Asteroids

2018CW2 help

Last update: 2024-04-25 01:36 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.439

Aphelion (Q)

1.081

Eccentricity (e)

0.422

Inclination (i)

5.1

deg

Orbit period (P)

242.0

Earth MOID

0.00433

U parameter

1.1

A₂

-492.2

10^-15au/days²

Next Earth close approach

Date

2026-02-18

Nominal distance (from Earth center)

0.13597

20340670

Maximum Brightness

25.2

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

20 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-02-09

Observatory

Mt. Lemmon Survey

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.759949

1-sigma variation

8.247E-9

Unit

Eccentricity (e)

Value

0.422417

1-sigma variation

2.542E-7

Unit

Inclination (i)

Value

5.0966

1-sigma variation

7.302E-6

Unit

Long. of Ascending Node (Ω)

Value

331.9113

1-sigma variation

1.098E-5

Unit

Arg. of Perihelion (ω)

Value

327.7018

1-sigma variation

2.237E-5

Unit

Mean Anomaly (M)

Value

310.20896

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.438934

1-sigma variation

Unit

Aphelion distance

Value

1.080964

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.550309

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.017613

1-sigma variation

Unit

MOID

Value

0.004332

1-sigma variation

Unit

Orbit Period

Value

241.9774

1-sigma variation

Unit

U parameter

Value

1.1

1-sigma variation

Unit

A₂

Value

-492.21470

1-sigma variation

23.99670

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	6.80083E-17	1.74600E-15	1.02642E-14	7.90841E-14	-1.73518E-13	2.39421E-13	1.76335E-7
e	1.74600E-15	6.46021E-14	9.87795E-13	1.84577E-12	-5.23372E-12	1.04545E-11	4.98572E-6
i	1.02642E-14	9.87795E-13	5.33139E-11	-1.63876E-11	-3.32661E-11	1.96598E-10	6.59795E-5
Ω	7.90841E-14	1.84577E-12	-1.63876E-11	1.20480E-10	-2.21338E-10	2.34098E-10	1.58300E-4
ω	-1.73518E-13	-5.23372E-12	-3.32661E-11	-2.21338E-10	5.00341E-10	-7.76149E-10	-4.23982E-4
M	2.39421E-13	1.04545E-11	1.96598E-10	2.34098E-10	-7.76149E-10	1.78294E-9	7.32847E-4
A₂	1.76335E-7	4.98572E-6	6.59795E-5	1.58300E-4	-4.23982E-4	7.32847E-4	5.75842E2

Date of computation: 2024-04-23 10:08 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

25.595

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

20 - 50*

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 ODIM	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

1472

Unit

Source

[1]

Unobserved

Value

795

Unit

Source

[1]

Normalized RMS of residuals

Value

0.807557

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-02-09.26928

Unit

Source

[2]

Last Observation

Value

2022-02-17.41532

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

159 (2)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2022-02-19

Unit

Source

[3]

Last Observation

Value

2022-02-19

Unit

Source

[3]

Delay (Discarded)

