Asteroids

438661 2008EP6 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.855

Aphelion (Q)

1.563

Eccentricity (e)

0.293

Inclination (i)

17.7

deg

Orbit period (P)

485.5

Earth MOID

0.04781

U parameter

0.0

Next Earth close approach

Date

2097-02-10

Nominal distance (from Earth center)

0.1864

27885078

Maximum Brightness

18.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.3

mag

Diameter

400 - 800*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2008-03-05

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.208910

1-sigma variation

2.098E-9

Unit

Eccentricity (e)

Value

0.293139

1-sigma variation

2.961E-8

Unit

Inclination (i)

Value

17.7238

1-sigma variation

1.074E-5

Unit

Long. of Ascending Node (Ω)

Value

303.2197

1-sigma variation

9.528E-6

Unit

Arg. of Perihelion (ω)

Value

130.3085

1-sigma variation

1.009E-5

Unit

Mean Anomaly (M)

Value

168.41637

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.854531

1-sigma variation

Unit

Aphelion distance

Value

1.563289

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.346693

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.055848

1-sigma variation

Unit

MOID

Value

0.047808

1-sigma variation

Unit

Orbit Period

Value

485.5002

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.40257E-18	-4.74948E-17	-1.40605E-15	7.88625E-15	-3.53916E-15	-2.06116E-14
e	-4.74948E-17	8.76754E-16	4.68089E-14	-1.04890E-13	1.84870E-14	2.66848E-13
i	-1.40605E-15	4.68089E-14	1.15343E-10	-3.35570E-11	2.79426E-11	1.35927E-11
Ω	7.88625E-15	-1.04890E-13	-3.35570E-11	9.07784E-11	-8.72427E-11	-2.09745E-11
ω	-3.53916E-15	1.84870E-14	2.79426E-11	-8.72427E-11	1.01770E-10	-8.26256E-12
M	-2.06116E-14	2.66848E-13	1.35927E-11	-2.09745E-11	-8.26256E-12	1.08299E-10

Date of computation: 2025-09-10 00:30 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

19.339

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

400 - 800*

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

Radar R

Unit

Source

[3]

Download this part as:

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude
[3]	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

5882

Unit

Source

[1]

Unobserved

Value

554

Unit

Source

[1]

Normalized RMS of residuals

Value

0.392062

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2008-03-05.55029

Unit

Source

[2]

Last Observation

Value

2024-04-12.85782

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

248 (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

2016-01-18

Unit

Source

[3]

Last Observation

Value

2016-01-18

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

1 (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 438661 2008EP6 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	2004-02-11 02:26	< 1 min	0.1831056	0.1831050	0.0000002
EARTH	2008-02-05 21:34	< 1 min	0.1119790	0.1119786	0.0000001
EARTH	2012-02-01 00:07	< 1 s	0.0605170	0.0605168	0.0000001
MARS	2012-11-24 02:38	< 1 min	0.0068037	0.0068034	0.0000001
EARTH	2016-01-27 02:29	< 1 s	0.0501681	0.0501680	0.0000001
EARTH	2020-01-20 10:27	< 1 min	0.0924025	0.0924021	0.0000001
EARTH	2024-01-10 23:53	< 1 min	0.1543352	0.1543346	0.0000002
EARTH	2097-02-10 23:03	< 1 min	0.1864002	0.1863975	0.0000009
EARTH	2101-02-06 01:09	< 1 min	0.1069571	0.1069547	0.0000008
EARTH	2105-01-31 10:01	< 1 min	0.0544840	0.0544830	0.0000003
EARTH	2109-01-26 06:02	< 1 min	0.0570532	0.0570519	0.0000004
EARTH	2113-01-19 07:58	< 1 min	0.1034259	0.1034234	0.0000008
EARTH	2117-01-09 15:39	< 1 min	0.1637354	0.1637326	0.0000009

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
41.84437153	25.32505199	0.04773875	MINIMUM
280.44815367	233.91125930	0.22608707	MINIMUM
331.86545464	294.97663968	0.30604772	SADDLE
165.25016658	141.17249195	0.63494166	SADDLE
353.42594259	144.33291051	1.85392356	SADDLE
182.62520934	334.36375268	2.53257313	MAXIMUM

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MOID Plots

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