Asteroids

2008ST help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.842

Aphelion (Q)

1.085

Eccentricity (e)

0.126

Inclination (i)

1.9

deg

Orbit period (P)

345.3

Earth MOID

0.00177

U parameter

7.1

Next Earth close approach

Date

2026-01-05

Nominal distance (from Earth center)

0.14191

21229562

Maximum Brightness

35.8

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

27.1

mag

Diameter

10 - 23*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2008-09-22

Observatory

Mt. Lemmon 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

0.963262

1-sigma variation

0.000130

Unit

Eccentricity (e)

Value

0.126222

1-sigma variation

0.000080

Unit

Inclination (i)

Value

1.8677

1-sigma variation

0.0093

Unit

Long. of Ascending Node (Ω)

Value

187.4308

1-sigma variation

0.2853

Unit

Arg. of Perihelion (ω)

Value

292.4174

1-sigma variation

0.3325

Unit

Mean Anomaly (M)

Value

300.17218

1-sigma variation

0.38846

Unit

Perihelion distance

Value

0.841678

1-sigma variation

Unit

Aphelion distance

Value

1.084847

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.094962

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.005924

1-sigma variation

Unit

MOID

Value

0.001769

1-sigma variation

Unit

Orbit Period

Value

345.3149

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.68059E-8	-1.03095E-8	-1.20926E-6	-3.69812E-5	4.31048E-5	-5.03591E-5
e	-1.03095E-8	6.32986E-9	7.41947E-7	2.26866E-5	-2.64435E-5	3.08928E-5
i	-1.20926E-6	7.41947E-7	8.70146E-5	2.66097E-3	-3.10160E-3	3.62356E-3
Ω	-3.69812E-5	2.26866E-5	2.66097E-3	8.13767E-2	-9.48515E-2	1.10814E-1
ω	4.31048E-5	-2.64435E-5	-3.10160E-3	-9.48515E-2	1.10558E-1	-1.29164E-1
M	-5.03591E-5	3.08928E-5	3.62356E-3	1.10814E-1	-1.29164E-1	1.50901E-1

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

27.089

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

10 - 23*

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

[-]

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Sources

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

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

6202

Unit

Source

[1]

Normalized RMS of residuals

Value

0.474433

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2008-09-22.16113

Unit

Source

[2]

Last Observation

Value

2008-09-29.27316

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

49 (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 2008ST 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	1951-05-25 19:23	139.6	0.0354554	0.0259754	0.0100622
EARTH	1952-01-11 22:20	> 1 w	0.1513477	0.1473433	0.0013420
EARTH	1952-09-25 16:37	480.2	0.1360159	0.0946563	0.0137898
EARTH	1965-05-27 11:07	151.3	0.0999414	0.0823180	0.0059203
EARTH	1966-02-01 00:47	> 1 w	0.1528262	0.1518230	0.0003417
EARTH	1966-09-28 19:07	232.1	0.0643567	0.0412273	0.0077145
EARTH	1979-05-28 17:49	88.1	0.0981205	0.0857937	0.0041343
EARTH	1980-02-01 09:25	> 1 d	0.1536699	0.1528464	0.0002766
EARTH	1980-09-28 18:28	86.7	0.0682482	0.0542030	0.0046842
EARTH	1993-05-27 15:43	2.4	0.0388392	0.0340778	0.0017023
EARTH	1994-01-15 03:03	> 1 d	0.1510389	0.1502282	0.0002706
EARTH	1994-09-28 16:43	97.5	0.1301766	0.1224147	0.0025873
EARTH	2007-06-01 19:58	4.1	0.1674571	0.1674071	0.0000167
EARTH	2008-02-24 06:42	100.9	0.1450762	0.1447856	0.0000969
EARTH	2008-09-28 10:22	< 1 min	0.0102465	0.0102261	0.0000068
EARTH	2025-05-20 00:49	915.5	0.0345648	0.0267937	0.0032738
EARTH	2026-01-05 09:43	> 1 d	0.1419109	0.1406878	0.0004100
EARTH	2026-09-27 00:06	355.3	0.0992753	0.0799231	0.0064510
EARTH	2042-05-22 00:42	> 1 d	0.0383220	0.0251032	0.0108548
EARTH	2043-01-01 01:25	> 1 w	0.1421736	0.1361290	0.0020334
EARTH	2043-09-25 04:21	856.0	0.1206963	0.0684960	0.0174055
EARTH	2058-05-21 07:53	1087.4	0.1041683	0.0488662	0.0191739
EARTH	2059-02-09 06:19	> 1 w	0.1428336	0.1370868	0.0020918
EARTH	2059-09-25 20:42	> 1 d	0.0110717	0.0014206	0.0174213
EARTH	2079-05-22 13:04	> 1 mo	0.0531617	0.0202842	1.8049625
EARTH	2080-01-01 14:37	> 1 mo	0.1368068	0.0725419	0.2542246
EARTH	2080-09-24 03:03	> 1 w	0.0582077	0.0007208	2.1110097
EARTH	2098-05-12 11:57	> 1 mo	0.0662368	0.0242908	13.2972599
EARTH	2099-02-05 10:58	> 1 mo	0.1353950	0.1113764	1.4080851
EARTH	2099-09-11 14:01	> 1 mo	0.0463285	0.0066125	9.1294185
EARTH	2119-05-10 08:45	> 1 mo	0.0316231	0.0236686	72.2304578
EARTH	2120-02-01 17:46	> 1 mo	0.1330192	0.1084303	7.6308373
EARTH	2120-09-08 19:56	> 1 mo	0.0526316	0.0151451	59.2981079
EARTH	2121-09-22 02:10	> 1 mo	0.1906809	0.0158892	44.0998951

