Asteroids

2018SP1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.710

Aphelion (Q)

2.810

Eccentricity (e)

0.597

Inclination (i)

3.7

deg

Orbit period (P)

852.5

Earth MOID

0.00288

U parameter

8.6

Next Earth close approach

Date

2025-10-06

Nominal distance (from Earth center)

0.03135

4689510

Maximum Brightness

18.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.1

mag

Diameter

60 - 140*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-09-19

Observatory

Pan-STARRS 2, Haleakala

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

1.759529

1-sigma variation

0.005909

Unit

Eccentricity (e)

Value

0.596756

1-sigma variation

0.001044

Unit

Inclination (i)

Value

3.6961

1-sigma variation

0.0061

Unit

Long. of Ascending Node (Ω)

Value

164.5357

1-sigma variation

0.0229

Unit

Arg. of Perihelion (ω)

Value

286.1955

1-sigma variation

0.1559

Unit

Mean Anomaly (M)

Value

358.90622

1-sigma variation

1.48764

Unit

Perihelion distance

Value

0.709519

1-sigma variation

Unit

Aphelion distance

Value

2.809539

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.021601

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.350840

1-sigma variation

Unit

MOID

Value

0.002880

1-sigma variation

Unit

Orbit Period

Value

852.4974

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.49164E-5	6.17178E-6	3.59317E-5	1.35560E-4	-9.21200E-4	-8.79050E-3
e	6.17178E-6	1.09091E-6	6.35123E-6	2.39614E-5	-1.62830E-4	-1.55380E-3
i	3.59317E-5	6.35123E-6	3.69775E-5	1.39506E-4	-9.47993E-4	-9.04612E-3
Ω	1.35560E-4	2.39614E-5	1.39506E-4	5.26325E-4	-3.57652E-3	-3.41284E-2
ω	-9.21200E-4	-1.62830E-4	-9.47993E-4	-3.57652E-3	2.43041E-2	2.31920E-1
M	-8.79050E-3	-1.55380E-3	-9.04612E-3	-3.41284E-2	2.31920E-1	2.21308E0

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

23.124

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

60 - 140*

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

2538

Unit

Source

[1]

Normalized RMS of residuals

Value

0.575128

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-09-12.30745

Unit

Source

[2]

Last Observation

Value

2018-10-04.1459

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

60 (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 2018SP1 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	1951-03-09 21:10	> 1 d	0.0327757	0.0007315	0.0204593
EARTH	1958-03-11 18:42	> 1 d	0.0651725	0.0011912	0.0870796
EARTH	1965-03-16 12:06	> 1 d	0.1490105	0.0023889	0.1297118
EARTH	2011-09-29 16:40	> 1 d	0.1179223	0.0301628	0.0597449
EARTH	2018-10-04 23:56	< 1 s	0.0390692	0.0389859	0.0000278
EARTH	2025-10-06 20:30	> 1 d	0.0313474	0.0311816	0.0063097
EARTH	2032-10-08 06:44	> 1 w	0.0392721	0.0315406	0.1628550
EARTH	2039-10-11 12:13	> 1 mo	0.0612559	0.0314489	0.5423356
EARTH	2046-10-17 13:42	> 1 mo	0.1164385	0.0304912	0.7558099
EARTH	2053-10-28 00:24	> 1 mo	0.1741472	0.0271203	0.7176473
EARTH	2124-02-21 04:47	> 1 mo	0.1530797	0.0131303	0.5927466

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
43.05763267	63.90106793	0.00263739	MINIMUM
316.15039400	271.99011836	0.03122987	MINIMUM
359.32893165	347.46729873	0.27925953	SADDLE
359.57494545	167.95559745	1.72479211	SADDLE
179.86015095	168.38398969	1.79675503	SADDLE
179.93372150	348.42339657	3.79221003	MAXIMUM

Download:

MOID Plots

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