Asteroids

144901 2004WG1 help

Last update: 2025-10-05 13:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.784

Aphelion (Q)

2.496

Eccentricity (e)

0.522

Inclination (i)

13.0

deg

Orbit period (P)

767.1

Earth MOID

0.05620

U parameter

0.0

Next Earth close approach

Date

2027-04-17

Nominal distance (from Earth center)

0.06492

9712148

Maximum Brightness

15.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.5

mag

Diameter

2240

Taxonomic type

Rotation period (T)

8.060

Discovery Information

Discovery Date

2004-11-19

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

1.639905

1-sigma variation

4.274E-9

Unit

Eccentricity (e)

Value

0.521916

1-sigma variation

2.794E-8

Unit

Inclination (i)

Value

13.0362

1-sigma variation

6.926E-6

Unit

Long. of Ascending Node (Ω)

Value

41.9777

1-sigma variation

1.217E-5

Unit

Arg. of Perihelion (ω)

Value

232.4878

1-sigma variation

1.412E-5

Unit

Mean Anomaly (M)

Value

98.80911

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.784012

1-sigma variation

Unit

Aphelion distance

Value

2.495797

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.757068

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.103960

1-sigma variation

Unit

MOID

Value

0.056199

1-sigma variation

Unit

Orbit Period

Value

767.0547

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.82703E-17	3.78733E-17	1.10098E-15	-4.71176E-15	1.38368E-14	-6.38482E-14
e	3.78733E-17	7.80529E-16	-2.21725E-15	9.82080E-14	-8.13551E-14	-8.38139E-14
i	1.10098E-15	-2.21725E-15	4.79682E-11	-6.74622E-11	6.83795E-11	-4.93142E-12
Ω	-4.71176E-15	9.82080E-14	-6.74622E-11	1.48079E-10	-1.56984E-10	1.88292E-11
ω	1.38368E-14	-8.13551E-14	6.83795E-11	-1.56984E-10	1.99462E-10	-6.47372E-11
M	-6.38482E-14	-8.38139E-14	-4.93142E-12	1.88292E-11	-6.47372E-11	2.35345E-10

Date of computation: 2025-10-05 13:00 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

8.060

Unit

Source

[1]

[2]

Quality

Value

Unit

Source

[2]

Amplitude

Value

0.55

0.65

Unit

mag

Source

[1]

[2]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[1]

Spinvector B

Value

-9

Unit

Source

[1]

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

17.527

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.038

Unit

Source

[4]

Diameter

Value

2240

Unit

Source

[4]

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

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS): Paper 3. Skiff, Brian A et al.
[2]	EARN	1.) Skiff, B.A. et al. (2012) MPB 39, 111-130. (LOWELL OBSERVATORY NEAR-EARTH ASTEROID PHOTOMETRIC SURVEY (NEAPS) - 2008 MAY THROUGH 2008 DECEMBER) (46 NEAs)
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs) 2.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012. 3.) Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; et al. (2012) Astrophys. J. Let. 760, L12.
[5]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Ansdell, M. et al. (2007) DPS 39, 35.07. (Physical Modeling Of Near Earth Asteroid 2004WG1 From Arecibo Observatory Radar Data)

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

0.527547

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-09-22.49325

Unit

Source

[2]

Last Observation

Value

2025-10-04.43066

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

652 (2)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2006-04-11

Unit

Source

[3]

Last Observation

Value

2006-04-13

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

3 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

4 (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 144901 2004WG1 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	1985-04-08 01:34	< 1 min	0.1770335	0.1770321	0.0000005
EARTH	2006-04-15 10:33	< 1 s	0.0826279	0.0826278	0.0000000
EARTH	2027-04-17 18:36	< 1 min	0.0649217	0.0649208	0.0000003
EARTH	2048-04-13 02:53	< 1 min	0.1042261	0.1042230	0.0000010
EARTH	2069-04-08 20:35	< 1 min	0.1713329	0.1713289	0.0000013
EARTH	2115-09-15 18:02	< 1 min	0.1857836	0.1857834	0.0000001

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
320.65435342	107.43706716	0.05619942	MINIMUM
46.10188491	249.19821789	0.19007160	MINIMUM
8.38178772	187.69457137	0.29321335	SADDLE
181.56528933	353.36554620	1.53842087	SADDLE
1.45938203	354.94801414	1.76034767	SADDLE
179.40713024	172.15814017	3.50216389	MAXIMUM

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MOID Plots

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