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
252.43518277	265.00127953	0.00181792	MINIMUM
110.09354444	134.49444872	0.02546167	MINIMUM
179.77108773	198.50197190	0.07747375	SADDLE
1.71213482	19.99592689	0.14482802	SADDLE
3.16207554	201.60119558	1.85751948	SADDLE
182.46773557	20.90308608	2.07016003	MAXIMUM

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MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2008ST

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2056-09-27.790	72268.790	2.404	3.04 ± 0.005	1.46E5	5.88E-7	4.83E-2	-7.26
2057-09-28.138	72634.138	2.322	2.68 ± 0.012	8.34E4	1.93E-6	4.83E-2	-6.76
2072-09-27.626	78112.626	2.314	2.41 ± 0.005	7.93E5	1.85E-7	4.86E-2	-7.95
2076-09-26.469	79572.469	2.577	1.78 ± 0.253	2.93E7	3.21E-9	4.83E-2	-9.74
2078-09-25.832	80301.832	0.385	1.99 ± 0.019	4.21E6	5.35E-7	4.88E-2	-7.53
2080-09-24.472	81031.472	-0.906	2.62 ± 0.004	5.34E4	2.51E-5	4.86E-2	-5.88
2094-09-26.913	86146.913	2.797	2.75 ± 0.060	2.43E6	2.06E-8	4.84E-2	-9.06
2100-09-24.681	88335.681	0.375	1.51 ± 0.008	3.99E6	6.08E-7	4.87E-2	-7.62
2100-09-25.580	88336.580	-2.051	0.86 ± 0.013	2.96E5	1.14E-6	4.89E-2	-7.35
2101-09-24.832	88700.832	-1.091	3.04 ± 0.004	4.86E6	1.74E-7	4.89E-2	-8.17
2101-09-25.788	88701.788	-1.226	2.72 ± 0.003	2.40E5	3.68E-6	4.89E-2	-6.84
2102-09-25.190	89066.190	-0.076	3.00 ± 0.016	2.78E5	8.17E-6	4.88E-2	-6.50
2103-09-25.899	89431.899	-0.040	1.40 ± 0.074	8.49E5	3.14E-6	4.87E-2	-6.92
2103-09-26.847	89432.847	-2.147	3.35 ± 0.014	3.00E5	3.33E-7	4.89E-2	-7.90
2104-09-25.337	89797.337	-2.202	3.17 ± 0.008	4.04E7	3.03E-9	4.88E-2	-9.94
2104-09-25.832	89797.832	0.379	2.91 ± 0.004	5.92E6	2.68E-7	4.85E-2	-8.00
2104-09-26.408	89798.408	-2.158	0.98 ± 0.009	5.72E5	4.70E-7	4.89E-2	-7.75
2105-09-26.210	90163.210	0.380	0.76 ± 0.272	7.68E5	3.46E-6	4.86E-2	-6.89
2106-09-24.623	90526.623	-0.597	1.08 ± 0.012	1.16E6	1.95E-6	4.89E-2	-7.15
2106-09-26.682	90528.682	-0.563	3.04 ± 0.011	1.26E5	1.06E-5	4.89E-2	-6.41
2107-09-25.803	90892.803	-0.563	0.71 ± 0.000	1.99E7	1.20E-7	4.91E-2	-8.36
2108-09-23.963	91256.963	-0.156	2.39 ± 0.063	7.47E6	3.41E-7	4.90E-2	-7.91
2109-09-24.449	91622.449	-0.156	2.37 ± 0.016	8.57E6	2.65E-7	4.87E-2	-8.03
2110-09-23.609	91986.609	-0.156	2.57 ± 2.025	3.45E8	6.39E-9	4.88E-2	-9.65
2116-09-24.923	94179.923	-0.622	3.38 ± 0.003	9.97E5	1.14E-6	4.88E-2	-7.43
2116-09-25.657	94180.657	-1.539	2.84 ± 0.011	8.73E3	6.13E-5	4.89E-2	-5.70
2117-09-25.219	94545.219	-1.081	0.96 ± 0.045	7.34E6	2.09E-7	4.88E-2	-8.17
2118-09-27.453	94912.453	-4.537	2.01 ± 0.000	2.23E6	3.66E-11	4.95E-2	-11.93
2119-09-24.768	95274.768	-0.632	1.89 ± 0.008	2.85E7	6.93E-8	4.89E-2	-8.66
2119-09-26.119	95276.119	-3.853	3.52 ± 0.005	2.58E5	1.02E-9	4.91E-2	-10.49
2120-09-23.968	95639.968	-2.322	2.52 ± 0.055	1.60E7	8.60E-9	4.91E-2	-9.57
2121-09-24.939	96005.939	-4.427	0.99 ± 0.003	4.37E6	3.50E-11	4.94E-2	-11.96


Based on 49 optical observations (of which 0 are rejected as outliers) from 2008/09/22.161 to 2008/09/29.273.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 3.58 and 3.61 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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