Asteroids

2018WC2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.561

Aphelion (Q)

1.130

Eccentricity (e)

0.337

Inclination (i)

7.2

deg

Orbit period (P)

283.9

Earth MOID

0.00532

U parameter

7.6

Next Earth close approach

Date

2025-12-03

Nominal distance (from Earth center)

0.03066

4586446

Maximum Brightness

19.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.9

mag

Diameter

28 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-11-29

Observatory

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.845284

1-sigma variation

0.000158

Unit

Eccentricity (e)

Value

0.336636

1-sigma variation

0.000622

Unit

Inclination (i)

Value

7.2394

1-sigma variation

0.0173

Unit

Long. of Ascending Node (Ω)

Value

250.1050

1-sigma variation

0.0044

Unit

Arg. of Perihelion (ω)

Value

318.0458

1-sigma variation

0.0138

Unit

Mean Anomaly (M)

Value

236.86567

1-sigma variation

0.95982

Unit

Perihelion distance

Value

0.560731

1-sigma variation

Unit

Aphelion distance

Value

1.129838

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.416107

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.013696

1-sigma variation

Unit

MOID

Value

0.005322

1-sigma variation

Unit

Orbit Period

Value

283.8590

1-sigma variation

Unit

U parameter

Value

7.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.49591E-8	-9.82420E-8	-2.73675E-6	7.00930E-7	-2.18262E-6	-1.51635E-4
e	-9.82420E-8	3.87048E-7	1.07840E-5	-2.76318E-6	8.57840E-6	5.96918E-4
i	-2.73675E-6	1.07840E-5	3.00478E-4	-7.69984E-5	2.38903E-4	1.66288E-2
Ω	7.00930E-7	-2.76318E-6	-7.69984E-5	1.97355E-5	-6.11447E-5	-4.25915E-3
ω	-2.18262E-6	8.57840E-6	2.38903E-4	-6.11447E-5	1.91316E-4	1.32579E-2
M	-1.51635E-4	5.96918E-4	1.66288E-2	-4.25915E-3	1.32579E-2	9.21249E-1

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

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

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

24.918

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

28 - 60*

Unit

Source

[2]

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]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

2528

Unit

Source

[1]

Normalized RMS of residuals

Value

0.626711

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-11-29.06208

Unit

Source

[2]

Last Observation

Value

2018-12-06.09954

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (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

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

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 2018WC2 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	1952-12-04 16:31	519.6	0.0494022	0.0043983	0.0777064
EARTH	1955-09-09 18:48	> 1 d	0.1613312	0.1287496	0.0219598
EARTH	1959-12-05 10:45	390.5	0.0243537	0.0041463	0.0267058
EARTH	1962-09-09 23:39	572.3	0.1599568	0.1253249	0.0213050
EARTH	1966-12-05 02:57	728.8	0.0702548	0.0051581	0.0501342
EARTH	1969-09-09 07:46	262.8	0.1335320	0.1258644	0.0157352
EARTH	1973-12-03 16:16	> 1 d	0.1360900	0.0065205	0.0506692
EARTH	1976-09-11 04:17	> 1 d	0.1271570	0.1261973	0.0049533
EARTH	1983-09-22 18:54	> 1 w	0.1450336	0.1319015	0.0107914
EARTH	1990-10-09 16:57	> 1 w	0.1611765	0.1569866	0.0029185
EARTH	1997-10-25 14:37	> 1 w	0.1598171	0.1488304	0.0042493
EARTH	2004-11-09 16:14	> 1 d	0.1385523	0.1127901	0.0088585
EARTH	2011-11-23 13:04	> 1 d	0.1005087	0.0768654	0.0079395
EARTH	2018-12-01 13:30	< 1 min	0.0534509	0.0531253	0.0001085
EARTH	2025-12-03 07:33	993.2	0.0306585	0.0059489	0.0105531
EARTH	2032-12-01 07:28	600.9	0.0514676	0.0400660	0.0038139
EARTH	2039-11-24 16:09	1432.0	0.0967832	0.0840608	0.0042527
EARTH	2046-11-11 01:57	> 1 d	0.1377688	0.1179235	0.0067407
EARTH	2053-10-25 15:05	> 1 d	0.1613623	0.1514386	0.0036838
EARTH	2060-10-07 16:11	> 1 d	0.1620477	0.1569960	0.0027553
EARTH	2067-09-19 03:20	> 1 d	0.1413228	0.1298615	0.0081963
EARTH	2071-12-03 08:40	1082.5	0.1711440	0.0817209	0.0298519
EARTH	2074-09-09 19:10	1173.4	0.1262711	0.1259848	0.0016032
EARTH	2078-12-05 03:01	551.1	0.0873301	0.0087347	0.0274508
EARTH	2081-09-09 07:27	370.1	0.1500991	0.1265940	0.0118258
EARTH	2085-12-05 03:34	382.6	0.0175791	0.0065102	0.0145132
EARTH	2088-09-10 05:29	97.2	0.1690371	0.1345683	0.0140097
EARTH	2092-12-05 02:37	35.0	0.0402508	0.0072853	0.0667516
EARTH	2095-09-10 14:44	1130.7	0.1460171	0.1252468	0.0381121
EARTH	2099-12-05 08:15	> 1 d	0.1000379	0.0087731	0.0792902
EARTH	2102-09-11 20:33	> 1 d	0.1258660	0.1251230	0.0077106
EARTH	2106-12-04 08:47	> 1 d	0.1715204	0.0101704	0.0722241
EARTH	2109-09-17 22:35	> 1 w	0.1345459	0.1263131	0.0194677
EARTH	2116-10-04 03:29	> 1 w	0.1552479	0.1428169	0.0122021
EARTH	2123-10-22 15:47	> 1 w	0.1610402	0.1588931	0.0027981

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
239.95474853	330.61104267	0.00529247	MINIMUM
124.37941560	246.07287969	0.12595522	MINIMUM
172.70462546	281.83022983	0.16346755	SADDLE
1.67559177	106.92694098	0.44789031	SADDLE
3.58211255	289.66966463	1.55457673	SADDLE
182.79523248	108.91891020	2.13276168	MAXIMUM

Download:

MOID Plots

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