Asteroids

141018 2001WC47 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.061

Aphelion (Q)

1.736

Eccentricity (e)

0.241

Inclination (i)

2.9

deg

Orbit period (P)

604.2

Earth MOID

0.07728

U parameter

0.0

Next Earth close approach

Date

2055-04-28

Nominal distance (from Earth center)

0.16648

24904994

Maximum Brightness

17.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

400 - 1000*

Taxonomic type

Rotation period (T)

16.75

Discovery Information

Discovery Date

2001-11-20

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

1.398684

1-sigma variation

1.058E-9

Unit

Eccentricity (e)

Value

0.241089

1-sigma variation

7.123E-9

Unit

Inclination (i)

Value

2.8693

1-sigma variation

1.165E-6

Unit

Long. of Ascending Node (Ω)

Value

91.5969

1-sigma variation

2.733E-5

Unit

Arg. of Perihelion (ω)

Value

101.4696

1-sigma variation

2.520E-5

Unit

Mean Anomaly (M)

Value

84.09314

1-sigma variation

4.833E-6

Unit

Perihelion distance

Value

1.061477

1-sigma variation

Unit

Aphelion distance

Value

1.735890

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.400309

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.238910

1-sigma variation

Unit

MOID

Value

0.077277

1-sigma variation

Unit

Orbit Period

Value

604.1957

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.11987E-18	4.40695E-19	4.80306E-17	9.06278E-15	-7.88432E-15	-4.78788E-15
e	4.40695E-19	5.07365E-17	2.70475E-15	1.09751E-13	-1.11574E-13	-2.89947E-15
i	4.80306E-17	2.70475E-15	1.35665E-12	7.15420E-13	-1.56513E-12	8.41641E-13
Ω	9.06278E-15	1.09751E-13	7.15420E-13	7.47164E-10	-6.86725E-10	-7.31949E-11
ω	-7.88432E-15	-1.11574E-13	-1.56513E-12	-6.86725E-10	6.34996E-10	6.39183E-11
M	-4.78788E-15	-2.89947E-15	8.41641E-13	-7.31949E-11	6.39183E-11	2.33602E-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

16.75

Unit

Source

[2]

Quality

Value

Unit

Source

[2]

Amplitude

Value

0.23

Unit

mag

Source

[2]

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

[1]

Taxonomy (all)

Value

Unit

Source

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.961

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

400 - 1000*

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

Visual S

Radar R

Unit

Source

[1]

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Kuroda, D. et al. (2014) PASJ 66, 51. (Visible-wavelength spectroscopy of subkilometer-sized near-Earth asteroids with a low delta-v) (89136,136923,141018,163000,214869, 253062,311925,363305,2009SC15,2009SQ104,2011BT15)
[2]	EARN	1.) Warner, B.D. (2012) MPB 39, 245-252. (ASTEROID LIGHTCURVE ANALYSIS AT THE PALMER DIVIDE OBSERVATORY: 2012 MARCH - JUNE) (..141018,326732,2011WV134,2012AA11,2012DO,..)
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude
[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

12157

Unit

Source

[1]

Unobserved

Value

190

Unit

Source

[1]

Normalized RMS of residuals

Value

0.388072

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1991-12-07.21319

Unit

Source

[2]

Last Observation

Value

2025-03-20.14926

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1697 (4)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2012-02-23

Unit

Source

[3]

Last Observation

Value

2012-04-27

Unit

Source

[3]

Delay (Discarded)

Value

4 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

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 141018 2001WC47 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	1969-04-23 11:26	< 1 min	0.1284845	0.1284839	0.0000002
EARTH	1974-03-25 07:09	< 1 min	0.1423897	0.1423889	0.0000003
EARTH	2012-04-19 21:30	< 1 s	0.1013327	0.1013327	0.0000000
EARTH	2017-03-23 04:01	< 1 s	0.1659907	0.1659905	0.0000000
EARTH	2055-04-28 18:47	< 1 min	0.1664796	0.1664788	0.0000003
EARTH	2060-04-02 01:25	< 1 min	0.0985015	0.0985010	0.0000002
MARS	2065-07-26 08:24	< 1 s	0.0138287	0.0138283	0.0000001
EARTH	2098-04-21 03:37	< 1 min	0.0987660	0.0987653	0.0000002
EARTH	2103-03-24 18:55	< 1 min	0.1763677	0.1763666	0.0000003

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
6.34931139	98.09112106	0.07828824	MINIMUM
181.98613843	272.93543460	0.73935985	SADDLE
3.46411828	274.39745869	2.05998641	SADDLE
182.21920011	93.11879438	2.73549649	MAXIMUM

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MOID Plots

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