Asteroids

2012GD help

Last update: 2024-04-25 14:31 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.970

Aphelion (Q)

3.024

Eccentricity (e)

0.514

Inclination (i)

0.5

deg

Orbit period (P)

1030.9

Earth MOID

0.00061

U parameter

9.0

Next Earth close approach

Date

2040-04-06

Nominal distance (from Earth center)

0.06729

10065820

Maximum Brightness

23.3

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.9

mag

Diameter

11 - 24*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2012-04-01

Observatory

Mt. Lemmon Survey

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.997129

1-sigma variation

2.665500

Unit

Eccentricity (e)

Value

0.514315

1-sigma variation

0.545834

Unit

Inclination (i)

Value

0.4855

1-sigma variation

7.7678

Unit

Long. of Ascending Node (Ω)

Value

80.2789

1-sigma variation

67.5682

Unit

Arg. of Perihelion (ω)

Value

153.6827

1-sigma variation

144.4070

Unit

Mean Anomaly (M)

Value

109.44930

1-sigma variation

228.86100

Unit

Perihelion distance

Value

0.969975

1-sigma variation

Unit

Aphelion distance

Value

3.024283

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.751246

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.011365

1-sigma variation

Unit

MOID

Value

0.000608

1-sigma variation

Unit

Orbit Period

Value

1030.8787

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.10491E0	1.45492E0	-2.07052E1	-1.80103E2	3.84918E2	-6.10029E2
e	1.45492E0	2.97934E-1	-4.23994E0	-3.68810E1	7.88222E1	-1.24920E2
i	-2.07052E1	-4.23994E0	6.03390E1	5.24858E2	-1.12173E3	1.77775E3
Ω	-1.80103E2	-3.68810E1	5.24858E2	4.56547E3	-9.75733E3	1.54637E4
ω	3.84918E2	7.88222E1	-1.12173E3	-9.75733E3	2.08534E4	-3.30491E4
M	-6.10029E2	-1.24920E2	1.77775E3	1.54637E4	-3.30491E4	5.23772E4

Date of computation: 2024-04-23 10:08 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

26.945

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

11 - 24*

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 ODIM	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

4403

Unit

Source

[1]

Normalized RMS of residuals

Value

0.645634

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2012-04-01.34437

Unit

Source

[2]

Last Observation

Value

2012-04-06.292896

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

18 (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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

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

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2012GD from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
MARS	1959-04-19 00:20	> 1 mo	0.0445683	0.0409469	0.4279174
EARTH	1962-06-30 07:18	> 1 mo	0.1004897	0.0011438	1.3674611
EARTH	1987-05-09 22:03	> 1 mo	0.0392581	0.0138492	0.1930862
EARTH	2012-04-10 08:34	< 1 min	0.0242337	0.0238831	0.0001169
EARTH	2023-06-16 19:44	> 1 mo	0.0041695	0.0005951	0.4242415
EARTH	2040-04-06 20:16	> 1 mo	0.0672859	0.0067782	191.2224039
EARTH	2071-04-02 09:35	> 1 mo	0.1042231	0.0071092	325.6506771
EARTH	2085-07-04 14:51	> 1 mo	0.1303542	0.0013889	215.6015546
EARTH	2102-04-03 16:10	> 1 mo	0.1149336	0.0066510	76.2497856
EARTH	2116-07-02 21:50	> 1 mo	0.0895551	0.0011874	246.3787957

Download as:

2012GD

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2036-04-10.995	64793.995	-0.013	2.371	1.63 ± 2.274	1.63E7	8.66E-11	7.68E-12	-10.48
2058-06-12.115	72891.115	4.698	0.000	0.41 ± 0.062	4.63E5	4.43E-11	4.57E-12	-11.16
2067-04-12.665	76117.665	-0.013	0.652	1.64 ± 2.187	5.95E7	2.07E-9	1.83E-10	-9.65
2097-06-10.763	87134.763	0.734	0.000	0.54 ± 0.091	4.63E7	2.11E-8	1.89E-9	-8.86
2106-04-13.484	90362.484	0.102	0.470	1.62 ± 2.514	1.30E7	1.27E-8	1.13E-9	-9.13


Based on 18 optical observations (of which 1 are rejected as outliers) from 2012/04/01.344 to 2012/04/06.293.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.62 and 1.62 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20240110 090432.649 UTC.

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