Value

2 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

3 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	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 2018CW2 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1951-01-12 18:37	1301.5	0.1075327	0.1062788	0.0004425
MERCURY	1951-05-21 10:01	1407.0	0.0239478	0.0204248	0.0018102
EARTH	1953-01-27 14:25	989.6	0.1014485	0.0989193	0.0008471
MERCURY	1954-01-10 12:46	1015.9	0.0192345	0.0158699	0.0013037
EARTH	1955-02-10 12:53	465.2	0.0653910	0.0612078	0.0013945
MERCURY	1956-09-02 15:03	511.8	0.0158828	0.0137214	0.0007501
EARTH	1957-02-17 11:02	80.8	0.0079259	0.0065734	0.0005741
EARTH	1959-02-19 12:35	22.4	0.0457186	0.0422253	0.0011652
MERCURY	1959-05-02 16:13	391.3	0.0237096	0.0220762	0.0005932
EARTH	1961-02-18 21:39	19.0	0.1065369	0.1029810	0.0011853
MERCURY	1961-12-28 06:52	300.8	0.0318766	0.0295548	0.0008264
EARTH	1963-02-18 02:44	35.7	0.1718107	0.1684287	0.0011273
MERCURY	1964-08-23 19:31	216.7	0.0411799	0.0381827	0.0010348
EARTH	1997-12-21 00:14	7.3	0.1725935	0.1719174	0.0002255
EARTH	1999-12-20 15:27	2.4	0.1244847	0.1239904	0.0001650
EARTH	2001-12-20 07:37	3.8	0.0887263	0.0884716	0.0000852
EARTH	2003-12-22 17:01	10.9	0.0749300	0.0749198	0.0000037
EARTH	2005-12-26 17:25	17.3	0.0828797	0.0827887	0.0000304
MERCURY	2007-09-16 13:27	13.9	0.0288644	0.0285851	0.0000931
EARTH	2008-01-03 18:27	19.2	0.0984059	0.0983388	0.0000224
EARTH	2010-01-12 14:16	15.0	0.1086224	0.1086025	0.0000067
MERCURY	2010-05-16 00:12	12.5	0.0037365	0.0036678	0.0000233
EARTH	2012-01-22 07:11	9.7	0.1086655	0.1086575	0.0000027
MERCURY	2013-01-15 01:42	7.8	0.0226388	0.0226037	0.0000117
EARTH	2014-01-30 14:48	5.4	0.0980724	0.0980556	0.0000056
EARTH	2016-02-08 02:29	2.3	0.0771286	0.0771140	0.0000049
EARTH	2018-02-13 17:41	< 1 min	0.0477291	0.0477218	0.0000024
EARTH	2020-02-17 17:37	< 1 min	0.0161510	0.0161498	0.0000004
EARTH	2022-02-18 09:19	< 1 s	0.0057353	0.0057348	0.0000002
EARTH	2024-02-20 03:24	< 1 min	0.0653330	0.0653226	0.0000035
EARTH	2026-02-18 22:09	< 1 min	0.1359690	0.1359401	0.0000096
EARTH	2056-12-21 08:24	11.8	0.1773121	0.1761949	0.0003727
EARTH	2058-12-20 20:21	2.5	0.1198597	0.1188536	0.0003364
EARTH	2060-12-21 02:26	22.4	0.0826110	0.0821345	0.0001621
EARTH	2062-12-25 16:12	77.4	0.0801567	0.0798315	0.0001115
EARTH	2065-01-02 16:09	155.3	0.0974665	0.0969621	0.0001693
EARTH	2067-01-14 02:46	210.6	0.1090711	0.1089267	0.0000486
EARTH	2069-01-24 19:40	231.3	0.1058317	0.1054016	0.0001436
EARTH	2071-02-05 01:55	212.2	0.0860119	0.0848727	0.0003798
EARTH	2073-02-13 03:13	142.0	0.0509672	0.0491611	0.0006020
EARTH	2075-02-18 05:13	59.8	0.0079723	0.0061358	0.0006279
EARTH	2077-02-18 11:52	110.2	0.0083734	0.0039369	0.0016313
MERCURY	2077-04-29 21:59	599.4	0.0052156	0.0041451	0.0010180
EARTH	2079-02-20 02:19	15.4	0.0634179	0.0576573	0.0019204
MERCURY	2079-12-27 10:09	1054.9	0.0153916	0.0114893	0.0016925
EARTH	2081-02-19 01:22	126.6	0.1274193	0.1105299	0.0056299
MERCURY	2082-08-23 08:11	> 1 d	0.0202593	0.0158908	0.0039213
EARTH	2083-02-17 22:42	331.2	0.1963172	0.1682490	0.0093561
MERCURY	2085-04-18 03:43	> 1 d	0.0227632	0.0185253	0.0062614
MERCURY	2087-12-12 10:04	> 1 d	0.0240882	0.0196850	0.0088480
MERCURY	2090-08-06 13:21	> 1 d	0.0252561	0.0206720	0.0117286
MERCURY	2093-03-31 09:48	> 1 d	0.0257470	0.0210682	0.0147231
MERCURY	2095-11-24 01:13	> 1 d	0.0257067	0.0210548	0.0173764
MERCURY	2098-07-18 21:48	> 1 w	0.0262343	0.0214602	0.0206292
MERCURY	2101-03-13 10:58	> 1 w	0.0259691	0.0212589	0.0235584
MERCURY	2103-11-06 02:34	> 1 w	0.0259501	0.0212767	0.0263389
MERCURY	2106-06-30 22:50	> 1 w	0.0264156	0.0215361	0.0302952
MERCURY	2109-02-22 22:35	> 1 w	0.0273210	0.0221933	0.0346873
MERCURY	2111-10-19 02:57	> 1 w	0.0288566	0.0230702	0.0403853
EARTH	2113-12-22 15:19	> 1 d	0.1688848	0.0808978	0.0596508
MERCURY	2114-06-13 18:36	> 1 w	0.0323361	0.0247277	0.0503565
EARTH	2115-12-22 08:54	12.3	0.1136380	0.0796776	0.0486242
MERCURY	2117-02-07 02:49	> 1 w	0.0408657	0.0276732	0.0684879
EARTH	2117-12-23 00:50	> 1 d	0.0810433	0.0784291	0.0161435
EARTH	2119-12-28 09:34	> 1 w	0.0834777	0.0785097	0.0184164
EARTH	2122-01-06 08:18	> 1 w	0.1009770	0.0864795	0.0187034
EARTH	2124-01-18 04:10	> 1 w	0.1095327	0.1092303	0.0014076

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