Asteroids

2009WW7 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.805

Aphelion (Q)

1.376

Eccentricity (e)

0.262

Inclination (i)

2.5

deg

Orbit period (P)

416.1

Earth MOID

0.00167

U parameter

6.9

Next Earth close approach

Date

2033-07-27

Nominal distance (from Earth center)

0.1985

29694901

Maximum Brightness

35.9

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

4 - 9*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2009-11-19

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

1.090721

1-sigma variation

0.000087

Unit

Eccentricity (e)

Value

0.262009

1-sigma variation

0.000212

Unit

Inclination (i)

Value

2.5263

1-sigma variation

0.0023

Unit

Long. of Ascending Node (Ω)

Value

57.1144

1-sigma variation

0.0026

Unit

Arg. of Perihelion (ω)

Value

273.7068

1-sigma variation

0.0074

Unit

Mean Anomaly (M)

Value

74.52088

1-sigma variation

0.94857

Unit

Perihelion distance

Value

0.804942

1-sigma variation

Unit

Aphelion distance

Value

1.376500

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.010318

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.020560

1-sigma variation

Unit

MOID

Value

0.001670

1-sigma variation

Unit

Orbit Period

Value

416.0723

1-sigma variation

Unit

U parameter

Value

6.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.63258E-9	1.85118E-8	1.99428E-7	-2.27887E-7	-6.41806E-7	-8.28717E-5
e	1.85118E-8	4.49433E-8	4.83917E-7	-5.52730E-7	-1.56291E-6	-2.00995E-4
i	1.99428E-7	4.83917E-7	5.21374E-6	-5.95451E-6	-1.68016E-5	-2.16532E-3
Ω	-2.27887E-7	-5.52730E-7	-5.95451E-6	6.80417E-6	1.91652E-5	2.47431E-3
ω	-6.41806E-7	-1.56291E-6	-1.68016E-5	1.91652E-5	5.48428E-5	6.96856E-3
M	-8.28717E-5	-2.00995E-4	-2.16532E-3	2.47431E-3	6.96856E-3	8.99791E-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

28.996

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

4 - 9*

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

5813

Unit

Source

[1]

Normalized RMS of residuals

Value

0.714985

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-11-19.23811

Unit

Source

[2]

Last Observation

Value

2009-11-23.23546

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

32 (4)

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 2009WW7 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	1962-05-09 23:26	> 1 w	0.1833700	0.0008401	0.2489744
EARTH	1963-10-04 18:21	> 1 mo	0.1673030	0.0220862	0.0976647
EARTH	1963-11-29 22:13	> 1 mo	0.1932955	0.0169800	0.1695880
EARTH	1971-05-17 06:04	> 1 w	0.0387632	0.0004602	0.1475640
EARTH	1972-11-12 02:09	> 1 w	0.0600973	0.0015150	0.1430711
EARTH	1980-05-17 07:00	> 1 d	0.0205294	0.0003106	0.0207304
EARTH	1981-11-11 05:32	> 1 d	0.0804019	0.0094057	0.0236690
EARTH	2008-05-22 12:54	139.1	0.0588270	0.0549515	0.0012918
EARTH	2009-11-17 13:29	< 1 min	0.0045001	0.0044883	0.0000039
EARTH	2017-10-16 09:56	> 1 d	0.1460434	0.1241869	0.0072941
EARTH	2033-07-27 17:06	> 1 w	0.1984982	0.1815494	0.0056556
EARTH	2041-06-01 11:20	> 1 d	0.0970378	0.0182173	0.0262781
EARTH	2042-11-26 20:09	> 1 d	0.1865785	0.1100053	0.0255245
EARTH	2049-05-20 09:07	1171.8	0.0430994	0.0034358	0.0158419
EARTH	2050-11-19 18:04	880.4	0.0306668	0.0092116	0.0071864
EARTH	2057-05-16 01:57	> 1 d	0.1431684	0.0036069	0.0537811
EARTH	2058-11-14 17:36	> 1 d	0.0494775	0.0009881	0.0675125
EARTH	2066-09-29 18:15	> 1 mo	0.1767827	0.0753058	0.0344185
EARTH	2082-07-09 11:28	> 1 mo	0.1730528	0.0796741	0.0313779
EARTH	2090-05-27 09:22	> 1 d	0.0525156	0.0040199	0.0412426
EARTH	2091-11-25 19:19	> 1 d	0.1478157	0.0629922	0.0282749
EARTH	2098-05-21 00:46	> 1 d	0.0482690	0.0042491	0.0397826
EARTH	2099-11-20 14:11	> 1 d	0.0332244	0.0010046	0.0430200
EARTH	2106-05-18 05:54	> 1 d	0.1355656	0.0043477	0.0752811
EARTH	2107-11-17 02:51	> 1 w	0.0395770	0.0007247	0.1001636
EARTH	2115-10-03 02:46	> 1 d	0.1738792	0.1650191	0.0029539

