Asteroids

2018KC help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.745

Aphelion (Q)

1.416

Eccentricity (e)

0.311

Inclination (i)

9.2

deg

Orbit period (P)

410.3

Earth MOID

0.00395

U parameter

7.1

Next Earth close approach

Date

2025-11-09

Nominal distance (from Earth center)

0.04421

6613401

Maximum Brightness

24.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.5

mag

Diameter

8 - 19*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-05-16

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

1.080586

1-sigma variation

0.000134

Unit

Eccentricity (e)

Value

0.310694

1-sigma variation

0.000369

Unit

Inclination (i)

Value

9.2068

1-sigma variation

0.0032

Unit

Long. of Ascending Node (Ω)

Value

233.4768

1-sigma variation

0.0069

Unit

Arg. of Perihelion (ω)

Value

261.9246

1-sigma variation

0.0271

Unit

Mean Anomaly (M)

Value

314.59058

1-sigma variation

0.86026

Unit

Perihelion distance

Value

0.744855

1-sigma variation

Unit

Aphelion distance

Value

1.416317

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.008620

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.053703

1-sigma variation

Unit

MOID

Value

0.003955

1-sigma variation

Unit

Orbit Period

Value

410.2867

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.80676E-8	4.93897E-8	4.28732E-7	9.24238E-7	3.63464E-6	-1.15628E-4
e	4.93897E-8	1.35798E-7	1.18757E-6	2.53079E-6	9.87949E-6	-3.16290E-4
i	4.28732E-7	1.18757E-6	1.04895E-5	2.20169E-5	8.51318E-5	-2.74789E-3
Ω	9.24238E-7	2.53079E-6	2.20169E-5	4.73025E-5	1.85622E-4	-5.91603E-3
ω	3.63464E-6	9.87949E-6	8.51318E-5	1.85622E-4	7.35197E-4	-2.32461E-2
M	-1.15628E-4	-3.16290E-4	-2.74789E-3	-5.91603E-3	-2.32461E-2	7.40048E-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

27.501

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

8 - 19*

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

2710

Unit

Source

[1]

Normalized RMS of residuals

Value

0.432338

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-05-16.25711

Unit

Source

[2]

Last Observation

Value

2018-05-18.25256

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

36 (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

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 2018KC 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	1957-11-02 19:26	> 1 mo	0.0630508	0.0325891	5.0588013
EARTH	1967-11-12 00:10	> 1 mo	0.0812897	0.0331297	2.9329387
EARTH	1969-05-06 00:23	> 1 mo	0.1589792	0.0001562	2.6407173
EARTH	1977-12-10 13:39	> 1 mo	0.1973356	0.1072207	0.7041636
EARTH	1979-05-12 04:07	> 1 mo	0.0291972	0.0047623	1.5449466
EARTH	1989-05-13 17:35	> 1 w	0.0178704	0.0048713	0.1764631
EARTH	2006-11-06 21:36	> 1 d	0.0307365	0.0304090	0.0032590
EARTH	2018-05-13 13:44	< 1 min	0.0078692	0.0078436	0.0000085
EARTH	2025-11-09 23:09	> 1 d	0.0442079	0.0267570	0.0136848
EARTH	2027-05-07 17:20	993.3	0.1199271	0.0677272	0.0174003
EARTH	2034-11-03 13:13	> 1 d	0.0817053	0.0276155	0.0248794
EARTH	2055-05-22 11:50	590.3	0.1928302	0.1674038	0.0084758
EARTH	2062-12-12 15:48	766.4	0.1973503	0.1934354	0.0013068
EARTH	2064-05-14 18:24	33.6	0.0403993	0.0364646	0.0013120
EARTH	2071-11-18 07:47	970.7	0.1193392	0.1026190	0.0056147
EARTH	2073-05-11 12:45	447.2	0.0330708	0.0094765	0.0080857
EARTH	2080-11-07 01:46	706.1	0.0269412	0.0255350	0.0022889
EARTH	2082-05-03 07:01	823.1	0.1746313	0.1375372	0.0123678
EARTH	2101-05-22 12:26	> 1 d	0.1772200	0.0000523	0.0839622
EARTH	2108-11-25 12:47	> 1 w	0.1533192	0.0484907	0.1030373
EARTH	2110-05-13 18:25	> 1 d	0.0166525	0.0027367	0.1096278
EARTH	2117-10-30 06:17	> 1 mo	0.1728100	0.0291668	0.8481336

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
78.35973089	129.24951956	0.00423546	MINIMUM
287.64919439	303.72033660	0.02639565	MINIMUM
3.59894311	37.44097869	0.27805430	SADDLE
182.32255669	215.27868518	0.44470571	SADDLE
2.52921830	215.95438143	1.75246984	SADDLE
180.89685493	34.21091190	2.39430342	MAXIMUM

Download:

MOID Plots

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