Asteroids

2008ST help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

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

0.00192

U parameter

7.1

Next Earth close approach

Date

2026-09-27

Nominal distance (from Earth center)

0.09928

14851369

Maximum Brightness

25.4

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.963215

1-sigma variation

0.000129

Unit

Eccentricity (e)

Value

0.126190

1-sigma variation

0.000074

Unit

Inclination (i)

Value

1.8677

1-sigma variation

0.0093

Unit

Long. of Ascending Node (Ω)

Value

187.3845

1-sigma variation

0.2849

Unit

Arg. of Perihelion (ω)

Value

292.3334

1-sigma variation

0.3304

Unit

Mean Anomaly (M)

Value

148.78729

1-sigma variation

0.42920

Unit

Perihelion distance

Value

0.841667

1-sigma variation

Unit

Aphelion distance

Value

1.084764

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.093244

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.006462

1-sigma variation

Unit

MOID

Value

0.001920

1-sigma variation

Unit

Orbit Period

Value

345.2897

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.67370E-8	-9.62877E-9	-1.20296E-6	-3.68557E-5	4.27412E-5	-5.55267E-5
e	-9.62877E-9	5.54498E-9	6.92196E-7	2.12037E-5	-2.45901E-5	3.19448E-5
i	-1.20296E-6	6.92196E-7	8.64654E-5	2.64900E-3	-3.07202E-3	3.99096E-3
Ω	-3.68557E-5	2.12037E-5	2.64900E-3	8.11584E-2	-9.41185E-2	1.22273E-1
ω	4.27412E-5	-2.45901E-5	-3.07202E-3	-9.41185E-2	1.09148E-1	-1.41799E-1
M	-5.55267E-5	3.19448E-5	3.99096E-3	1.22273E-1	-1.41799E-1	1.84216E-1

Date of computation: 2026-03-17 23:26 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

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

6401

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

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
251.38104857	264.17433003	0.00176883	MINIMUM
111.56989870	136.00130842	0.02595218	MINIMUM
179.81156540	198.68275787	0.07463284	SADDLE
1.94067892	20.35134722	0.14539777	SADDLE
3.42288126	201.98912924	1.85855995	SADDLE
182.64624705	21.20811114	2.06917198	MAXIMUM

Download:

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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