SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 NO1

2021 NO1

2021 NO1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.956 AU and a period of 0.93 yr.

Aten Observations: 17
Orbital Period · P
0.93 yr
v(q)
33.7 km/s
v(Q)
27.6 km/s
Diameter · ≈
0.03 km
TJ
6.25
Eccentricity · e
0.0997

Orbit and dynamics

Between its closest point (0.86 AU) and its farthest (1.051 AU), the heliocentric distance changes by 0.191 AU over every revolution.

One full revolution takes 0.93 yr (341 days), computed from the semi-major axis of 0.956 AU.

With e = 0.1, the orbit is close to circular.

The orbital plane is tilted 18.79° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.7 km/s at perihelion and falls to 27.6 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 = 25.08 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 17 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5309 arcseconds.

Condition code U = 8 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
0.9557 AU
Eccentricity
0.0997
Perihelion
0.86 AU
Aphelion
1.050983 AU
Inclination
18.79°
Orbital Period
— yr
Epoch
2459403.5
Mean Anomaly
149.36°

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
2034-Jul-07 04:09 0.250932 AU
37538846 km
19.09 km/s
2035-Jun-29 05:10 0.026510 AU
3965780 km
10.66 km/s
2077-Jul-03 05:31 0.102074 AU
15270099 km
15.60 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
25.08

Orbit Quality

RMS
0.53087
Condition
8
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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