Asteroids

2010WC9 help

Last update: 2026-08-28 12:45 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.765

Aphelion (Q)

1.373

Eccentricity (e)

0.284

Inclination (i)

17.7

deg

Orbit period (P)

403.7

Earth MOID

0.00125

U parameter

2.5

Next Earth close approach

Date

2030-11-22

Nominal distance (from Earth center)

0.04712

7049399

Maximum Brightness

21.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.6

mag

Diameter

50 - 110*

Taxonomic type

Rotation period (T)

0.1847

Discovery Information

Discovery Date

2010-11-30

Observatory

University of Arizona Mt. Lemmon Survey

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.068947

1-sigma variation

1.492E-7

Unit

Eccentricity (e)

Value

0.284138

1-sigma variation

1.240E-7

Unit

Inclination (i)

Value

17.6804

1-sigma variation

1.662E-5

Unit

Long. of Ascending Node (Ω)

Value

54.5977

1-sigma variation

5.824E-6

Unit

Arg. of Perihelion (ω)

Value

275.9523

1-sigma variation

3.431E-5

Unit

Mean Anomaly (M)

Value

43.91926

1-sigma variation

0.00054

Unit

Perihelion distance

Value

0.765218

1-sigma variation

Unit

Aphelion distance

Value

1.372675

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.034790

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.001773

1-sigma variation

Unit

MOID

Value

0.001254

1-sigma variation

Unit

Orbit Period

Value

403.6757

1-sigma variation

Unit

U parameter

Value

2.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.22606E-14	-1.32200E-14	1.89688E-12	6.48707E-13	-4.96957E-12	-8.04999E-11
e	-1.32200E-14	1.53667E-14	-1.11931E-12	-5.01798E-13	3.65900E-12	4.81176E-11
i	1.89688E-12	-1.11931E-12	2.76088E-10	4.60590E-11	-4.23693E-10	-6.84845E-9
Ω	6.48707E-13	-5.01798E-13	4.60590E-11	3.39132E-11	-1.52572E-10	-2.36553E-9
ω	-4.96957E-12	3.65900E-12	-4.23693E-10	-1.52572E-10	1.17726E-9	1.79966E-8
M	-8.04999E-11	4.81176E-11	-6.84845E-9	-2.36553E-9	1.79966E-8	2.91138E-7

Date of computation: 2026-08-28 12:45 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

0.1847

Unit

Source

[1]

Quality

Value

2,T

Unit

Source

[1]

Amplitude

Value

0.95

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

23.627

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

50 - 110*

Unit

Source

[3]

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]	EARN	1.) Warner, B.D. (2018) MPB 45, 366-379. (Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2018 April-June)(39 NEAs)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

2723

Unit

Source

[1]

Unobserved

Value

3045

Unit

Source

[1]

Normalized RMS of residuals

Value

0.310101

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2010-11-30.08059

Unit

Source

[2]

Last Observation

Value

2018-05-15.36169

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

235 (0)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2010WC9 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1953-05-12 03:29	15.5	0.0833605	0.0825207	0.0002799
EARTH	1972-05-20 23:29	2.5	0.1402942	0.1401181	0.0000587
EARTH	1973-11-18 00:25	1.6	0.0080247	0.0079727	0.0000174
EARTH	1981-05-19 20:07	< 1 min	0.0973309	0.0973199	0.0000037
EARTH	1982-11-17 20:41	< 1 min	0.0067283	0.0067270	0.0000004
EARTH	1990-05-14 04:56	< 1 min	0.0383145	0.0383108	0.0000012
EARTH	1991-11-09 20:54	< 1 min	0.1870777	0.1870751	0.0000009
EARTH	2010-11-20 20:57	< 1 s	0.0613582	0.0613580	0.0000001
EARTH	2018-05-15 22:04	< 1 s	0.0013567	0.0013567	0.0000000
EARTH	2030-11-22 10:46	1.1	0.0471223	0.0470805	0.0000139
EARTH	2039-05-17 20:06	< 1 min	0.0394707	0.0394248	0.0000153
EARTH	2049-05-08 05:54	< 1 min	0.1842383	0.1842018	0.0000122
EARTH	2061-11-18 19:11	3.1	0.0364385	0.0363451	0.0000311
EARTH	2070-05-15 09:11	3.1	0.0162566	0.0160901	0.0000555
EARTH	2081-05-22 00:37	12.6	0.1835682	0.1818750	0.0005644
EARTH	2082-11-13 22:07	55.4	0.1221180	0.1202114	0.0006359
EARTH	2093-11-24 20:09	80.2	0.0896206	0.0861939	0.0011450
EARTH	2102-05-15 12:41	63.6	0.0404146	0.0370036	0.0011371
EARTH	2113-05-20 14:33	58.5	0.1008758	0.0970392	0.0012789
EARTH	2125-11-19 09:59	301.4	0.0516200	0.0425808	0.0031790

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
280.86578556	129.60762364	0.00125351	MINIMUM
71.01447539	314.08899071	0.02539020	MINIMUM
355.62658058	221.16420448	0.36623800	SADDLE
176.34450674	43.07915473	0.52454979	SADDLE
356.72239424	42.70815906	1.73301650	SADDLE
178.97879636	225.11234789	2.35700501	MAXIMUM

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MOID Plots

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