Asteroids

138258 2000GD2 help

Last update: 2024-04-16 14:31 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.396

Aphelion (Q)

1.119

Eccentricity (e)

0.477

Inclination (i)

32.1

deg

Orbit period (P)

240.9

Earth MOID

0.07175

U parameter

0.9

Next Earth close approach

Date

2031-03-14

Nominal distance (from Earth center)

0.12618

18876373

Maximum Brightness

17.4

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

19.1

mag

Diameter

270

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2000-04-03

Observatory

Lincoln Laboratory ETS, New Mexico

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

0.757768

1-sigma variation

3.751E-9

Unit

Eccentricity (e)

Value

0.476770

1-sigma variation

2.124E-7

Unit

Inclination (i)

Value

32.1358

1-sigma variation

3.173E-5

Unit

Long. of Ascending Node (Ω)

Value

358.1173

1-sigma variation

4.123E-6

Unit

Arg. of Perihelion (ω)

Value

16.9801

1-sigma variation

1.710E-5

Unit

Mean Anomaly (M)

Value

281.25986

1-sigma variation

0.00009

Unit

Perihelion distance

Value

0.396487

1-sigma variation

Unit

Aphelion distance

Value

1.119049

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.601282

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.080942

1-sigma variation

Unit

MOID

Value

0.071747

1-sigma variation

Unit

Orbit Period

Value

240.9366

1-sigma variation

Unit

U parameter

Value

0.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.40695E-17	-2.88940E-16	-3.22688E-14	-7.66845E-16	-7.37447E-15	-2.97658E-13
e	-2.88940E-16	4.51072E-14	3.98183E-12	1.76253E-13	2.02009E-12	-1.05892E-12
i	-3.22688E-14	3.98183E-12	1.00669E-9	-3.96860E-11	6.18778E-12	5.19124E-10
Ω	-7.66845E-16	1.76253E-13	-3.96860E-11	1.69993E-11	-8.10569E-12	-1.07595E-11
ω	-7.37447E-15	2.02009E-12	6.18778E-12	-8.10569E-12	2.92297E-10	-5.62345E-10
M	-2.97658E-13	-1.05892E-12	5.19124E-10	-1.07595E-11	-5.62345E-10	8.39101E-9

Date of computation: 2024-02-21 14:29 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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.149

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.56

Unit

Source

[4]

Diameter

Value

270

Unit

Source

[4]

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

Visual S

Unit

Source

[5]

[6]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[2]	EARN	1.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.) 2.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects) 3.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[3]	ESA ODIM	ESA orbit determination and impact monitoring system
[4]	EARN	1.) Wolters, S.D. et al. (2008) Icarus 193, 535-552. (Thermal infrared and optical observations of four near-Earth asteroid) (433,66063,137032,138258)
[5]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[6]	EARN	1.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9165

Unit

Source

[1]

Unobserved

Value

351

Unit

Source

[1]

Normalized RMS of residuals

Value

0.618616

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-03-29.2319

Unit

Source

[2]

Last Observation

Value

2023-05-02.200322

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

245 (6)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2002-03-12

Unit

Source

[3]

Last Observation

Value

2002-03-16

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

2 (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 138258 2000GD2 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
MERCURY	1955-10-07 11:13	< 1 min	0.0473010	0.0472950	0.0000020
EARTH	1967-03-14 22:44	< 1 min	0.1727483	0.1727445	0.0000013
EARTH	1969-03-14 11:05	< 1 min	0.0925431	0.0925408	0.0000008
MERCURY	1970-12-09 09:41	< 1 min	0.0450365	0.0450337	0.0000009
EARTH	1971-03-16 22:25	< 1 min	0.0790031	0.0790020	0.0000004
EARTH	1973-03-20 03:50	< 1 min	0.1350576	0.1350555	0.0000007
MERCURY	1986-02-10 10:15	< 1 min	0.0441421	0.0441406	0.0000005
EARTH	1998-03-15 02:54	< 1 s	0.1957891	0.1957886	0.0000001
EARTH	2000-03-14 03:60	< 1 s	0.1081359	0.1081357	0.0000001
MERCURY	2001-04-14 06:24	< 1 min	0.0424074	0.0424071	0.0000001
EARTH	2002-03-16 04:18	< 1 s	0.0727835	0.0727832	0.0000001
EARTH	2004-03-19 00:46	< 1 s	0.1198623	0.1198620	0.0000001
EARTH	2006-03-24 04:56	< 1 min	0.1857394	0.1857390	0.0000001
MERCURY	2016-06-16 09:39	< 1 min	0.0424232	0.0424225	0.0000002
EARTH	2031-03-14 23:51	< 1 s	0.1261808	0.1261782	0.0000009
MERCURY	2031-08-19 03:16	< 1 min	0.0432007	0.0431992	0.0000005
EARTH	2033-03-15 11:56	< 1 min	0.0722590	0.0722585	0.0000001
EARTH	2035-03-18 22:09	< 1 min	0.1049072	0.1049049	0.0000008
EARTH	2037-03-22 20:51	< 1 min	0.1701873	0.1701847	0.0000009
MERCURY	2046-10-21 08:16	< 1 min	0.0418941	0.0418935	0.0000002
MERCURY	2061-12-23 00:32	< 1 min	0.0461221	0.0461153	0.0000023
EARTH	2062-03-14 22:16	< 1 s	0.1467071	0.1467004	0.0000023
EARTH	2064-03-14 23:16	< 1 min	0.0775970	0.0775941	0.0000010
EARTH	2066-03-17 23:35	< 1 min	0.0917500	0.0917455	0.0000015
EARTH	2068-03-21 14:10	< 1 min	0.1546447	0.1546387	0.0000020
MERCURY	2077-02-24 06:45	< 1 min	0.0429281	0.0429228	0.0000018
EARTH	2093-03-14 23:34	< 1 min	0.1672913	0.1672786	0.0000042
EARTH	2095-03-15 13:10	< 1 min	0.0881311	0.0881232	0.0000026
EARTH	2097-03-17 01:60	< 1 min	0.0804246	0.0804187	0.0000020
EARTH	2099-03-21 09:18	< 1 min	0.1391040	0.1390941	0.0000033
MERCURY	2107-07-02 03:27	< 1 min	0.0465414	0.0465252	0.0000054
EARTH	2124-03-16 02:16	< 1 min	0.1873526	0.1873337	0.0000063

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