Asteroids

2021GN10 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.912

Aphelion (Q)

3.846

Eccentricity (e)

0.617

Inclination (i)

1.6

deg

Orbit period (P)

1340.3

Earth MOID

0.00176

U parameter

7.3

Next Earth close approach

Date

2032-04-30

Nominal distance (from Earth center)

0.06962

10415271

Maximum Brightness

29.7

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.2

mag

Diameter

6 - 13*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-04-14

Observatory

Pan-STARRS 1, Haleakala

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.378996

1-sigma variation

0.001463

Unit

Eccentricity (e)

Value

0.616756

1-sigma variation

0.000261

Unit

Inclination (i)

Value

1.5625

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

208.0983

1-sigma variation

0.0009

Unit

Arg. of Perihelion (ω)

Value

36.7730

1-sigma variation

0.0018

Unit

Mean Anomaly (M)

Value

136.93070

1-sigma variation

0.46030

Unit

Perihelion distance

Value

0.911737

1-sigma variation

Unit

Aphelion distance

Value

3.846256

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.017783

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.921939

1-sigma variation

Unit

MOID

Value

0.001764

1-sigma variation

Unit

Orbit Period

Value

1340.2600

1-sigma variation

Unit

U parameter

Value

7.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.13997E-6	3.81614E-7	3.43536E-7	1.22140E-6	2.55929E-6	-6.73356E-4
e	3.81614E-7	6.80523E-8	6.12293E-8	2.17922E-7	4.56459E-7	-1.20078E-4
i	3.43536E-7	6.12293E-8	5.90778E-8	1.82724E-7	4.04603E-7	-1.08093E-4
Ω	1.22140E-6	2.17922E-7	1.82724E-7	7.43116E-7	1.48374E-6	-3.84331E-4
ω	2.55929E-6	4.56459E-7	4.04603E-7	1.48374E-6	3.08006E-6	-8.05303E-4
M	-6.73356E-4	-1.20078E-4	-1.08093E-4	-3.84331E-4	-8.05303E-4	2.11876E-1

Date of computation: 2026-06-04 23:11 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

28.236

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

6 - 13*

Unit

Source

[2]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

1.0

Unit

Source

[1]

Unobserved

Value

1877

Unit

Source

[1]

Normalized RMS of residuals

Value

0.445089

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-04-14.275759

Unit

Source

[2]

Last Observation

Value

2021-04-15.2576

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

23 (2)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2021GN10 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1964-05-07 19:04	> 1 mo	0.0719991	0.0063053	0.1297435
EARTH	1989-04-04 10:58	> 1 w	0.0995646	0.0019692	0.0931696
EARTH	1996-07-18 18:21	> 1 w	0.0791154	0.0236623	0.1406717
EARTH	2021-04-15 22:29	< 1 min	0.0019225	0.0019201	0.0000008
EARTH	2032-04-30 16:33	> 1 w	0.0696218	0.0050941	0.0359094
EARTH	2043-06-06 18:03	> 1 w	0.0958664	0.0617603	0.0131560
EARTH	2113-06-16 06:19	> 1 d	0.0734546	0.0661828	0.0024567

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
339.55395996	101.95885184	0.00188436	MINIMUM
21.85010654	186.94348528	0.02729046	MINIMUM
1.06846125	145.13320439	0.10429405	SADDLE
0.80647553	324.60472342	1.89854076	SADDLE
180.20050014	323.81756059	2.85995911	SADDLE
180.19155758	143.81745903	4.86128366	MAXIMUM

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MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2021GN10

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2075-04-17.505	79044.505	-1.509	0.000	1.01 ± 0.002	9.63E5	2.67E-7	1.54E-2	-8.20	0
2116-04-17.126	94019.126	-1.776	0.000	1.31 ± 0.003	3.89E4	4.17E-6	1.57E-2	-7.25	0


Based on 23 optical observations (of which 2 are rejected as outliers) from 2021/04/14.276 to 2021/04/15.258.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.36 and 1.36 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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