Asteroids

386454 2008XM help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.111

Aphelion (Q)

2.333

Eccentricity (e)

0.909

Inclination (i)

5.4

deg

Orbit period (P)

493.5

Earth MOID

0.00456

U parameter

0.7

Next Earth close approach

Date

2031-11-17

Nominal distance (from Earth center)

0.08042

12030490

Maximum Brightness

16.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

367

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2008-12-02

Observatory

Lincoln Laboratory ETS, New Mexico

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

1.222180

1-sigma variation

7.481E-9

Unit

Eccentricity (e)

Value

0.909163

1-sigma variation

2.699E-8

Unit

Inclination (i)

Value

5.4349

1-sigma variation

1.816E-5

Unit

Long. of Ascending Node (Ω)

Value

240.5413

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

27.4673

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

18.60797

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.111020

1-sigma variation

Unit

Aphelion distance

Value

2.333340

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.894770

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.109968

1-sigma variation

Unit

MOID

Value

0.004558

1-sigma variation

Unit

Orbit Period

Value

493.5160

1-sigma variation

Unit

U parameter

Value

0.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.59586E-17	6.08186E-17	3.02100E-14	6.57448E-14	-4.10469E-14	-3.18211E-13
e	6.08186E-17	7.28214E-16	-1.32080E-14	2.11576E-14	2.55281E-14	-3.12423E-13
i	3.02100E-14	-1.32080E-14	3.29968E-10	7.69146E-10	-7.18631E-10	-2.11505E-10
Ω	6.57448E-14	2.11576E-14	7.69146E-10	5.24912E-9	-5.13664E-9	-4.35881E-10
ω	-4.10469E-14	2.55281E-14	-7.18631E-10	-5.13664E-9	5.06394E-9	2.81663E-10
M	-3.18211E-13	-3.12423E-13	-2.11505E-10	-4.35881E-10	2.81663E-10	1.83464E-9

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

[-]

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

20.043

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.128

Unit

Source

[2]

Diameter

Value

367

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

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	EARN	1.) Mainzer, A. et al. (2014) Astrophys. J. 784, 110. (The Population of Tiny Near-Earth Objects Observed by NEOWISE)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

5486

Unit

Source

[1]

Unobserved

Value

1028

Unit

Source

[1]

Normalized RMS of residuals

Value

0.588588

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2008-12-02.13027

Unit

Source

[2]

Last Observation

Value

2023-12-10.352435

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

106 (2)

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

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

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Initial Date: *

Final Date: *

Output option:

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Time step:*

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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 386454 2008XM 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	1958-11-22 06:04	< 1 min	0.0593272	0.0593188	0.0000028
EARTH	1960-01-18 06:23	< 1 min	0.0803255	0.0803239	0.0000005
EARTH	1981-11-16 16:08	< 1 min	0.0911387	0.0911326	0.0000020
EARTH	1983-01-12 01:55	< 1 min	0.1801398	0.1801347	0.0000017
EARTH	1987-01-23 08:42	< 1 min	0.1585528	0.1585488	0.0000013
VENUS	1996-09-12 10:04	< 1 min	0.0345083	0.0345078	0.0000002
EARTH	2008-11-22 18:08	< 1 s	0.0744682	0.0744676	0.0000002
EARTH	2010-01-18 18:41	< 1 s	0.0791750	0.0791743	0.0000002
EARTH	2031-11-17 22:19	< 1 min	0.0804189	0.0804156	0.0000011
EARTH	2033-01-12 08:32	< 1 min	0.1716453	0.1716422	0.0000010
EARTH	2037-01-23 06:05	< 1 min	0.1609606	0.1609570	0.0000012
EARTH	2058-11-22 04:46	< 1 min	0.0394821	0.0394777	0.0000014
EARTH	2060-01-18 08:06	< 1 min	0.0840056	0.0840041	0.0000005
MERCURY	2061-07-08 09:56	< 1 min	0.0458418	0.0458375	0.0000014
MERCURY	2079-02-05 05:53	< 1 min	0.0395542	0.0395534	0.0000002
VENUS	2079-02-20 02:30	< 1 min	0.0357581	0.0357577	0.0000002
EARTH	2081-11-19 07:10	< 1 min	0.0364467	0.0364450	0.0000006
EARTH	2083-01-15 05:08	< 1 min	0.1320509	0.1320491	0.0000006
VENUS	2085-11-25 04:45	< 1 min	0.0446590	0.0446569	0.0000007
MERCURY	2103-06-05 18:06	< 1 min	0.0389999	0.0389969	0.0000010
EARTH	2104-11-15 15:15	< 1 min	0.1824715	0.1824665	0.0000017
EARTH	2108-11-26 00:30	< 1 min	0.1105933	0.1105880	0.0000018
EARTH	2110-01-21 19:43	< 1 min	0.0878844	0.0878820	0.0000008

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
77.87408918	314.08984147	0.00455840	MINIMUM
282.44659697	13.64069100	0.07890109	MINIMUM
1.06659742	166.30650081	0.90538574	SADDLE
1.02216964	346.14628306	1.09498473	SADDLE
180.12201220	343.64045712	1.35078488	SADDLE
180.02431020	163.62301571	3.34882041	MAXIMUM

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MOID Plots

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