Asteroids

2009DD45 help

Last update: 2025-07-29 02:36 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.987

Aphelion (Q)

1.495

Eccentricity (e)

0.205

Inclination (i)

13.7

deg

Orbit period (P)

504.9

Earth MOID

0.00011

U parameter

4.3

Next Earth close approach

Date

2027-02-14

Nominal distance (from Earth center)

0.18603

27829961

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.8

mag

Diameter

Taxonomic type

Rotation period (T)

1.200

Discovery Information

Discovery Date

2009-02-27

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.240938

1-sigma variation

0.000003

Unit

Eccentricity (e)

Value

0.204918

1-sigma variation

0.000002

Unit

Inclination (i)

Value

13.7436

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

161.8977

1-sigma variation

9.387E-6

Unit

Arg. of Perihelion (ω)

Value

13.9723

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

243.06599

1-sigma variation

0.01515

Unit

Perihelion distance

Value

0.986647

1-sigma variation

Unit

Aphelion distance

Value

1.495228

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.000119

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.475875

1-sigma variation

Unit

MOID

Value

0.000114

1-sigma variation

Unit

Orbit Period

Value

504.9210

1-sigma variation

Unit

U parameter

Value

4.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.84288E-12	5.09011E-12	1.77263E-10	2.62755E-11	-2.62330E-10	-4.24243E-8
e	5.09011E-12	3.30468E-12	1.15172E-10	1.70536E-11	-1.68304E-10	-2.75350E-8
i	1.77263E-10	1.15172E-10	4.27753E-9	5.96362E-10	-5.71750E-9	-9.59010E-7
Ω	2.62755E-11	1.70536E-11	5.96362E-10	8.81156E-11	-8.77862E-10	-1.42132E-7
ω	-2.62330E-10	-1.68304E-10	-5.71750E-9	-8.77862E-10	1.20924E-8	1.41691E-6
M	-4.24243E-8	-2.75350E-8	-9.59010E-7	-1.42132E-7	1.41691E-6	2.29486E-4

Date of computation: 2025-07-29 02:36 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

1.200

Unit

Source

[2]

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

[1]

Taxonomy (all)

Value

Unit

Source

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

25.769

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[-]

Diameter

Value

Unit

Source

[1]

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.) Binzel, R.P. et al. (2009) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/09000/09024.html"> 9024. (2009 DD_45)
[2]	EARN	1.) Ryan, W. UNPUBLISHED
[3]	ESA Aegis	ESA orbit determination and impact monitoring system

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

6007

Unit

Source

[1]

Normalized RMS of residuals

Value

0.41824

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-02-27.51724

Unit

Source

[2]

Last Observation

Value

2009-03-06.21668

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

102 (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

Close Approaches for 2009DD45 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	1973-03-29 07:12	19.1	0.1865225	0.1861167	0.0001353
EARTH	1984-02-21 22:23	69.2	0.0750240	0.0737062	0.0004393
EARTH	2009-03-02 13:44	< 1 s	0.0004828	0.0004828	0.0000000
EARTH	2027-02-14 21:53	32.1	0.1860318	0.1848100	0.0004073
EARTH	2038-03-21 23:29	80.9	0.1522543	0.1506679	0.0005289
EARTH	2056-02-29 16:51	74.5	0.0165575	0.0150053	0.0005174
EARTH	2067-03-04 00:16	> 1 d	0.0085179	0.0007277	0.0099295
EARTH	2092-02-25 23:08	> 1 mo	0.0547436	0.0024682	1.5160918
EARTH	2110-03-13 12:23	> 1 mo	0.0832344	0.0095528	2.3686147

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
348.62829959	58.85539475	0.00011413	MINIMUM
195.85328116	266.50867048	0.50206575	SADDLE
7.20336622	260.96545411	1.98880991	SADDLE
181.25419959	74.84426181	2.48953583	MAXIMUM

Download:

MOID Plots

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