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
69.15303988	313.36649814	0.00164901	MINIMUM
285.82613147	138.66156423	0.00352160	MINIMUM
356.89550780	225.39507164	0.20992742	SADDLE
178.16201886	46.72360133	0.39104569	SADDLE
356.97861807	45.48612914	1.79327087	SADDLE
178.16211809	226.71266934	2.38688857	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2009WW7

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2050-11-19.673	70129.673	-4.001	0.000	1.61 ± 0.023	2.39E5	5.79E-10	5.56E-3	-10.94
2059-05-18.412	73231.412	1.404	0.000	1.64 ± 0.051	1.50E6	8.94E-8	5.57E-3	-8.87
2064-11-19.063	75243.063	-3.977	0.000	1.21 ± 0.000	3.03E6	1.44E-10	5.56E-3	-11.73
2069-05-17.776	76883.776	1.406	0.000	0.52 ± 0.045	5.66E6	8.44E-8	5.58E-3	-9.01
2070-05-17.997	77248.997	1.400	0.000	0.30 ± 0.000	1.32E8	3.78E-9	5.58E-3	-10.36
2075-11-19.884	79260.884	-4.044	0.000	1.08 ± 0.001	1.75E5	1.94E-9	5.57E-3	-10.71
2081-11-19.201	81452.201	-3.998	0.000	0.93 ± 0.032	2.16E6	1.77E-10	5.55E-3	-11.79
2083-11-19.159	82182.159	1.556	0.000	0.64 ± 0.009	5.68E5	6.55E-7	5.57E-3	-8.24
2083-11-19.434	82182.434	-0.764	0.000	1.01 ± 0.000	8.38E6	1.16E-7	5.56E-3	-8.99
2083-11-19.832	82182.832	-0.622	0.000	1.35 ± 0.000	8.86E4	1.19E-5	5.56E-3	-6.98
2083-11-19.912	82182.912	1.302	0.000	1.42 ± 0.029	1.10E5	3.22E-6	5.56E-3	-7.55
2087-11-19.418	83643.418	1.499	0.000	1.27 ± 0.021	1.57E6	2.62E-7	5.57E-3	-8.66
2087-11-19.688	83643.688	1.372	0.000	0.32 ± 0.027	1.04E8	4.98E-9	5.58E-3	-10.38
2089-11-19.228	84374.228	1.353	0.000	0.05 ± 0.141	1.41E7	3.83E-8	5.56E-3	-9.51
2090-11-19.268	84739.268	1.392	0.000	0.18 ± 0.027	1.04E8	4.88E-9	5.57E-3	-10.41
2096-05-17.417	86745.417	-1.915	0.000	0.07 ± 0.087	2.42E5	8.89E-7	5.56E-3	-8.18
2096-05-17.462	86745.462	-1.010	0.000	0.60 ± 0.084	1.80E6	4.47E-7	5.57E-3	-8.48
2100-11-19.336	88391.336	-3.744	0.000	0.98 ± 0.006	4.88E5	2.13E-9	5.54E-3	-10.83
2100-11-20.088	88392.088	-4.060	0.000	1.56 ± 0.010	1.12E5	2.74E-9	5.55E-3	-10.72
2101-11-19.624	88756.624	-0.847	0.000	1.28 ± 0.000	2.17E7	3.15E-8	5.59E-3	-9.66
