈
0.25 km
TJ
4.51
Eccentricity · e
0.6023

Orbit and dynamics

Between its closest point (0.56 AU) and its farthest (2.256 AU), the heliocentric distance changes by 1.696 AU over every revolution.

One full revolution takes 1.67 yr (610 days), computed from the semi-major axis of 1.408 AU.

The high eccentricity (0.602) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 9.86° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 50.4 km/s at perihelion and falls to 12.5 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 = 20.75 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.25 km.

Observation record and orbit quality

Astrometry from 42 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6728 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
1.408 AU
Eccentricity
0.6023
Perihelion
0.56 AU
Aphelion
2.256038 AU
Inclination
9.86°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
182.03°

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-May-23 15:56 0.233850 AU
34983398 km
14.08 km/s
2032-May-31 17:02 0.182135 AU
27246972 km
16.24 km/s
2037-Jun-07 05:46 0.162519 AU
24312496 km
18.77 km/s
2038-Nov-01 06:20 0.429821 AU
64300354 km
31.09 km/s
2042-Jun-12 22:46 0.189606 AU
28364685 km
21.43 km/s
2043-Nov-05 19:46 0.344810 AU
51582812 km
28.30 km/s
2047-Jun-18 09:02 0.252058 AU
37707308 km
24.22 km/s
2048-Nov-09 14:03 0.258439 AU
38661859 km
25.35 km/s
2052-Jun-22 12:08 0.328155 AU
49091257 km
26.97 km/s
2053-Nov-14 10:09 0.180743 AU
27038817 km
22.38 km/s
2057-Jun-27 09:47 0.408377 AU
61092283 km
29.67 km/s
2058-Nov-19 05:10 0.134749 AU
20158141 km
19.47 km/s
2062-Jul-02 02:44 0.490169 AU
73328206 km
32.33 km/s
2063-Nov-23 21:20 0.147721 AU
22098793 km
16.70 km/s
2068-Nov-28 03:25 0.208917 AU
31253484 km
13.84 km/s
2073-Dec-08 19:23 0.291375 AU
43589144 km
10.87 km/s
2079-Jan-05 18:03 0.355145 AU
53128868 km
14.01 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
20.75

Orbit Quality

RMS
0.67283
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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