Asteroids

199003 2005WJ56 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.813

Aphelion (Q)

1.105

Eccentricity (e)

0.152

Inclination (i)

21.6

deg

Orbit period (P)

343.0

Earth MOID

0.02251

U parameter

0.0

Next Earth close approach

Date

2037-07-17

Nominal distance (from Earth center)

0.13426

20085338

Maximum Brightness

24.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.2

mag

Diameter

710

Taxonomic type

Rotation period (T)

4.379

Discovery Information

Discovery Date

2005-11-29

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

0.959012

1-sigma variation

4.027E-10

Unit

Eccentricity (e)

Value

0.152019

1-sigma variation

2.455E-8

Unit

Inclination (i)

Value

21.6164

1-sigma variation

5.358E-6

Unit

Long. of Ascending Node (Ω)

Value

288.0147

1-sigma variation

8.617E-7

Unit

Arg. of Perihelion (ω)

Value

297.6536

1-sigma variation

3.698E-6

Unit

Mean Anomaly (M)

Value

266.88352

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.813223

1-sigma variation

Unit

Aphelion distance

Value

1.104800

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.142920

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.024289

1-sigma variation

Unit

MOID

Value

0.022510

1-sigma variation

Unit

Orbit Period

Value

343.0317

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.62169E-19	7.22974E-18	1.62319E-16	-6.23919E-17	-4.17229E-16	-9.65767E-16
e	7.22974E-18	6.02678E-16	2.54615E-15	-3.70688E-15	-5.00942E-14	2.85666E-14
i	1.62319E-16	2.54615E-15	2.87078E-11	1.86302E-12	-4.97842E-13	-4.68353E-12
Ω	-6.23919E-17	-3.70688E-15	1.86302E-12	7.42597E-13	-8.05856E-13	2.33083E-13
ω	-4.17229E-16	-5.00942E-14	-4.97842E-13	-8.05856E-13	1.36786E-11	-1.16848E-11
M	-9.65767E-16	2.85666E-14	-4.68353E-12	2.33083E-13	-1.16848E-11	2.89140E-11

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

4.379

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.15

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

18.173

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.2

Unit

Source

[3]

Diameter

Value

710

Unit

Source

[3]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.81

0.48

Unit

B-V

V-R

Source

[4]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) href="http://www2.ocn.ne.jp/~hamaten/astlcdata.htm">Hamanowa, H. and Hamanowa, H., (2008) Asteroid Lightcurve Data File 2.) Betzler, A.S & A.B. Novaes (2008) MPB 35, 108-109. (COLORS OF POTENTIALLY HAZARDOUS ASTEROIDS 2005 WJ56 AND 2007 TU24) 3.) R. Behrend Courbes des lumiere, Observatoire de Geneve website
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	EARN	1.) Reddy, V. et al. (2012) Icarus 219, 382-392. (Constraining albedo, diameter and composition of near-Earth asteroids via near-infrared spectroscopy) (1992JE,1992UY4,1999JD6, 1999JM8,2003YE45,2004XP14,2005AD13,2005RC34,2005WJ56, 2005YY93,2007DS84,2008QS11)
[4]	EARN	1.) Betzler, A. et al. (2010) MPB 37, 95-97. (Photometric Observations of the Near-Earth Asteroids 1999 AP10 2000 TO64, 2000 UJ1, 2000 XK44, 2001 MZ7, 2003 QO104, 2005 RQ6, 2005 WJ56, and 2009 UN3)
[5]	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

6940

Unit

Source

[1]

Unobserved

Value

338

Unit

Source

[1]

Normalized RMS of residuals

Value

0.41894

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-11-29.06634

Unit

Source

[2]

Last Observation

Value

2024-11-29.493426

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1308 (12)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2008-01-09

Unit

Source

[3]

Last Observation

Value

2008-01-11

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

5 (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 199003 2005WJ56 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	1960-07-27 02:09	< 1 min	0.1626907	0.1626905	0.0000001
EARTH	1962-01-09 20:34	< 1 s	0.0590749	0.0590746	0.0000001
EARTH	1976-06-30 17:30	< 1 min	0.1864931	0.1864928	0.0000001
EARTH	1977-01-07 19:00	< 1 s	0.1788275	0.1788272	0.0000001
EARTH	1978-01-06 15:45	< 1 s	0.1918391	0.1918387	0.0000001
EARTH	1991-07-15 21:35	< 1 min	0.1353308	0.1353307	0.0000000
EARTH	1993-01-08 22:21	< 1 s	0.0647386	0.0647383	0.0000001
EARTH	2006-07-23 18:42	< 1 s	0.1452715	0.1452714	0.0000000
EARTH	2008-01-10 10:19	< 1 s	0.0279109	0.0279109	0.0000000
EARTH	2022-06-29 14:30	< 1 s	0.1947588	0.1947586	0.0000000
EARTH	2023-01-08 16:14	< 1 s	0.1683315	0.1683312	0.0000001
EARTH	2024-01-07 02:31	< 1 s	0.1995345	0.1995343	0.0000001
EARTH	2037-07-17 07:03	< 1 min	0.1342622	0.1342622	0.0000000
EARTH	2039-01-09 20:23	< 1 s	0.0444380	0.0444377	0.0000001
EARTH	2052-07-26 11:45	< 1 s	0.1588340	0.1588338	0.0000000
EARTH	2054-01-10 01:33	< 1 s	0.0550161	0.0550160	0.0000001
EARTH	2068-07-03 00:42	< 1 min	0.1765289	0.1765286	0.0000001
EARTH	2069-01-07 05:22	< 1 s	0.1975813	0.1975810	0.0000001
EARTH	2070-01-07 10:33	< 1 s	0.1701511	0.1701508	0.0000001
EARTH	2083-07-19 20:25	< 1 min	0.1356197	0.1356196	0.0000000
EARTH	2085-01-09 14:40	< 1 s	0.0319732	0.0319728	0.0000001
EARTH	2098-07-26 12:47	< 1 min	0.1565011	0.1565006	0.0000002
EARTH	2100-01-10 16:12	< 1 s	0.0481455	0.0481446	0.0000003
EARTH	2114-06-30 18:51	< 1 min	0.1951262	0.1951257	0.0000002
EARTH	2115-01-09 18:05	< 1 s	0.1686380	0.1686375	0.0000002

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
251.78741490	6.91266280	0.02248352	MINIMUM
61.66347185	192.82819154	0.13375934	MINIMUM
339.86934859	99.17902494	0.38453303	SADDLE
153.19964164	281.59012687	0.40032052	SADDLE
355.91218895	299.16150303	1.77860415	SADDLE
196.58144245	140.35742401	2.09093581	MAXIMUM

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MOID Plots

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