Asteroids

2009RR help

Last update: 2026-07-30 11:21 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.753

Aphelion (Q)

2.069

Eccentricity (e)

0.466

Inclination (i)

6.1

deg

Orbit period (P)

612.0

Earth MOID

0.00248

U parameter

9.0

Next Earth close approach

Date

2035-01-16

Nominal distance (from Earth center)

0.19153

28653192

Maximum Brightness

26.9

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

20 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2009-09-11

Observatory

University of Arizona 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.410723

1-sigma variation

0.011796

Unit

Eccentricity (e)

Value

0.466455

1-sigma variation

0.001390

Unit

Inclination (i)

Value

6.0974

1-sigma variation

0.0672

Unit

Long. of Ascending Node (Ω)

Value

174.1216

1-sigma variation

0.0106

Unit

Arg. of Perihelion (ω)

Value

256.6248

1-sigma variation

0.9416

Unit

Mean Anomaly (M)

Value

329.12392

1-sigma variation

33.16810

Unit

Perihelion distance

Value

0.752684

1-sigma variation

Unit

Aphelion distance

Value

2.068761

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.243321

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.009552

1-sigma variation

Unit

MOID

Value

0.002481

1-sigma variation

Unit

Orbit Period

Value

612.0133

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.39157E-4	1.64025E-5	7.92590E-4	-1.25181E-4	-1.11072E-2	-3.91267E-1
e	1.64025E-5	1.93339E-6	9.34231E-5	-1.47547E-5	-1.30921E-3	-4.61188E-2
i	7.92590E-4	9.34231E-5	4.51432E-3	-7.12986E-4	-6.32628E-2	-2.22852E0
Ω	-1.25181E-4	-1.47547E-5	-7.12986E-4	1.12618E-4	9.99175E-3	3.51971E-1
ω	-1.11072E-2	-1.30921E-3	-6.32628E-2	9.99175E-3	8.86553E-1	3.12300E1
M	-3.91267E-1	-4.61188E-2	-2.22852E0	3.51971E-1	3.12300E1	1.10012E3

Date of computation: 2026-07-30 11:21 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

25.583

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

20 - 50*

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

6214

Unit

Source

[1]

Normalized RMS of residuals

Value

0.48172

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-09-11.18242

Unit

Source

[2]

Last Observation

Value

2009-09-15.065792

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

35 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

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.

Close Approaches for 2009RR 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	1961-09-30 10:27	> 1 w	0.1298314	0.0138571	0.1151737
EARTH	1966-09-10 09:10	> 1 w	0.0794597	0.0045924	0.2011494
EARTH	1990-02-20 01:02	> 1 w	0.0555946	0.0458980	0.0831566
EARTH	1995-01-20 19:31	> 1 mo	0.1862251	0.0283610	0.0789327
EARTH	2004-10-22 19:05	> 1 w	0.1998349	0.1353465	0.0219158
EARTH	2009-09-16 07:56	< 1 min	0.0072071	0.0071781	0.0000097
EARTH	2014-09-16 22:06	> 1 d	0.0111574	0.0025167	0.0383535
EARTH	2019-10-08 16:42	> 1 mo	0.1577617	0.0234538	0.3336908
EARTH	2035-01-16 22:07	> 1 mo	0.1915348	0.0309214	0.9607397
EARTH	2040-02-13 21:41	> 1 mo	0.0669321	0.0476382	1.1951248
EARTH	2045-02-23 01:10	> 1 mo	0.1177516	0.0464874	1.8022026
EARTH	2076-09-10 10:24	> 1 w	0.0836886	0.0021247	0.3105191
EARTH	2081-09-20 10:46	> 1 w	0.0493097	0.0016976	0.2220272
EARTH	2086-10-20 10:14	> 1 mo	0.1902882	0.0430051	0.3629838
EARTH	2102-01-26 09:08	> 1 mo	0.1710826	0.0322867	1.7688601
EARTH	2107-02-17 14:42	> 1 mo	0.0487868	0.0462920	0.8360438
EARTH	2112-02-26 18:14	> 1 mo	0.1426499	0.0450743	4.4601749

