Asteroids

2009SH2 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.898

Aphelion (Q)

1.085

Eccentricity (e)

0.094

Inclination (i)

6.8

deg

Orbit period (P)

360.5

Earth MOID

0.00036

U parameter

4.9

Next Earth close approach

Date

2082-04-19

Nominal distance (from Earth center)

0.15115

22611441

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

24.9

mag

Diameter

28 - 60*

Taxonomic type

Rotation period (T)

1.260

Discovery Information

Discovery Date

2009-09-18

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.991249

1-sigma variation

0.000005

Unit

Eccentricity (e)

Value

0.094210

1-sigma variation

0.000009

Unit

Inclination (i)

Value

6.8102

1-sigma variation

0.0007

Unit

Long. of Ascending Node (Ω)

Value

6.6551

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

101.7664

1-sigma variation

0.0034

Unit

Mean Anomaly (M)

Value

230.45886

1-sigma variation

0.03946

Unit

Perihelion distance

Value

0.897863

1-sigma variation

Unit

Aphelion distance

Value

1.084634

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.000424

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.033749

1-sigma variation

Unit

MOID

Value

0.000358

1-sigma variation

Unit

Orbit Period

Value

360.4727

1-sigma variation

Unit

U parameter

Value

4.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.04869E-11	-4.07570E-11	-3.11383E-9	3.79885E-10	-1.55834E-8	-1.78610E-7
e	-4.07570E-11	8.13649E-11	6.21811E-9	-7.51452E-10	3.10073E-8	3.55350E-7
i	-3.11383E-9	6.21811E-9	4.75284E-7	-5.73790E-8	2.36901E-6	2.71488E-5
Ω	3.79885E-10	-7.51452E-10	-5.73790E-8	7.11522E-9	-2.88880E-7	-3.31163E-6
ω	-1.55834E-8	3.10073E-8	2.36901E-6	-2.88880E-7	1.18536E-5	1.35860E-4
M	-1.78610E-7	3.55350E-7	2.71488E-5	-3.31163E-6	1.35860E-4	1.55717E-3

Date of computation: 2026-06-04 23:11 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

1.260

Unit

Source

[1]

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

24.869

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

28 - 60*

Unit

Source

[3]

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]	EARN	1.) Ryan, W. UNPUBLISHED
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	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

6110

Unit

Source

[1]

Normalized RMS of residuals

Value

0.419995

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-09-18.76541

Unit

Source

[2]

Last Observation

Value

2009-10-02.44978

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

110 (3)

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

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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 2009SH2 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	1950-09-29 23:33	204.6	0.0094446	0.0074516	0.0093802
EARTH	1951-10-02 05:45	> 1 w	0.0269557	0.0065000	0.1017676
EARTH	1952-10-09 07:04	> 1 w	0.0817792	0.0139960	0.0994330
EARTH	1953-08-09 09:46	> 1 mo	0.1425264	0.0954410	0.0497869
EARTH	1953-12-05 17:45	> 1 mo	0.1290505	0.0998842	0.0306725
EARTH	1954-05-31 04:11	> 1 mo	0.1455636	0.1059212	0.0302956
EARTH	1955-04-06 19:23	> 1 w	0.1028500	0.0226739	0.0599984
EARTH	1956-03-27 00:53	592.9	0.0452455	0.0041216	0.0387889
EARTH	1957-03-27 04:10	22.5	0.0038658	0.0037663	0.0001835
EARTH	1958-03-30 22:14	43.3	0.1047025	0.1018630	0.0009465
EARTH	2008-09-26 03:35	1.3	0.1111968	0.1111219	0.0000250
EARTH	2009-09-30 13:44	< 1 min	0.0073064	0.0073042	0.0000007
EARTH	2010-09-30 05:38	1.6	0.0183080	0.0181739	0.0000447
EARTH	2011-09-28 12:48	< 1 min	0.0769769	0.0769254	0.0000171
EARTH	2012-09-24 20:06	2.4	0.1461859	0.1459612	0.0000749
EARTH	2082-04-19 19:03	214.9	0.1511481	0.1422799	0.0029624
EARTH	2083-04-14 01:32	323.6	0.0842728	0.0764174	0.0026428
EARTH	2084-04-06 12:47	451.8	0.0344389	0.0310560	0.0013118
EARTH	2085-03-30 16:49	603.4	0.0355238	0.0322590	0.0012164
EARTH	2086-03-17 18:33	987.1	0.0741861	0.0690209	0.0017503
EARTH	2087-02-19 05:20	> 1 d	0.1155846	0.1117821	0.0012888
EARTH	2087-08-07 17:01	> 1 d	0.1375903	0.1348488	0.0009255
EARTH	2088-01-05 23:40	> 1 d	0.1382023	0.1377604	0.0001505
EARTH	2088-09-21 07:56	368.4	0.0945226	0.0899195	0.0015360
EARTH	2089-09-28 22:23	38.4	0.0439742	0.0403084	0.0012222
EARTH	2090-09-28 23:01	21.9	0.0050443	0.0038988	0.0003841
EARTH	2091-09-29 22:31	387.9	0.1111064	0.0760520	0.0116878
EARTH	2092-05-17 19:50	> 1 w	0.1456478	0.1248055	0.0085583
EARTH	2093-03-23 19:48	715.2	0.0497942	0.0093121	0.0260748
EARTH	2094-03-25 09:30	273.0	0.0479249	0.0025382	0.0295760
EARTH	2095-03-30 06:11	240.5	0.1643471	0.1035952	0.0202549

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
263.52337728	266.27255487	0.00023390	MINIMUM
80.70613583	92.11767633	0.02997047	MINIMUM
352.71423355	359.14202464	0.14016602	SADDLE
171.48714480	179.37543509	0.14068447	SADDLE
0.64735382	187.74839357	1.91263137	SADDLE
182.57728537	9.69687632	2.06492204	MAXIMUM

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MOID Plots

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Level lines of the squared distance function

2009SH2

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2119-09-28.877	95278.877	3.434	0.000	1.72 ± 0.004	9.40E4	5.29E-8	1.03E0	-7.72	0


Based on 110 optical observations (of which 3 are rejected as outliers) from 2009/09/18.765 to 2009/10/02.450.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 2.84 and 2.84 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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