Asteroids

2018CA1 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.978

Aphelion (Q)

1.448

Eccentricity (e)

0.194

Inclination (i)

27.3

deg

Orbit period (P)

487.9

Earth MOID

0.01954

U parameter

8.6

Next Earth close approach

Date

2030-02-07

Nominal distance (from Earth center)

0.06523

9758923

Maximum Brightness

21.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.2

mag

Diameter

24 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-02-05

Observatory

University of Arizona Catalina Sky 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

1.212832

1-sigma variation

0.002212

Unit

Eccentricity (e)

Value

0.193745

1-sigma variation

0.001931

Unit

Inclination (i)

Value

27.2744

1-sigma variation

0.0019

Unit

Long. of Ascending Node (Ω)

Value

135.7839

1-sigma variation

0.0071

Unit

Arg. of Perihelion (ω)

Value

326.0036

1-sigma variation

0.2253

Unit

Mean Anomaly (M)

Value

113.70667

1-sigma variation

3.37389

Unit

Perihelion distance

Value

0.977852

1-sigma variation

Unit

Aphelion distance

Value

1.447812

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.019885

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.376363

1-sigma variation

Unit

MOID

Value

0.019537

1-sigma variation

Unit

Orbit Period

Value

487.8647

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.89495E-6	4.27211E-6	-4.28805E-6	1.58049E-5	-4.98471E-4	-7.46458E-3
e	4.27211E-6	3.72852E-6	-3.74251E-6	1.37939E-5	-4.35046E-4	-6.51477E-3
i	-4.28805E-6	-3.74251E-6	3.78114E-6	-1.38454E-5	4.36702E-4	6.53907E-3
Ω	1.58049E-5	1.37939E-5	-1.38454E-5	5.10315E-5	-1.60948E-3	-2.41018E-2
ω	-4.98471E-4	-4.35046E-4	4.36702E-4	-1.60948E-3	5.07618E-2	7.60145E-1
M	-7.46458E-3	-6.51477E-3	6.53907E-3	-2.41018E-2	7.60145E-1	1.13832E1

Date of computation: 2026-03-17 23:26 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

25.192

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

24 - 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 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

3037

Unit

Source

[1]

Normalized RMS of residuals

Value

0.670913

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-02-05.3711

Unit

Source

[2]

Last Observation

Value

2018-02-09.32417

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

39 (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

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

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 2018CA1 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
MARS	1954-09-08 14:27	1006.3	0.0294626	0.0076612	0.0945042
EARTH	2002-01-27 22:00	> 1 d	0.1964910	0.0101325	0.0644665
EARTH	2006-01-30 14:53	> 1 d	0.1277121	0.0149583	0.0533568
EARTH	2010-02-01 23:22	> 1 d	0.0683241	0.0178244	0.0381628
EARTH	2014-02-03 17:15	1017.6	0.0288174	0.0187988	0.0133775
MARS	2014-11-15 18:15	44.1	0.0112923	0.0111997	0.0011899
EARTH	2018-02-04 09:44	< 1 s	0.0200951	0.0200471	0.0000160
EARTH	2022-02-04 16:20	901.9	0.0197880	0.0195924	0.0021965
EARTH	2026-02-05 06:51	> 1 d	0.0262920	0.0194039	0.0503778
EARTH	2030-02-07 01:42	> 1 d	0.0652344	0.0186220	0.1379436
EARTH	2034-02-09 14:56	> 1 w	0.1258313	0.0160553	0.1793570
EARTH	2038-02-12 12:49	> 1 w	0.1955395	0.0111678	0.2044219
MARS	2065-08-28 05:17	104.4	0.0468513	0.0045917	0.2307287
EARTH	2117-01-30 03:52	> 1 d	0.1661576	0.0122470	0.1164022
EARTH	2121-02-01 19:40	> 1 d	0.0976620	0.0163518	0.0878636
EARTH	2125-02-04 02:21	> 1 d	0.0428213	0.0183907	0.0470987

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
28.00616249	33.55769655	0.01888781	MINIMUM
237.83611801	228.14531686	0.35130467	MINIMUM
306.14767002	296.87588345	0.48905550	SADDLE
132.99007798	142.38623696	0.64082292	SADDLE
341.92127588	161.93588062	1.96837548	SADDLE
190.58390238	11.67449576	2.41459183	MAXIMUM

Download:

MOID Plots

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