Asteroids

2018WG2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.844

Aphelion (Q)

1.371

Eccentricity (e)

0.238

Inclination (i)

0.8

deg

Orbit period (P)

425.7

Earth MOID

0.00116

U parameter

6.1

Next Earth close approach

Date

2025-11-27

Nominal distance (from Earth center)

0.03483

5209833

Maximum Brightness

25.7

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

2.6 - 6*

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

1.107446

1-sigma variation

0.000040

Unit

Eccentricity (e)

Value

0.237733

1-sigma variation

0.000078

Unit

Inclination (i)

Value

0.8171

1-sigma variation

0.0011

Unit

Long. of Ascending Node (Ω)

Value

63.6314

1-sigma variation

0.0032

Unit

Arg. of Perihelion (ω)

Value

80.0637

1-sigma variation

0.0016

Unit

Mean Anomaly (M)

Value

303.16649

1-sigma variation

0.10138

Unit

Perihelion distance

Value

0.844169

1-sigma variation

Unit

Aphelion distance

Value

1.370723

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.017434

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.074175

1-sigma variation

Unit

MOID

Value

0.001162

1-sigma variation

Unit

Orbit Period

Value

425.6792

1-sigma variation

Unit

U parameter

Value

6.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.60513E-9	3.13148E-9	4.23332E-8	1.25238E-7	6.45307E-8	-4.06161E-6
e	3.13148E-9	6.11507E-9	8.28062E-8	2.45292E-7	1.26093E-7	-7.92415E-6
i	4.23332E-8	8.28062E-8	1.12511E-6	3.34124E-6	1.70722E-6	-1.07130E-4
Ω	1.25238E-7	2.45292E-7	3.34124E-6	9.94117E-6	5.05810E-6	-3.16945E-4
ω	6.45307E-8	1.26093E-7	1.70722E-6	5.05810E-6	2.61097E-6	-1.63297E-4
M	-4.06161E-6	-7.92415E-6	-1.07130E-4	-3.16945E-4	-1.63297E-4	1.02775E-2

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

30.046

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

2.6 - 6*

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

[-]

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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

2533

Unit

Source

[1]

Normalized RMS of residuals

Value

0.645836

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-11-29.23915

Unit

Source

[2]

Last Observation

Value

2018-11-30.732895

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

18 (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 2018WG2 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	1957-11-20 04:40	> 1 w	0.1497022	0.0002159	0.1871296
EARTH	1959-05-20 10:42	> 1 w	0.1449245	0.0079378	0.2886626
EARTH	1967-05-05 06:21	> 1 mo	0.0580862	0.0074261	0.8067378
EARTH	1975-02-10 00:05	> 1 mo	0.1522837	0.0502048	0.0450884
EARTH	1982-11-28 08:51	615.7	0.0080711	0.0000432	0.0063295
EARTH	1984-05-24 11:32	375.6	0.1719417	0.1470064	0.0083123
EARTH	1991-11-24 18:35	> 1 d	0.0721075	0.0096954	0.0208051
EARTH	1993-05-21 11:39	1303.4	0.1016648	0.0463730	0.0184671
EARTH	2000-11-19 21:33	12.4	0.1583013	0.1530280	0.0017578
EARTH	2002-05-17 05:25	126.1	0.0215740	0.0165507	0.0016964
EARTH	2009-11-26 06:17	287.3	0.0647341	0.0537687	0.0036552
EARTH	2011-05-24 12:40	216.9	0.1365509	0.1263457	0.0034019
EARTH	2018-11-30 19:08	< 1 s	0.0013359	0.0013347	0.0000004
EARTH	2025-11-27 19:06	211.7	0.0348256	0.0283059	0.0021735
EARTH	2032-11-18 23:44	218.1	0.1874821	0.1757432	0.0039130
EARTH	2041-05-15 03:21	628.9	0.1325694	0.1017951	0.0102595
EARTH	2048-05-05 20:58	> 1 d	0.0057463	0.0042760	0.0079420
MARS	2048-10-09 22:38	> 1 d	0.0334531	0.0133786	0.0131912
EARTH	2054-11-29 00:57	> 1 w	0.0101966	0.0015005	0.2316858
EARTH	2061-11-17 06:57	> 1 mo	0.1752965	0.0008833	7.8841687
MARS	2063-10-14 13:39	> 1 mo	0.0278625	0.0167928	0.8885251
EARTH	2070-05-11 06:07	> 1 mo	0.1020226	0.0047424	16.3789874
EARTH	2077-04-25 09:40	> 1 mo	0.0617878	0.0043143	14.9139775
EARTH	2084-02-13 16:41	> 1 mo	0.1450396	0.0125229	0.1168941
EARTH	2090-12-04 09:13	> 1 mo	0.0501680	0.0009621	13.4217660
EARTH	2097-11-20 22:46	> 1 mo	0.1035529	0.0013662	8.7026054
MARS	2103-04-13 07:29	> 1 mo	0.0283287	0.0263357	0.0441697
EARTH	2106-05-16 19:00	> 1 mo	0.1891993	0.0036193	2.6228820
EARTH	2113-05-06 09:35	> 1 mo	0.0187537	0.0051018	11.1315556
EARTH	2120-05-09 10:23	> 1 mo	0.0648625	0.0050297	102.3339570

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
297.45822768	326.45393862	0.00117795	MINIMUM
67.92473596	121.86520332	0.00458557	MINIMUM
3.18679638	44.67590912	0.14388831	SADDLE
181.96003359	223.39956926	0.35924544	SADDLE
3.22856303	224.71054023	1.85647301	SADDLE
181.89137820	43.33395924	2.35862630	MAXIMUM

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MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2018WG2

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2077-05-12.976	79800.976	-1.098	0.23 ± 0.018	8.00E6	1.08E-7	8.26E-4	-9.63
2078-05-22.188	80175.188	1.560	0.84 ± 0.009	3.87E6	1.11E-7	8.23E-4	-9.63
2092-05-12.275	85279.275	-1.098	0.87 ± 0.018	3.64E7	2.15E-8	8.23E-4	-10.44
2097-05-17.091	87110.091	0.174	1.97 ± 0.081	2.84E7	2.13E-8	8.26E-4	-10.47
2102-05-21.142	88939.142	1.758	0.71 ± 0.018	5.00E6	6.70E-8	8.25E-4	-10.00
2103-05-21.546	89304.546	0.485	1.64 ± 0.005	5.24E5	1.54E-6	8.25E-4	-8.65
2107-05-05.550	90749.550	-0.068	1.00 ± 0.000	2.02E8	7.33E-9	8.25E-4	-10.99
2109-05-21.353	91496.353	1.097	0.86 ± 0.007	6.40E6	1.23E-7	8.29E-4	-9.77
2118-05-02.452	94764.452	-0.986	0.57 ± 0.023	1.09E7	8.61E-8	8.25E-4	-9.97


Based on 18 optical observations (of which 1 are rejected as outliers) from 2018/11/29.239 to 2018/11/30.733.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.99 and 1.99 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: