Asteroids

308242 2005GO21 help

Last update: 2025-08-10 12:45 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Aten

Perihelion (q)

0.497

Aphelion (Q)

1.009

Eccentricity (e)

0.340

Inclination (i)

24.9

deg

Orbit period (P)

238.8

Earth MOID

0.04362

U parameter

0.2

Next Earth close approach

Date

2027-06-20

Nominal distance (from Earth center)

0.19621

29352068

Maximum Brightness

15.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.4

mag

Diameter

1400 - 3000*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2005-04-01

Observatory

Siding Spring 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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.753249

1-sigma variation

1.732E-9

Unit

Eccentricity (e)

Value

0.339952

1-sigma variation

7.433E-8

Unit

Inclination (i)

Value

24.9275

1-sigma variation

5.306E-6

Unit

Long. of Ascending Node (Ω)

Value

272.6707

1-sigma variation

2.410E-6

Unit

Arg. of Perihelion (ω)

Value

156.6416

1-sigma variation

1.489E-5

Unit

Mean Anomaly (M)

Value

105.79057

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.497180

1-sigma variation

Unit

Aphelion distance

Value

1.009317

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.047671

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.476110

1-sigma variation

Unit

MOID

Value

0.043622

1-sigma variation

Unit

Orbit Period

Value

238.7845

1-sigma variation

Unit

U parameter

Value

0.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.00096E-18	6.30390E-17	-3.80235E-15	2.23359E-15	-1.34066E-14	-1.21965E-14
e	6.30390E-17	5.52469E-15	-2.75091E-13	1.63916E-13	-1.10347E-12	1.29618E-12
i	-3.80235E-15	-2.75091E-13	2.81578E-11	-1.17601E-11	5.86415E-11	-5.63432E-11
Ω	2.23359E-15	1.63916E-13	-1.17601E-11	5.80659E-12	-3.36624E-11	3.39468E-11
ω	-1.34066E-14	-1.10347E-12	5.86415E-11	-3.36624E-11	2.21786E-10	-2.49641E-10
M	-1.21965E-14	1.29618E-12	-5.63432E-11	3.39468E-11	-2.49641E-10	6.24411E-10

Date of computation: 2025-08-10 12:45 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

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.24

Unit

mag

Source

[1]

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

16.368

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

1400 - 3000*

Unit

Source

[3]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[4]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Higgins, D.J. (2012) http://www.david-higgins.com/Astronomy/astero id/lightcurves.htm
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude
[4]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

7434

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.36798

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-04-01.77823

Unit

Source

[2]

Last Observation

Value

2025-08-09.269016

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

534 (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

2012-06-16

Unit

Source

[3]

Last Observation

Value

2014-06-18

Unit

Source

[3]

Delay (Discarded)

Value

6 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

8 (0)

Unit

Source

[1]

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
[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 308242 2005GO21 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	1961-06-21 17:51	< 1 min	0.0939029	0.0938983	0.0000015
EARTH	1963-06-20 08:12	< 1 min	0.1385983	0.1385933	0.0000016
EARTH	1978-06-22 06:29	< 1 s	0.0578892	0.0578871	0.0000007
EARTH	1980-06-18 13:40	< 1 min	0.1817893	0.1817862	0.0000010
EARTH	1995-06-22 12:17	< 1 s	0.0460970	0.0460966	0.0000001
EARTH	2012-06-21 18:14	< 1 s	0.0439634	0.0439634	0.0000000
EARTH	2027-06-20 05:50	< 1 s	0.1962065	0.1962058	0.0000002
EARTH	2029-06-21 23:01	< 1 s	0.0465440	0.0465438	0.0000001
EARTH	2044-06-20 08:10	< 1 min	0.1685275	0.1685255	0.0000007
EARTH	2046-06-21 22:08	< 1 s	0.0636201	0.0636184	0.0000006
EARTH	2061-06-21 15:42	< 1 min	0.1230306	0.1230277	0.0000010
EARTH	2063-06-21 10:04	< 1 min	0.1074323	0.1074293	0.0000010
EARTH	2078-06-22 12:11	< 1 s	0.0777602	0.0777577	0.0000008
EARTH	2080-06-19 14:35	< 1 min	0.1565917	0.1565888	0.0000010
EARTH	2095-06-22 21:19	< 1 s	0.0510045	0.0510035	0.0000003
EARTH	2097-06-19 00:00	< 1 min	0.1916026	0.1916007	0.0000006
EARTH	2112-06-23 03:20	< 1 s	0.0444104	0.0444101	0.0000001

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
209.65755231	168.14591432	0.04362158	MINIMUM
51.77633487	32.71968367	0.45647928	MINIMUM
60.75601393	43.10592634	0.45661433	SADDLE
325.75518448	283.31719562	0.54400311	SADDLE
345.86701875	131.30272428	1.50095510	SADDLE
183.57157413	330.93418696	1.98880242	MAXIMUM

Download:

MOID Plots

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