Asteroids

2009UG help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.492

Aphelion (Q)

1.084

Eccentricity (e)

0.375

Inclination (i)

5.0

deg

Orbit period (P)

255.5

Earth MOID

0.01210

U parameter

0.0

Next Earth close approach

Date

2030-10-02

Nominal distance (from Earth center)

0.03306

4945022

Maximum Brightness

17.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.5

mag

Diameter

50 - 120*

Taxonomic type

Rotation period (T)

5.880

Discovery Information

Discovery Date

2009-10-16

Observatory

Catalina Sky 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

0.788024

1-sigma variation

6.054E-10

Unit

Eccentricity (e)

Value

0.375423

1-sigma variation

3.120E-8

Unit

Inclination (i)

Value

5.0204

1-sigma variation

5.129E-6

Unit

Long. of Ascending Node (Ω)

Value

13.6905

1-sigma variation

6.617E-6

Unit

Arg. of Perihelion (ω)

Value

201.8934

1-sigma variation

6.160E-6

Unit

Mean Anomaly (M)

Value

147.13445

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.492182

1-sigma variation

Unit

Aphelion distance

Value

1.083867

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.038940

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.499191

1-sigma variation

Unit

MOID

Value

0.012097

1-sigma variation

Unit

Orbit Period

Value

255.5100

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.66499E-19	-1.06027E-17	1.60665E-15	-8.39026E-16	-2.38063E-16	1.82689E-15
e	-1.06027E-17	9.73737E-16	-4.57383E-14	6.40086E-14	4.47919E-14	-2.51769E-13
i	1.60665E-15	-4.57383E-14	2.63051E-11	-3.05080E-11	2.45699E-11	9.80938E-12
Ω	-8.39026E-16	6.40086E-14	-3.05080E-11	4.37891E-11	-3.47116E-11	-1.93967E-11
ω	-2.38063E-16	4.47919E-14	2.45699E-11	-3.47116E-11	3.79447E-11	-9.31345E-12
M	1.82689E-15	-2.51769E-13	9.80938E-12	-1.93967E-11	-9.31345E-12	6.87938E-11

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

5.880

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.38

Unit

mag

Source

[1]

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

23.459

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

50 - 120*

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

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Warner, B.D. (2017) Minor Planet Bul. 44, 98-107.
[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

5114

Unit

Source

[1]

Unobserved

Value

731

Unit

Source

[1]

Normalized RMS of residuals

Value

0.596218

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-10-16.22207

Unit

Source

[2]

Last Observation

Value

2023-10-17.257142

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

274 (61)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2023-09-29

Unit

Source

[3]

Last Observation

Value

2023-10-03

Unit

Source

[3]

Delay (Discarded)

