Asteroids

2008XA2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.924

Aphelion (Q)

3.845

Eccentricity (e)

0.613

Inclination (i)

2.9

deg

Orbit period (P)

1345.0

Earth MOID

0.00784

U parameter

0.1

Next Earth close approach

Date

2078-08-11

Nominal distance (from Earth center)

0.19069

28526153

Maximum Brightness

20.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.5

mag

Diameter

130 - 300*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2008-12-04

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.384579

1-sigma variation

6.702E-9

Unit

Eccentricity (e)

Value

0.612611

1-sigma variation

0.000001

Unit

Inclination (i)

Value

2.9262

1-sigma variation

2.639E-5

Unit

Long. of Ascending Node (Ω)

Value

39.6775

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

334.5007

1-sigma variation

0.0004

Unit

Mean Anomaly (M)

Value

232.27526

1-sigma variation

0.00003

Unit

Perihelion distance

Value

0.923760

1-sigma variation

Unit

Aphelion distance

Value

3.845397

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.033285

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.324861

1-sigma variation

Unit

MOID

Value

0.007836

1-sigma variation

Unit

Orbit Period

Value

1344.9802

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.49203E-17	-3.09206E-15	-4.71210E-14	-2.89608E-13	1.52839E-12	-1.93832E-13
e	-3.09206E-15	2.83626E-13	4.38176E-12	3.46121E-11	-1.43525E-10	1.59089E-11
i	-4.71210E-14	4.38176E-12	6.96208E-10	8.54212E-9	-1.02535E-8	2.54150E-10
Ω	-2.89608E-13	3.46121E-11	8.54212E-9	1.18575E-7	-1.29247E-7	1.42055E-9
ω	1.52839E-12	-1.43525E-10	-1.02535E-8	-1.29247E-7	1.83600E-7	-7.92670E-9
M	-1.93832E-13	1.59089E-11	2.54150E-10	1.42055E-9	-7.92670E-9	9.87632E-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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

21.477

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

130 - 300*

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

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

4044

Unit

Source

[1]

Unobserved

Value

2132

Unit

Source

[1]

Normalized RMS of residuals

Value

0.435333

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2008-12-04.12838

Unit

Source

[2]

Last Observation

Value

2019-12-31.36163

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

91 (0)

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

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 2008XA2 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	1975-11-11 02:29	1.1	0.0083554	0.0083467	0.0000029
EARTH	1986-11-26 18:41	< 1 min	0.1323972	0.1323834	0.0000046
EARTH	1997-11-27 01:43	< 1 min	0.1249204	0.1249150	0.0000018
EARTH	2008-11-22 13:09	< 1 min	0.0801178	0.0801172	0.0000002
EARTH	2078-08-11 07:51	< 1 min	0.1906856	0.1906530	0.0000109
EARTH	2089-10-15 17:05	3.5	0.0782032	0.0781998	0.0000011
EARTH	2100-11-11 12:30	1.0	0.0251060	0.0250986	0.0000025
EARTH	2111-10-05 04:13	6.6	0.0913402	0.0913370	0.0000011
EARTH	2122-09-10 09:25	9.9	0.0624288	0.0623958	0.0000110

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
17.18348224	306.96267245	0.00793331	MINIMUM
340.88965685	234.82600503	0.04635406	MINIMUM
357.56696669	268.02997405	0.07991640	SADDLE
358.65212032	90.24242654	1.92332213	SADDLE
179.66002236	91.56739635	2.84534543	SADDLE
179.70223411	271.58828805	4.84450608	MAXIMUM

Download:

MOID Plots

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