Asteroids

469896 2005WC1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.719

Aphelion (Q)

2.082

Eccentricity (e)

0.487

Inclination (i)

20.0

deg

Orbit period (P)

605.4

Earth MOID

0.01396

U parameter

0.0

Next Earth close approach

Date

2034-06-06

Nominal distance (from Earth center)

0.12668

18950791

Maximum Brightness

18.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.6

mag

Diameter

200

Taxonomic type

Rotation period (T)

2.5

Discovery Information

Discovery Date

2005-11-21

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

1.400506

1-sigma variation

3.033E-9

Unit

Eccentricity (e)

Value

0.486568

1-sigma variation

1.480E-7

Unit

Inclination (i)

Value

19.9810

1-sigma variation

1.777E-5

Unit

Long. of Ascending Node (Ω)

Value

264.9390

1-sigma variation

3.053E-6

Unit

Arg. of Perihelion (ω)

Value

256.8106

1-sigma variation

2.783E-5

Unit

Mean Anomaly (M)

Value

340.33980

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.719064

1-sigma variation

Unit

Aphelion distance

Value

2.081947

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.185099

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.022166

1-sigma variation

Unit

MOID

Value

0.013963

1-sigma variation

Unit

Orbit Period

Value

605.3767

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.19635E-18	1.47187E-16	5.17892E-15	-3.31793E-16	2.69249E-14	-4.87309E-14
e	1.47187E-16	2.19025E-14	1.06511E-12	-2.38093E-14	4.07235E-12	-8.71736E-13
i	5.17892E-15	1.06511E-12	3.15799E-10	-3.45188E-11	2.35976E-10	-3.00464E-11
Ω	-3.31793E-16	-2.38093E-14	-3.45188E-11	9.31961E-12	-1.33179E-11	1.98909E-13
ω	2.69249E-14	4.07235E-12	2.35976E-10	-1.33179E-11	7.74454E-10	-1.61235E-10
M	-4.87309E-14	-8.71736E-13	-3.00464E-11	1.98909E-13	-1.61235E-10	2.60030E-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

2.5

2.582

Unit

Source

[1]

[2]

Quality

Value

Unit

Source

[1]

[2]

Amplitude

Value

2.0

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

20.595

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.11

Unit

Source

[4]

Diameter

Value

200

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

[6]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Higley, S. et al. (2008) MPB 35, 175-177. ("DO WHAT YOU CAN PHOTOMETRY": UNFILTERED PHOTOMETRY OF NEOS 2005 PJ2, 2005 WC1, AND 2006 GY2)
[2]	EARN	1.) Miles, R. (2008) J. Brit. Astron. Assoc. 118, 187-198.
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	EARN	1.) Trilling, D.E. et al. (2010) Astron. J. 140, 770-784. (EXPLORENEOs. I. DESCRIPTION AND FIRST RESULTS FROM THE WARM SPITZER NEAR-EARTH OBJECT SURVEY) (diameters & albedos for 101 NEOs)
[5]	EARN	1.) Lawrence, K.J. et al. (2018) Icarus 300, 12-20. (Arecibo and Goldstone radar images of near-Earth Asteroid (469896) 2005 WC1)
[6]	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

6802

Unit

Source

[1]

Unobserved

Value

476

Unit

Source

[1]

Normalized RMS of residuals

Value

0.491355

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-11-21.31647

Unit

Source

[2]

Last Observation

Value

2024-07-06.01273

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

223 (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

2005-12-14

Unit

Source

[3]

Last Observation

Value

2005-12-15

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

4 (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 469896 2005WC1 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	1961-06-06 05:35	< 1 min	0.1363740	0.1363714	0.0000009
EARTH	1966-06-01 23:06	< 1 min	0.1049705	0.1049698	0.0000002
EARTH	1971-05-29 09:31	< 1 min	0.1781646	0.1781625	0.0000007
EARTH	2000-12-21 01:52	< 1 s	0.1002420	0.1002416	0.0000001
EARTH	2005-12-14 11:49	< 1 s	0.0202420	0.0202420	0.0000000
EARTH	2010-12-05 21:51	< 1 s	0.1847886	0.1847882	0.0000001
EARTH	2034-06-06 12:18	< 1 min	0.1266782	0.1266761	0.0000007
EARTH	2039-05-31 16:57	< 1 min	0.1253739	0.1253724	0.0000005
EARTH	2063-12-21 13:50	< 1 min	0.0957380	0.0957344	0.0000012
EARTH	2068-12-11 16:28	< 1 min	0.0650069	0.0650036	0.0000011
EARTH	2092-06-09 17:23	< 1 min	0.1911724	0.1911680	0.0000015
EARTH	2097-06-03 02:37	< 1 min	0.0943238	0.0943232	0.0000002
EARTH	2102-05-29 16:56	< 1 min	0.1977163	0.1977092	0.0000024
EARTH	2121-12-24 22:49	< 1 min	0.1358708	0.1358555	0.0000051

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
308.55699983	341.25827780	0.01406018	MINIMUM
60.68871181	149.63008174	0.09796871	MINIMUM
6.20310254	68.61034133	0.39974561	SADDLE
182.85679880	240.90246822	1.18051060	SADDLE
3.26977783	243.35377550	1.70217533	SADDLE
179.77095017	58.96882517	3.03475565	MAXIMUM

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MOID Plots

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