Asteroids

612781 2004MW2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.414

Aphelion (Q)

1.876

Eccentricity (e)

0.638

Inclination (i)

35.1

deg

Orbit period (P)

447.7

Earth MOID

0.07102

U parameter

0.0

Next Earth close approach

Date

2042-06-20

Nominal distance (from Earth center)

0.12824

19183777

Maximum Brightness

16.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.3

mag

Diameter

400 - 800*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2004-06-20

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

1.145340

1-sigma variation

2.118E-9

Unit

Eccentricity (e)

Value

0.638371

1-sigma variation

1.869E-7

Unit

Inclination (i)

Value

35.0933

1-sigma variation

2.128E-5

Unit

Long. of Ascending Node (Ω)

Value

96.0952

1-sigma variation

5.605E-6

Unit

Arg. of Perihelion (ω)

Value

50.1792

1-sigma variation

1.562E-5

Unit

Mean Anomaly (M)

Value

221.51509

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.414188

1-sigma variation

Unit

Aphelion distance

Value

1.876491

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.501918

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.129658

1-sigma variation

Unit

MOID

Value

0.071024

1-sigma variation

Unit

Orbit Period

Value

447.7131

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.48616E-18	-1.76116E-16	-2.24980E-16	2.45858E-15	4.16314E-15	-7.11474E-15
e	-1.76116E-16	3.49470E-14	2.31141E-13	-1.26605E-14	-2.46997E-12	-1.32488E-12
i	-2.24980E-16	2.31141E-13	4.52914E-10	-2.54773E-11	-4.07007E-12	-1.01844E-11
Ω	2.45858E-15	-1.26605E-14	-2.54773E-11	3.14126E-11	-3.10635E-11	-3.02783E-12
ω	4.16314E-15	-2.46997E-12	-4.07007E-12	-3.10635E-11	2.44111E-10	1.03129E-10
M	-7.11474E-15	-1.32488E-12	-1.01844E-11	-3.02783E-12	1.03129E-10	1.27852E-10

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

19.313

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

400 - 800*

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

[-]

Download this part as:

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

7682

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.428274

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-06-20.34208

Unit

Source

[2]

Last Observation

Value

2025-07-02.602472

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

182 (1)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2015-06-28

Unit

Source

[3]

Last Observation

Value

2015-06-28

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (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 612781 2004MW2 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	1966-06-19 15:44	< 1 min	0.1444225	0.1444208	0.0000006
EARTH	1977-06-24 20:27	< 1 min	0.0983929	0.0983920	0.0000003
EARTH	2004-06-19 21:10	< 1 s	0.1217552	0.1217548	0.0000001
EARTH	2015-06-25 19:37	< 1 s	0.1025980	0.1025977	0.0000001
EARTH	2042-06-20 05:47	< 1 s	0.1282356	0.1282345	0.0000004
EARTH	2053-06-25 07:56	< 1 min	0.0994441	0.0994428	0.0000005
EARTH	2080-06-21 03:15	< 1 min	0.0897946	0.0897932	0.0000005
EARTH	2091-06-29 13:22	< 1 min	0.1799933	0.1799909	0.0000008
EARTH	2107-06-21 11:02	< 1 min	0.1340947	0.1340922	0.0000008
EARTH	2118-06-28 14:47	< 1 min	0.1370180	0.1370151	0.0000009

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
82.94051795	168.92630510	0.07206717	MINIMUM
312.56330100	324.04231658	0.43392164	MINIMUM
15.23076479	71.60862753	0.68103914	SADDLE
192.93013128	225.06007769	1.08358610	SADDLE
9.64561005	238.25331090	1.38427884	SADDLE
175.86054244	36.68073871	2.79823197	MAXIMUM

Download:

MOID Plots

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