Asteroids

2021GN1 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.809

Aphelion (Q)

1.186

Eccentricity (e)

0.189

Inclination (i)

26.9

deg

Orbit period (P)

364.1

Earth MOID

0.03088

U parameter

7.8

Next Earth close approach

Date

2026-04-01

Nominal distance (from Earth center)

0.08397

12561142

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

15 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-04-04

Observatory

Mt. Lemmon Survey

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.997860

1-sigma variation

0.000403

Unit

Eccentricity (e)

Value

0.188837

1-sigma variation

0.000035

Unit

Inclination (i)

Value

26.9321

1-sigma variation

0.0520

Unit

Long. of Ascending Node (Ω)

Value

14.0748

1-sigma variation

0.0009

Unit

Arg. of Perihelion (ω)

Value

68.2861

1-sigma variation

0.1085

Unit

Mean Anomaly (M)

Value

322.32785

1-sigma variation

1.22744

Unit

Perihelion distance

Value

0.809427

1-sigma variation

Unit

Aphelion distance

Value

1.186293

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.100276

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.033159

1-sigma variation

Unit

MOID

Value

0.030876

1-sigma variation

Unit

Orbit Period

Value

364.0851

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.62594E-7	1.40065E-8	2.09792E-5	-3.72506E-7	4.37448E-5	-4.94939E-4
e	1.40065E-8	1.23726E-9	1.80641E-6	-3.20929E-8	3.76891E-6	-4.26403E-5
i	2.09792E-5	1.80641E-6	2.70720E-3	-4.80614E-5	5.64419E-3	-6.38608E-2
Ω	-3.72506E-7	-3.20929E-8	-4.80614E-5	8.53442E-7	-1.00221E-4	1.13391E-3
ω	4.37448E-5	3.76891E-6	5.64419E-3	-1.00221E-4	1.17693E-2	-1.33160E-1
M	-4.94939E-4	-4.26403E-5	-6.38608E-2	1.13391E-3	-1.33160E-1	1.50660E0

Date of computation: 2025-09-10 00:30 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

26.307

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

15 - 30*

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

[-]

Download this part as:

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

Unit

Source

[1]

Unobserved

Value

1670

Unit

Source

[1]

Normalized RMS of residuals

Value

0.801072

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-04-03.3346

Unit

Source

[2]

Last Observation

Value

2021-04-06.281238

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

31 (1)

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

Close Approaches for 2021GN1 from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	2012-04-06 03:08	1430.5	0.1702454	0.0563335	0.0397934
EARTH	2013-04-05 14:05	1272.4	0.1410387	0.0412839	0.0365093
EARTH	2014-04-05 03:11	1102.7	0.1139441	0.0336421	0.0326452
EARTH	2015-04-04 19:11	921.9	0.0896674	0.0326104	0.0279581
EARTH	2016-04-03 13:13	723.4	0.0686784	0.0322543	0.0222917
EARTH	2017-04-03 09:36	530.5	0.0518010	0.0320327	0.0155060
EARTH	2018-04-03 08:21	346.9	0.0399891	0.0319558	0.0082599
EARTH	2019-04-03 08:49	192.5	0.0338487	0.0318810	0.0027428
EARTH	2020-04-02 10:41	83.5	0.0318915	0.0318620	0.0001525
EARTH	2021-04-02 13:32	< 1 min	0.0326382	0.0324641	0.0000580
EARTH	2022-04-02 15:55	73.1	0.0360643	0.0326561	0.0016478
EARTH	2023-04-02 18:06	141.7	0.0426590	0.0327747	0.0050207
EARTH	2024-04-01 20:17	190.2	0.0528919	0.0331814	0.0093884
EARTH	2025-04-01 22:04	208.5	0.0667840	0.0346238	0.0138311
EARTH	2026-04-01 23:57	195.1	0.0839660	0.0384971	0.0178433
EARTH	2027-04-02 03:21	133.4	0.1032154	0.0455070	0.0213290
EARTH	2028-04-01 07:25	43.2	0.1241496	0.0559593	0.0243177
EARTH	2029-04-01 13:18	77.9	0.1464904	0.0694728	0.0269003
EARTH	2030-04-01 22:02	241.9	0.1699162	0.0854838	0.0291443
EARTH	2031-04-02 07:34	415.3	0.1940179	0.1030727	0.0311816
EARTH	2040-10-16 08:33	> 1 d	0.1853916	0.1141461	0.0378725
EARTH	2041-10-14 09:36	> 1 d	0.1644539	0.1091155	0.0363100
EARTH	2042-10-12 13:00	> 1 d	0.1451604	0.1052968	0.0336751
EARTH	2043-10-10 19:54	> 1 d	0.1282949	0.1023910	0.0297471
EARTH	2044-10-08 04:15	> 1 d	0.1143803	0.1002245	0.0240460
EARTH	2045-10-06 13:54	> 1 d	0.1043371	0.0989758	0.0160726
EARTH	2046-10-05 00:58	> 1 d	0.0990377	0.0984531	0.0056348
EARTH	2047-10-03 11:59	> 1 d	0.0991312	0.0984064	0.0065746
EARTH	2048-09-30 22:48	> 1 d	0.1050493	0.0990531	0.0193691
EARTH	2049-09-29 09:01	> 1 d	0.1163258	0.1002379	0.0315653
EARTH	2050-09-27 17:09	> 1 d	0.1325009	0.1020442	0.0423688
EARTH	2051-09-25 23:23	> 1 d	0.1529761	0.1046512	0.0515738
EARTH	2052-09-23 05:21	> 1 d	0.1764086	0.1078146	0.0591827

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
99.69571863	89.63312716	0.03194695	MINIMUM
297.91559839	269.41834821	0.09511085	MINIMUM
17.31247170	0.89042763	0.44944708	SADDLE
200.77820286	176.75372221	0.53113706	SADDLE
7.30347428	167.73547570	1.77990991	SADDLE
162.39361008	321.84192536	2.12710833	MAXIMUM

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MOID Plots

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