Asteroids

144411 2004EW9 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.894

Aphelion (Q)

2.941

Eccentricity (e)

0.534

Inclination (i)

8.8

deg

Orbit period (P)

969.6

Earth MOID

0.09145

U parameter

0.0

Next Earth close approach

Date

2028-05-18

Nominal distance (from Earth center)

0.19713

29490849

Maximum Brightness

15.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.5

mag

Diameter

2140

Taxonomic type

Rotation period (T)

49.94

Discovery Information

Discovery Date

2004-03-15

Observatory

Palomar Mountain/NEAT

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

1.917175

1-sigma variation

3.141E-10

Unit

Eccentricity (e)

Value

0.533922

1-sigma variation

1.337E-9

Unit

Inclination (i)

Value

8.7943

1-sigma variation

1.685E-6

Unit

Long. of Ascending Node (Ω)

Value

288.7868

1-sigma variation

6.172E-6

Unit

Arg. of Perihelion (ω)

Value

8.1808

1-sigma variation

6.079E-6

Unit

Mean Anomaly (M)

Value

8.37494

1-sigma variation

5.547E-7

Unit

Perihelion distance

Value

0.893554

1-sigma variation

Unit

Aphelion distance

Value

2.940797

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.121294

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.923374

1-sigma variation

Unit

MOID

Value

0.091454

1-sigma variation

Unit

Orbit Period

Value

969.5968

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.86546E-20	3.32446E-19	-3.05737E-16	1.43082E-15	-1.68370E-15	-1.34915E-17
e	3.32446E-19	1.78710E-18	-9.74556E-16	7.64652E-15	-6.80486E-15	-4.73900E-16
i	-3.05737E-16	-9.74556E-16	2.83901E-12	-2.19785E-12	2.54045E-12	1.01899E-13
Ω	1.43082E-15	7.64652E-15	-2.19785E-12	3.80897E-11	-3.47778E-11	-2.03409E-12
ω	-1.68370E-15	-6.80486E-15	2.54045E-12	-3.47778E-11	3.69592E-11	8.54753E-13
M	-1.34915E-17	-4.73900E-16	1.01899E-13	-2.03409E-12	8.54753E-13	3.07682E-13

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

49.94

Unit

Source

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

0.9

Unit

mag

Source

[3]

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

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.62

16.519

Unit

mag

Source

[4]

[5]

Slope Parameter (G)

Value

0.24

0.15**

Unit

mag

Source

[4]

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.076

Unit

Source

[6]

Diameter

Value

2140

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[7]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	EARN	1.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[4]	EARN	1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[7]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8777

Unit

Source

[1]

Unobserved

Value

229

Unit

Source

[1]

Normalized RMS of residuals

Value

0.377877

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-03-14.30078

Unit

Source

[2]

Last Observation

Value

2025-03-25.215502

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

2563 (11)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2012-07-11

Unit

Source

[3]

Last Observation

Value

2020-06-27

Unit

Source

[3]

Delay (Discarded)

Value

7 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

8 (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 144411 2004EW9 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	1951-05-22 02:37	< 1 s	0.1620267	0.1620265	0.0000001
EARTH	2004-08-26 00:48	< 1 s	0.1161648	0.1161647	0.0000000
EARTH	2012-07-16 21:36	< 1 s	0.1201758	0.1201758	0.0000000
EARTH	2020-06-09 21:15	< 1 s	0.0904129	0.0904129	0.0000000
EARTH	2028-05-18 17:44	< 1 s	0.1971341	0.1971341	0.0000000
EARTH	2073-09-15 15:24	< 1 s	0.1774191	0.1774190	0.0000000
EARTH	2081-08-18 13:29	< 1 min	0.1197942	0.1197941	0.0000000
EARTH	2089-07-09 20:21	< 1 min	0.1173957	0.1173957	0.0000000
EARTH	2097-06-04 00:24	< 1 s	0.0934415	0.0934415	0.0000000

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
337.85464103	155.53905585	0.09046128	MINIMUM
19.62850127	230.00457904	0.11747237	MINIMUM
4.06994305	202.33944998	0.12520085	SADDLE
359.74498230	14.43983064	1.87760155	SADDLE
180.02668557	14.57579018	1.95683261	SADDLE
179.79824253	194.44945871	3.95624788	MAXIMUM

Download:

MOID Plots

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