2104-05-18.542	89667.542	-0.970	0.000	1.04 ± 0.011	5.54E6	1.21E-7	5.59E-3	-9.09
2104-11-19.489	89852.489	-1.190	0.000	1.43 ± 0.032	1.58E8	2.27E-9	5.59E-3	-10.82
2105-05-18.678	90032.678	-1.008	0.000	0.10 ± 0.127	3.20E7	2.53E-8	5.57E-3	-9.78
2107-05-19.069	90763.069	-1.017	0.000	1.51 ± 0.034	1.03E7	3.53E-8	5.55E-3	-9.64
2107-05-19.128	90763.128	-1.915	0.000	1.23 ± 0.110	1.06E8	1.94E-9	5.57E-3	-10.90
2107-11-20.837	90948.837	0.863	0.000	1.28 ± 0.007	1.22E6	5.01E-7	5.57E-3	-8.50
2107-11-20.850	90948.850	-4.621	0.000	0.87 ± 0.006	1.87E5	1.43E-10	5.54E-3	-12.04
2108-11-20.045	91314.045	1.269	0.000	0.24 ± 0.407	1.25E4	4.66E-5	5.56E-3	-6.53
2111-05-19.063	92224.063	0.406	0.000	1.15 ± 0.053	2.04E7	4.48E-8	5.56E-3	-9.56
2112-11-19.997	92774.997	1.069	0.000	0.92 ± 0.014	1.64E7	3.98E-8	5.55E-3	-9.62
2115-05-19.213	93685.213	-1.921	0.000	1.27 ± 0.028	2.75E6	5.13E-8	5.56E-3	-9.52
2115-05-19.268	93685.268	-1.006	0.000	1.36 ± 0.026	4.00E6	1.21E-7	5.57E-3	-9.15
2115-11-20.636	93870.636	-0.977	0.000	1.43 ± 0.012	1.68E7	2.64E-8	5.57E-3	-9.81
2116-11-19.849	94235.849	-0.600	0.000	0.89 ± 0.035	6.89E6	1.39E-7	5.58E-3	-9.09
2116-11-19.951	94235.951	3.254	1.793	1.69 ± 0.050	1.11E4	1.02E-9	5.45E-3	-11.24
2116-11-20.015	94236.015	-0.577	0.000	0.59 ± 0.009	1.79E5	6.04E-6	5.56E-3	-7.46
2117-05-18.653	94415.653	-1.031	0.000	1.60 ± 0.070	7.24E6	3.30E-8	5.58E-3	-9.72
2117-05-18.659	94415.659	-1.019	0.000	0.67 ± 0.034	5.03E6	1.47E-7	5.56E-3	-9.07
2118-11-20.440	94966.440	1.271	0.000	0.76 ± 0.063	1.41E7	3.81E-8	5.56E-3	-9.67
2119-11-20.217	95331.217	3.477	0.000	0.98 ± 0.063	1.28E7	2.49E-10	5.58E-3	-11.85
2119-11-20.699	95331.699	0.713	0.000	1.57 ± 0.011	3.56E6	1.48E-7	5.55E-3	-9.08
2121-11-20.255	96062.255	-0.470	0.000	1.18 ± 0.006	8.41E7	1.06E-8	5.58E-3	-10.23


Based on 32 optical observations (of which 4 are rejected as outliers) from 2009/11/19.238 to 2009/11/23.235.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.69 and 1.69 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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