Value

4 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

3 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

7 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2009UG 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	1955-10-10 09:25	< 1 min	0.0669151	0.0669147	0.0000001
EARTH	1962-09-29 15:00	< 1 s	0.0144388	0.0144387	0.0000000
VENUS	1963-04-27 12:18	< 1 s	0.0198814	0.0198811	0.0000001
EARTH	1967-12-01 21:40	< 1 s	0.1793474	0.1793466	0.0000003
EARTH	1969-09-27 05:43	< 1 s	0.0524026	0.0524018	0.0000003
EARTH	1974-12-02 20:04	< 1 s	0.1122417	0.1122407	0.0000003
EARTH	1976-09-27 07:36	< 1 s	0.1328673	0.1328664	0.0000003
VENUS	1977-02-15 17:19	< 1 min	0.0497213	0.0497201	0.0000004
EARTH	1981-12-01 05:06	< 1 s	0.0718693	0.0718689	0.0000001
EARTH	1983-09-29 16:08	< 1 s	0.1962663	0.1962658	0.0000002
EARTH	1988-11-26 07:03	< 1 s	0.0725040	0.0725038	0.0000001
MERCURY	1989-11-12 18:50	< 1 s	0.0483007	0.0483006	0.0000000
VENUS	1993-06-20 03:16	< 1 s	0.0279493	0.0279490	0.0000001
EARTH	1995-11-13 21:11	< 1 min	0.0938634	0.0938632	0.0000000
VENUS	1998-05-20 08:05	< 1 s	0.0441235	0.0441232	0.0000001
EARTH	2002-10-24 12:03	< 1 min	0.0948043	0.0948042	0.0000000
EARTH	2009-10-07 07:05	< 1 s	0.0581919	0.0581918	0.0000000
VENUS	2012-03-11 18:34	< 1 s	0.0446625	0.0446622	0.0000001
EARTH	2016-09-29 21:38	< 1 s	0.0163421	0.0163420	0.0000000
MERCURY	2021-06-04 11:35	< 1 min	0.0485938	0.0485938	0.0000000
EARTH	2023-09-30 13:25	< 1 s	0.0157018	0.0157018	0.0000000
EARTH	2030-10-02 17:11	< 1 s	0.0330554	0.0330553	0.0000000
EARTH	2037-10-14 05:27	< 1 min	0.0772340	0.0772339	0.0000000
MERCURY	2043-02-03 14:12	< 1 s	0.0480539	0.0480538	0.0000000
EARTH	2044-10-27 23:17	< 1 min	0.0965859	0.0965858	0.0000000
MERCURY	2050-02-01 03:58	< 1 s	0.0487605	0.0487605	0.0000000
EARTH	2051-11-12 13:00	< 1 min	0.0933797	0.0933796	0.0000000
VENUS	2054-05-15 16:36	< 1 s	0.0166512	0.0166510	0.0000001
EARTH	2058-11-21 18:56	< 1 min	0.0819739	0.0819738	0.0000001
EARTH	2065-11-26 11:00	< 1 min	0.0735152	0.0735150	0.0000001
EARTH	2072-11-29 06:13	< 1 min	0.0710552	0.0710550	0.0000001
EARTH	2074-09-29 09:47	< 1 min	0.1979031	0.1979010	0.0000007
VENUS	2078-08-20 12:47	< 1 min	0.0375921	0.0375907	0.0000004
EARTH	2079-12-01 12:17	< 1 min	0.0748912	0.0748905	0.0000002
EARTH	2081-09-28 10:33	< 1 min	0.1649927	0.1649905	0.0000007
MERCURY	2086-06-14 01:28	< 1 min	0.0466495	0.0466493	0.0000001
EARTH	2086-12-02 15:27	< 1 s	0.0984346	0.0984329	0.0000006
EARTH	2088-09-27 09:44	< 1 s	0.1175864	0.1175840	0.0000008
EARTH	2093-12-02 06:54	< 1 s	0.1360402	0.1360385	0.0000006
VENUS	2094-01-06 16:46	< 1 min	0.0326369	0.0326366	0.0000001
EARTH	2095-09-27 22:37	< 1 s	0.0673476	0.0673455	0.0000007
EARTH	2100-12-02 05:35	< 1 min	0.1823390	0.1823367	0.0000008
EARTH	2102-09-29 14:14	< 1 min	0.0250901	0.0250881	0.0000007
VENUS	2105-06-06 05:58	< 1 s	0.0413003	0.0412995	0.0000002
EARTH	2107-12-02 21:51	< 1 min	0.1907803	0.1907794	0.0000003
EARTH	2109-09-29 04:25	< 1 min	0.0281911	0.0281891	0.0000006
EARTH	2114-12-03 17:41	< 1 min	0.1574514	0.1574490	0.0000008
EARTH	2116-09-28 08:08	< 1 s	0.0712637	0.0712610	0.0000009
EARTH	2121-12-04 03:09	< 1 s	0.1206510	0.1206496	0.0000005
EARTH	2123-09-29 10:58	< 1 min	0.1158692	0.1158677	0.0000005

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
137.15173341	264.68478229	0.01231009	MINIMUM
225.02119658	324.98510324	0.07031296	MINIMUM
186.57346804	298.45143559	0.09836737	SADDLE
5.04804618	119.06997130	0.51559374	SADDLE
4.40300739	298.12685895	1.48472106	SADDLE
181.74837277	115.23717938	2.09016741	MAXIMUM

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MOID Plots

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