Asteroids

2018SP2 help

Last update: 2026-07-30 14:25 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.735

Aphelion (Q)

1.115

Eccentricity (e)

0.206

Inclination (i)

26.8

deg

Orbit period (P)

324.7

Earth MOID

0.00331

U parameter

6.5

Next Earth close approach

Date

2026-09-30

Nominal distance (from Earth center)

0.01189

1778019

Maximum Brightness

18.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.8

mag

Diameter

29 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-09-29

Observatory

Palomar Mountain--ZTF

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

0.924575

1-sigma variation

0.000043

Unit

Eccentricity (e)

Value

0.205528

1-sigma variation

0.000033

Unit

Inclination (i)

Value

26.8221

1-sigma variation

0.0099

Unit

Long. of Ascending Node (Ω)

Value

187.1986

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

303.3893

1-sigma variation

0.0163

Unit

Mean Anomaly (M)

Value

131.07538

1-sigma variation

0.19675

Unit

Perihelion distance

Value

0.734548

1-sigma variation

Unit

Aphelion distance

Value

1.114601

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.202263

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.003557

1-sigma variation

Unit

MOID

Value

0.003311

1-sigma variation

Unit

Orbit Period

Value

324.7218

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.84056E-9	1.43191E-9	4.23568E-7	-3.70796E-9	-6.99555E-7	-8.44106E-6
e	1.43191E-9	1.11826E-9	3.30141E-7	-2.89350E-9	-5.44492E-7	-6.56611E-6
i	4.23568E-7	3.30141E-7	9.75707E-5	-8.54655E-7	-1.61026E-4	-1.94242E-3
Ω	-3.70796E-9	-2.89350E-9	-8.54655E-7	7.49016E-9	1.40984E-6	1.70036E-5
ω	-6.99555E-7	-5.44492E-7	-1.61026E-4	1.40984E-6	2.65900E-4	3.20820E-3
M	-8.44106E-6	-6.56611E-6	-1.94242E-3	1.70036E-5	3.20820E-3	3.87120E-2

Date of computation: 2026-07-30 14:25 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

24.832

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

29 - 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

2882

Unit

Source

[1]

Normalized RMS of residuals

Value

0.578853

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-09-29.112581

Unit

Source

[2]

Last Observation

Value

2018-10-01.380224

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

59 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

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 2018SP2 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
EARTH	1957-10-01 11:52	1111.8	0.0753923	0.0015419	0.0587376
EARTH	1980-09-28 09:26	1155.3	0.0680829	0.0024376	0.0312134
EARTH	1995-10-01 05:59	245.2	0.0235869	0.0029878	0.0089695
EARTH	2018-09-30 16:39	< 1 s	0.0054773	0.0054714	0.0000020
EARTH	2026-09-30 20:23	99.2	0.0118853	0.0031002	0.0032672
EARTH	2034-10-02 17:00	200.0	0.1450825	0.0672148	0.0259653
EARTH	2059-09-29 05:51	> 1 d	0.0706193	0.0022023	0.0982603
EARTH	2067-10-01 21:55	> 1 d	0.0490829	0.0022240	0.0877247
EARTH	2075-04-02 20:58	> 1 d	0.1918703	0.1918493	0.0004170
EARTH	2075-10-03 02:42	143.6	0.1978404	0.1236953	0.0247374
EARTH	2092-09-26 18:05	> 1 d	0.1352710	0.0012400	0.1085473
EARTH	2100-10-01 12:19	> 1 d	0.0104799	0.0024583	0.1483656
EARTH	2108-04-11 09:22	> 1 mo	0.1984866	0.1923598	0.4253413
EARTH	2117-09-30 12:56	> 1 mo	0.0452766	0.0020671	3.6848884
EARTH	2125-04-03 16:16	> 1 mo	0.1891326	0.1889489	0.1089506

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
246.95803177	263.61228502	0.00331137	MINIMUM
54.31180388	88.73556724	0.19447449	MINIMUM
334.90681511	355.94853638	0.46068730	SADDLE
145.53046359	178.49852666	0.48855407	SADDLE
349.46084630	195.06395895	1.71344504	SADDLE
197.05289020	43.90709359	2.06906676	MAXIMUM

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MOID Plots

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