Asteroids

308242 2005GO21 help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

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

0.04398

U parameter

0.1

Next Earth close approach

Date

2027-06-20

Nominal distance (from Earth center)

0.19621

29352069

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.753260

1-sigma variation

1.579E-9

Unit

Eccentricity (e)

Value

0.339878

1-sigma variation

7.266E-8

Unit

Inclination (i)

Value

24.9273

1-sigma variation

5.196E-6

Unit

Long. of Ascending Node (Ω)

Value

272.6689

1-sigma variation

2.342E-6

Unit

Arg. of Perihelion (ω)

Value

156.6466

1-sigma variation

1.453E-5

Unit

Mean Anomaly (M)

Value

348.82065

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.497243

1-sigma variation

Unit

Aphelion distance

Value

1.009277

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.048081

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.476037

1-sigma variation

Unit

MOID

Value

0.043981

1-sigma variation

Unit

Orbit Period

Value

238.7898

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.49303E-18	5.48057E-17	-3.16646E-15	1.90015E-15	-1.15961E-14	-1.25598E-14
e	5.48057E-17	5.28015E-15	-2.58485E-13	1.55139E-13	-1.05238E-12	1.23482E-12
i	-3.16646E-15	-2.58485E-13	2.69951E-11	-1.11470E-11	5.51356E-11	-5.38096E-11
Ω	1.90015E-15	1.55139E-13	-1.11470E-11	5.48375E-12	-3.18120E-11	3.22653E-11
ω	-1.15961E-14	-1.05238E-12	5.51356E-11	-3.18120E-11	2.11076E-10	-2.37651E-10
M	-1.25598E-14	1.23482E-12	-5.38096E-11	3.22653E-11	-2.37651E-10	6.24565E-10

Date of computation: 2026-07-30 09:40 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

16.374

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

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

7457

Unit

Source

[1]

Unobserved

Value

384

Unit

Source

[1]

Normalized RMS of residuals

Value

0.369764

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

2025-08-31.80896

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

550 (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

Filters

Initial Date: *

Final Date: *

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Max residual (arcsec):

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Computation parameters

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Final Date: *

Output option:

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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 308242 2005GO21 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	1961-06-21 17:51	< 1 min	0.0939028	0.0938986	0.0000014
EARTH	1963-06-20 08:12	< 1 min	0.1385983	0.1385938	0.0000015
EARTH	1978-06-22 06:29	< 1 s	0.0578892	0.0578872	0.0000006
EARTH	1980-06-18 13:40	< 1 min	0.1817893	0.1817865	0.0000009
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	0.1685257	0.0000006
EARTH	2046-06-21 22:08	< 1 s	0.0636201	0.0636185	0.0000005
EARTH	2061-06-21 15:42	< 1 min	0.1230307	0.1230280	0.0000009
EARTH	2063-06-21 10:04	< 1 min	0.1074323	0.1074295	0.0000009
EARTH	2078-06-22 12:11	< 1 s	0.0777603	0.0777579	0.0000008
EARTH	2080-06-19 14:35	< 1 min	0.1565916	0.1565890	0.0000009
EARTH	2095-06-22 21:19	< 1 s	0.0510046	0.0510036	0.0000003
EARTH	2097-06-19 00:00	< 1 min	0.1916025	0.1916008	0.0000006
EARTH	2112-06-23 03:20	< 1 s	0.0444104	0.0444102	0.0000001

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
209.61264290	165.90909826	0.04398087	MINIMUM
52.09182373	30.95023992	0.45609174	MINIMUM
60.71437014	40.90980208	0.45621141	SADDLE
325.65217459	281.06426463	0.54464280	SADDLE
345.61305664	128.87023205	1.50095175	SADDLE
183.47885711	328.66603419	1.98898367	MAXIMUM

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MOID Plots

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