Asteroids

311066 2004DC help

Last update: 2025-10-15 15:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.981

Aphelion (Q)

2.286

Eccentricity (e)

0.400

Inclination (i)

19.5

deg

Orbit period (P)

762.6

Earth MOID

0.01089

U parameter

0.0

Next Earth close approach

Date

2029-05-13

Nominal distance (from Earth center)

0.19009

28437798

Maximum Brightness

17.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.3

mag

Diameter

600 - 1300*

Taxonomic type

Rotation period (T)

2.571

Discovery Information

Discovery Date

2004-02-16

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

1.633580

1-sigma variation

5.850E-9

Unit

Eccentricity (e)

Value

0.399624

1-sigma variation

1.964E-8

Unit

Inclination (i)

Value

19.4605

1-sigma variation

1.885E-6

Unit

Long. of Ascending Node (Ω)

Value

74.9026

1-sigma variation

2.570E-6

Unit

Arg. of Perihelion (ω)

Value

156.3558

1-sigma variation

1.039E-5

Unit

Mean Anomaly (M)

Value

124.94320

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.980762

1-sigma variation

Unit

Aphelion distance

Value

2.286399

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.180200

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.011468

1-sigma variation

Unit

MOID

Value

0.010888

1-sigma variation

Unit

Orbit Period

Value

762.6217

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.42252E-17	8.60074E-18	-1.21235E-15	-5.51421E-15	5.32232E-14	-1.24287E-13
e	8.60074E-18	3.85681E-16	-2.74124E-14	-4.63302E-14	4.12887E-14	-3.90688E-14
i	-1.21235E-15	-2.74124E-14	3.55348E-12	2.93433E-12	-3.84454E-12	5.17612E-12
Ω	-5.51421E-15	-4.63302E-14	2.93433E-12	6.60630E-12	-1.46010E-11	2.19439E-11
ω	5.32232E-14	4.12887E-14	-3.84454E-12	-1.46010E-11	1.07869E-10	-2.02758E-10
M	-1.24287E-13	-3.90688E-14	5.17612E-12	2.19439E-11	-2.02758E-10	4.54975E-10

Date of computation: 2025-10-15 15:00 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

2.571

Unit

Source

[1]

Quality

Value

2,B,R

Unit

Source

[1]

Amplitude

Value

0.25

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

18.274

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

600 - 1300*

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

Radar R

Unit

Source

[4]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) R. Behrend Courbes des lumiere, Observatoire de Geneve website 2.) Pravec, P. et al (2016) Icarus 267,267-295. (Binary asteroid population. 3. Secondary rotations and elongations) (..,..)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude
[4]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Taylor, P.A. et al. (2006) CBET HREF="http://www.cbat.eps.harvard.edu/iau/cbet/000500/CBET000535.txt"> 535. (2004 DC) (radar observations and binary asteroid detection) 3.) Taylor, P.A. et al. (2008) ACM2008, 8322. (THE SHAPE, MUTUAL ORBIT, AND TIDAL EVOLUTION OF BINARY NEAR-EARTH ASTEROID 2004 DC)
[5]	EARN	Earth Asteroids Research Node: https://earn.dlr.de

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

7912

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.572335

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-02-16.4482

Unit

Source

[2]

Last Observation

Value

2025-10-15.403928

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

356 (8)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2006-05-29

Unit

Source

[3]

Last Observation

Value

2006-06-03

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 311066 2004DC 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	1983-05-18 18:16	< 1 min	0.1577734	0.1577715	0.0000006
EARTH	2006-06-03 19:56	< 1 s	0.0258613	0.0258613	0.0000000
EARTH	2029-05-13 18:34	< 1 min	0.1900949	0.1900929	0.0000007
EARTH	2054-06-17 05:54	< 1 min	0.1154607	0.1154570	0.0000012
EARTH	2077-06-03 11:13	< 1 min	0.0272373	0.0272358	0.0000005
EARTH	2102-06-12 00:31	< 1 min	0.0470730	0.0470580	0.0000050
EARTH	2125-05-15 06:49	1.5	0.1869744	0.1869466	0.0000093

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
16.00253426	153.70554439	0.01088787	MINIMUM
176.30159673	309.17739526	1.31383860	SADDLE
358.84076247	308.68059066	1.96568479	SADDLE
182.28431595	132.92989523	3.29285251	MAXIMUM

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MOID Plots

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