Asteroids

2004OD4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.990

Aphelion (Q)

3.085

Eccentricity (e)

0.514

Inclination (i)

4.4

deg

Orbit period (P)

1062.3

Earth MOID

0.00088

U parameter

8.4

Next Earth close approach

Date

2036-07-02

Nominal distance (from Earth center)

0.02818

4216287

Maximum Brightness

25.1

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

10 - 23*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2004-07-17

Observatory

Lincoln Laboratory ETS, New Mexico

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

2.037447

1-sigma variation

0.003102

Unit

Eccentricity (e)

Value

0.514184

1-sigma variation

0.000938

Unit

Inclination (i)

Value

4.3588

1-sigma variation

0.0048

Unit

Long. of Ascending Node (Ω)

Value

294.5536

1-sigma variation

0.0111

Unit

Arg. of Perihelion (ω)

Value

336.1119

1-sigma variation

0.0009

Unit

Mean Anomaly (M)

Value

129.94264

1-sigma variation

6.43749

Unit

Perihelion distance

Value

0.989825

1-sigma variation

Unit

Aphelion distance

Value

3.085069

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.001885

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.843945

1-sigma variation

Unit

MOID

Value

0.000877

1-sigma variation

Unit

Orbit Period

Value

1062.2529

1-sigma variation

Unit

U parameter

Value

8.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.61992E-6	2.90861E-6	1.48384E-5	-3.43992E-5	2.67286E-6	-1.99665E-2
e	2.90861E-6	8.79424E-7	4.48642E-6	-1.04007E-5	8.08138E-7	-6.03693E-3
i	1.48384E-5	4.48642E-6	2.28936E-5	-5.30607E-5	4.12001E-6	-3.07977E-2
Ω	-3.43992E-5	-1.04007E-5	-5.30607E-5	1.23006E-4	-9.55731E-6	7.13970E-2
ω	2.67286E-6	8.08138E-7	4.12001E-6	-9.55731E-6	7.51222E-7	-5.54764E-3
M	-1.99665E-2	-6.03693E-3	-3.07977E-2	7.13970E-2	-5.54764E-3	4.14413E1

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

27.034

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

10 - 23*

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

7726

Unit

Source

[1]

Normalized RMS of residuals

Value

0.480744

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-07-17.34882

Unit

Source

[2]

Last Observation

Value

2004-07-21.69793

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

33 (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 2004OD4 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	1995-05-09 15:32	> 1 mo	0.1462273	0.0508168	1.0510991
EARTH	1998-06-05 09:57	> 1 mo	0.0417054	0.0413979	0.0305929
EARTH	2001-07-14 21:01	> 1 w	0.0086400	0.0005207	0.0276464
EARTH	2004-07-16 05:09	< 1 min	0.0011075	0.0011023	0.0000017
EARTH	2036-07-02 08:26	> 1 mo	0.0281841	0.0053374	0.1890184
EARTH	2068-07-20 06:17	> 1 mo	0.0273260	0.0045888	2.2122669
EARTH	2106-08-06 01:19	> 1 mo	0.1216250	0.0074242	53.0946576
EARTH	2109-05-14 04:02	> 1 mo	0.1468440	0.0601164	45.2679599

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
13.18175463	191.65828624	0.00140375	MINIMUM
0.20399221	348.64092159	1.97276060	SADDLE
180.00270023	348.52580287	2.10148914	SADDLE
180.15190986	168.61159592	4.10037871	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2004OD4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2113-07-17.228	93014.228	-4.879	0.000	1.25 ± 0.003	2.13E5	3.21E-11	8.26E-2	-11.78	0


Based on 33 optical observations (of which 0 are rejected as outliers) from 2004/07/17.349 to 2004/07/21.698.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.66 and 1.66 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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Download Impactor Table as: