SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 YC29

2011 YC29

2011 YC29 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.23 AU once every 1.36 yr.

Amor Observations: 100
Orbital Period · P
1.36 yr
v(q)
31.5 km/s
v(Q)
22.9 km/s
Diameter · ≈
0.12 km
TJ
5.11
Eccentricity · e
0.1566

Orbit and dynamics

Between its closest point (1.037 AU) and its farthest (1.423 AU), the heliocentric distance changes by 0.386 AU over every revolution.

One full revolution takes 1.36 yr (498 days), computed from the semi-major axis of 1.23 AU.

An eccentricity of 0.157 makes the orbit moderately elongated.

A steep inclination of 23.06° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 31.5 km/s at perihelion and falls to 22.9 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 22.32 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

Astrometry from 100 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4125 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
1.23 AU
Eccentricity
0.1566
Perihelion
1.037 AU
Aphelion
1.422618 AU
Inclination
23.06°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
325.74°

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-Jan-04 22:23 0.361749 AU
54116867 km
12.43 km/s
2030-Jul-15 10:40 0.066737 AU
9983723 km
12.12 km/s
2030-Dec-04 13:11 0.396930 AU
59379948 km
12.27 km/s
2042-Jan-03 05:53 0.356805 AU
53377339 km
12.39 km/s
2045-Jul-16 01:18 0.088145 AU
13186253 km
11.99 km/s
2045-Dec-01 15:39 0.409651 AU
61282848 km
12.28 km/s
2053-Jan-30 09:02 0.489448 AU
73220416 km
12.26 km/s
2056-Jun-30 14:46 0.443732 AU
66381417 km
19.20 km/s
2056-Dec-30 22:27 0.347973 AU
52055956 km
12.35 km/s
2060-Jul-17 07:41 0.148545 AU
22222016 km
11.94 km/s
2060-Nov-24 14:58 0.438653 AU
65621537 km
12.22 km/s
2068-Jan-26 10:20 0.466350 AU
69764929 km
12.40 km/s
2071-Jul-04 14:03 0.356237 AU
53292327 km
17.33 km/s
2071-Dec-27 02:06 0.339929 AU
50852648 km
12.29 km/s
2075-Jul-19 12:49 0.239010 AU
35755337 km
12.32 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
22.32

Orbit Quality

RMS
0.41251
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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