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
308.01946726	249.34699552	0.00248068	MINIMUM
51.14501284	42.67813239	0.04815884	MINIMUM
359.85625634	326.72271300	0.24995434	SADDLE
179.77502664	145.87152078	1.06537139	SADDLE
358.77363754	144.97101751	1.76428332	SADDLE
179.41946955	325.66177134	3.05151239	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2009RR

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2102-09-17.735	89058.735	-0.737	0.22 ± 0.003	1.31E6	6.08E-7	8.44E-1	-6.64
2103-09-18.016	89424.016	-0.080	0.80 ± 0.110	1.71E8	4.92E-9	8.50E-1	-8.74
2103-09-18.043	89424.043	-0.317	0.15 ± 0.003	2.02E6	4.94E-7	8.46E-1	-6.73
2103-09-18.053	89424.053	-0.381	1.30 ± 0.003	1.28E6	7.37E-7	8.47E-1	-6.56
2103-09-18.064	89424.064	-0.317	0.33 ± 0.003	2.94E6	3.31E-7	8.46E-1	-6.91
2103-09-18.067	89424.067	-0.382	1.03 ± 0.003	1.05E6	9.10E-7	8.47E-1	-6.47
2103-09-18.077	89424.077	-0.092	1.07 ± 0.002	1.13E6	5.98E-7	8.48E-1	-6.65
2103-09-18.089	89424.089	0.098	0.08 ± 0.179	3.11E7	3.33E-8	8.53E-1	-7.90
2105-09-17.528	90154.528	-0.295	0.56 ± 0.000	7.52E6	1.22E-7	8.44E-1	-7.35
2108-09-17.338	91250.338	4.017	0.85 ± 0.002	1.06E6	2.38E-10	8.78E-1	-10.06
2108-09-17.346	91250.346	-0.314	0.50 ± 0.001	9.54E5	9.73E-7	8.46E-1	-6.47
2108-09-17.357	91250.357	-0.391	1.19 ± 0.001	3.32E5	1.76E-6	8.47E-1	-6.21
2108-09-17.375	91250.375	-0.036	1.29 ± 0.003	3.31E6	6.35E-8	8.49E-1	-7.65
2108-09-17.397	91250.397	-0.395	0.54 ± 0.002	4.25E6	2.10E-7	8.43E-1	-7.13
2110-09-17.800	91980.800	-0.152	0.80 ± 0.000	3.56E7	2.33E-8	8.45E-1	-8.10
2110-09-17.845	91980.845	-0.215	0.68 ± 0.005	1.48E6	6.12E-7	8.46E-1	-6.68
2110-09-17.846	91980.846	-0.210	0.56 ± 0.002	1.40E6	6.67E-7	8.47E-1	-6.64
2110-09-17.859	91980.859	-0.559	1.18 ± 0.001	5.21E5	7.93E-7	8.44E-1	-6.57
2111-09-18.108	92346.108	-0.181	0.44 ± 0.032	1.51E8	6.51E-9	8.48E-1	-8.66
2114-09-17.789	93441.789	0.180	1.07 ± 0.003	5.29E6	1.15E-7	8.54E-1	-7.42
2114-09-17.790	93441.790	0.182	0.89 ± 0.004	3.72E6	2.06E-7	8.50E-1	-7.17
2115-09-18.100	93807.100	-0.293	0.38 ± 0.004	1.57E6	6.26E-7	8.47E-1	-6.69
2115-09-18.124	93807.124	-4.133	1.01 ± 0.002	1.62E5	8.27E-10	8.17E-1	-9.58
2118-09-17.774	94902.774	0.137	0.56 ± 0.000	1.45E8	6.68E-9	8.50E-1	-8.68
2118-09-17.805	94902.805	0.082	1.26 ± 0.002	1.25E6	2.55E-7	8.51E-1	-7.09
2118-09-17.816	94902.816	-0.105	0.81 ± 0.000	3.65E6	2.81E-7	8.47E-1	-7.05
2119-09-18.020	95268.020	0.188	0.71 ± 0.004	3.44E6	2.54E-7	8.50E-1	-7.10
2120-09-17.370	95633.370	-0.529	1.09 ± 0.003	3.21E6	1.97E-7	8.48E-1	-7.22


Based on 35 optical observations (of which 0 are rejected as outliers) from 2009/09/11.182 to 2009/09/15.066.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.32 and 1.32 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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