Asteroids

2021GG1 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.743

Aphelion (Q)

2.368

Eccentricity (e)

0.522

Inclination (i)

0.9

deg

Orbit period (P)

708.7

Earth MOID

0.00047

U parameter

7.8

Next Earth close approach

Date

2046-09-23

Nominal distance (from Earth center)

0.19191

28709006

Maximum Brightness

25.9

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

26.5

mag

Diameter

13 - 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.555676

1-sigma variation

0.001042

Unit

Eccentricity (e)

Value

0.522248

1-sigma variation

0.000420

Unit

Inclination (i)

Value

0.9009

1-sigma variation

0.0008

Unit

Long. of Ascending Node (Ω)

Value

350.1873

1-sigma variation

0.0031

Unit

Arg. of Perihelion (ω)

Value

281.8596

1-sigma variation

0.0019

Unit

Mean Anomaly (M)

Value

214.57016

1-sigma variation

0.94234

Unit

Perihelion distance

Value

0.743228

1-sigma variation

Unit

Aphelion distance

Value

2.368124

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.014048

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.275655

1-sigma variation

Unit

MOID

Value

0.000467

1-sigma variation

Unit

Orbit Period

Value

708.7239

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.08588E-6	4.37479E-7	8.14033E-7	2.79745E-6	-1.44269E-6	-9.81973E-4
e	4.37479E-7	1.76256E-7	3.28078E-7	1.13010E-6	-5.83505E-7	-3.95617E-4
i	8.14033E-7	3.28078E-7	6.14279E-7	2.20078E-6	-1.16009E-6	-7.36141E-4
Ω	2.79745E-6	1.13010E-6	2.20078E-6	9.87508E-6	-5.74705E-6	-2.52983E-3
ω	-1.44269E-6	-5.83505E-7	-1.16009E-6	-5.74705E-6	3.47409E-6	1.30469E-3
M	-9.81973E-4	-3.95617E-4	-7.36141E-4	-2.52983E-3	1.30469E-3	8.88009E-1

Date of computation: 2026-03-17 23:26 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

26.51

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

13 - 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

[-]

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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

Unit

Source

[1]

Unobserved

Value

1838

Unit

Source

[1]

Normalized RMS of residuals

Value

0.699744

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-04-04.1546

Unit

Source

[2]

Last Observation

Value

2021-04-07.306198

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

46 (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 2021GG1 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	1957-09-11 17:05	> 1 w	0.0138911	0.0010866	0.1651988
EARTH	1961-04-27 15:28	> 1 mo	0.1683517	0.0050837	0.1197744
MARS	1968-10-16 16:21	> 1 d	0.0437578	0.0409652	0.0184152
EARTH	1986-09-16 16:06	> 1 d	0.0839403	0.0008770	0.1113212
MARS	1990-09-19 02:57	> 1 d	0.0427598	0.0316623	0.0693109
EARTH	1992-03-29 10:25	> 1 d	0.1218867	0.0066424	0.1227559
EARTH	2017-08-23 23:51	> 1 d	0.1540834	0.0906231	0.0211539
EARTH	2021-04-07 05:17	< 1 s	0.0136521	0.0136219	0.0000101
VENUS	2027-03-19 05:29	> 1 w	0.0195231	0.0111468	0.0141654
EARTH	2046-09-23 01:23	> 1 w	0.1919079	0.0001943	0.3036141
EARTH	2048-08-16 20:55	> 1 mo	0.1809343	0.0032799	0.2180729
EARTH	2052-04-08 15:33	> 1 w	0.0289630	0.0072333	0.2686958
EARTH	2081-08-30 11:50	> 1 mo	0.1201688	0.0018129	0.2653446
EARTH	2085-04-22 03:10	> 1 w	0.1378621	0.0080987	0.1370182
VENUS	2102-12-04 14:19	> 1 mo	0.0359111	0.0008841	1.3824943
VENUS	2114-07-21 04:58	1231.2	0.0412101	0.0400637	0.0011981
EARTH	2114-09-18 15:04	57.4	0.0810104	0.0672274	0.0048293
MARS	2114-11-07 20:57	1062.8	0.0321563	0.0120347	0.0075290
EARTH	2120-04-09 09:08	> 1 mo	0.0183543	0.0076071	0.8463050

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
47.60095419	248.09258659	0.00047993	MINIMUM
312.88778820	93.93124146	0.00693807	MINIMUM
0.32522931	171.09976309	0.27565841	SADDLE
180.10345843	350.85260316	1.38452448	SADDLE
0.32825117	351.11251128	1.72632226	SADDLE
180.11185454	170.85952847	3.38594375	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2021GG1

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2073-09-11.821	78461.821	-1.361	1.24 ± 0.005	5.04E4	9.94E-7	2.24E-1	-6.69
2075-09-12.038	79192.038	-2.656	0.18 ± 0.028	1.41E5	2.08E-7	2.23E-1	-7.39
2079-09-12.537	80653.537	-1.243	0.45 ± 0.006	1.88E6	2.31E-7	2.24E-1	-7.38
2079-09-12.699	80653.699	-1.254	1.10 ± 0.007	9.74E6	3.25E-8	2.25E-1	-8.23
2081-09-11.609	81383.609	-0.051	0.99 ± 0.005	3.02E5	2.05E-6	2.25E-1	-6.44
2085-09-11.971	82844.971	0.848	0.59 ± 0.162	6.95E6	8.88E-8	2.26E-1	-7.83
2087-09-12.443	83575.443	-1.267	0.93 ± 0.005	1.34E7	2.26E-8	2.23E-1	-8.44
2089-09-11.919	84305.919	0.354	0.34 ± 0.013	9.81E5	9.56E-7	2.26E-1	-6.83
2089-09-12.073	84306.073	1.067	0.65 ± 0.006	1.45E6	3.86E-7	2.26E-1	-7.22
2092-09-11.700	85401.700	-1.359	0.07 ± 0.063	1.20E7	3.29E-8	2.25E-1	-8.31
2093-09-11.748	85766.748	0.847	0.26 ± 0.009	2.74E7	2.49E-8	2.27E-1	-8.43
2098-09-12.482	87593.482	-3.021	0.87 ± 0.009	3.66E4	2.85E-7	2.23E-1	-7.41
2098-09-12.533	87593.533	-2.987	0.15 ± 0.040	2.69E4	4.28E-7	2.23E-1	-7.23
2098-09-12.544	87593.544	-2.981	0.50 ± 0.011	3.46E4	3.15E-7	2.23E-1	-7.37
2100-09-12.850	88323.850	0.332	1.20 ± 0.005	2.23E7	1.39E-8	2.27E-1	-8.73
2101-09-13.060	88689.060	1.506	1.14 ± 0.016	9.75E7	1.83E-9	2.28E-1	-9.61
2103-09-13.528	89419.528	0.347	0.35 ± 0.005	1.62E7	5.57E-8	2.26E-1	-8.14
2104-09-12.755	89784.755	-4.505	0.40 ± 0.006	8.33E3	4.49E-9	2.22E-1	-9.25
2104-09-12.799	89784.799	0.317	0.79 ± 0.007	1.56E6	5.98E-7	2.26E-1	-7.12
2104-09-12.947	89784.947	-0.847	1.03 ± 0.008	6.94E5	9.15E-7	2.25E-1	-6.93
2106-09-13.102	90515.102	0.323	0.34 ± 0.006	5.93E6	1.54E-7	2.27E-1	-7.72
2106-09-13.173	90515.173	-2.674	0.80 ± 0.006	7.59E5	2.92E-8	2.23E-1	-8.44
2106-09-13.354	90515.354	-1.366	0.81 ± 0.006	5.42E6	5.69E-8	2.25E-1	-8.15
2106-09-13.462	90515.462	-0.798	1.01 ± 0.006	9.07E4	4.71E-6	2.25E-1	-6.23
2108-09-13.012	91246.012	0.270	0.93 ± 0.006	5.08E6	1.27E-7	2.26E-1	-7.81
2108-09-13.039	91246.039	0.797	0.97 ± 0.006	6.20E5	7.41E-7	2.27E-1	-7.04
2108-09-13.149	91246.149	0.307	1.19 ± 0.009	1.15E6	2.68E-7	2.27E-1	-7.48
2108-09-13.214	91246.214	-1.078	0.99 ± 0.006	2.26E4	1.51E-5	2.25E-1	-5.74
2108-09-13.222	91246.222	-0.900	1.03 ± 0.006	3.52E5	1.08E-6	2.26E-1	-6.88
2109-09-13.030	91611.030	1.508	0.83 ± 0.012	7.26E6	3.47E-8	2.27E-1	-8.38
2110-09-13.080	91976.080	0.812	1.00 ± 0.007	5.75E7	8.15E-9	2.27E-1	-9.01
2110-09-13.505	91976.505	0.282	0.20 ± 0.019	7.42E6	1.29E-7	2.26E-1	-7.81
2110-09-13.595	91976.595	-1.081	0.36 ± 0.006	4.20E6	1.27E-7	2.25E-1	-7.82
2112-09-11.626	92705.626	0.343	0.80 ± 0.004	2.19E7	3.62E-8	2.26E-1	-8.37
2112-09-12.737	92706.737	0.788	0.86 ± 0.005	9.10E6	5.91E-8	2.27E-1	-8.16
2112-09-12.856	92706.856	-1.194	0.59 ± 0.006	1.60E5	2.72E-6	2.24E-1	-6.50
2114-09-13.429	93437.429	-3.589	1.06 ± 0.006	1.98E6	5.13E-10	2.22E-1	-10.24
2114-09-13.467	93437.467	0.750	0.04 ± 0.210	1.14E7	6.52E-8	2.27E-1	-8.13
2116-09-12.721	94167.721	0.101	1.24 ± 0.005	5.74E5	2.81E-7	2.26E-1	-7.50
2116-09-12.995	94167.995	0.557	1.24 ± 0.006	3.61E5	2.11E-6	2.26E-1	-6.63
2116-09-13.007	94168.007	0.503	0.72 ± 0.005	1.03E6	7.03E-7	2.26E-1	-7.10
2118-09-13.332	94898.332	0.265	0.35 ± 0.005	4.26E6	2.18E-7	2.26E-1	-7.62
2118-09-13.345	94898.345	1.256	0.85 ± 0.010	9.03E5	3.93E-7	2.27E-1	-7.37
2118-09-13.445	94898.445	0.266	0.80 ± 0.006	3.52E6	2.13E-7	2.26E-1	-7.63
2118-09-13.531	94898.531	0.670	1.21 ± 0.005	8.39E4	2.55E-6	2.26E-1	-6.55
2118-09-13.565	94898.565	0.644	1.18 ± 0.005	8.07E4	5.33E-6	2.25E-1	-6.23
2120-09-13.098	95629.098	1.257	1.13 ± 0.006	2.35E7	8.59E-9	2.27E-1	-9.03
2120-09-13.237	95629.237	0.671	1.15 ± 0.005	1.59E7	1.97E-8	2.27E-1	-8.67


Based on 46 optical observations (of which 2 are rejected as outliers) from 2021/04/04.155 to 2021/04/07.306.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.25 and 1.25 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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