Asteroids

2018SB2 help

Last update: 2026-01-17 13:01 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.367

Aphelion (Q)

2.276

Eccentricity (e)

0.722

Inclination (i)

2.2

deg

Orbit period (P)

555.0

Earth MOID

0.00077

U parameter

0.0

Next Earth close approach

Date

2056-09-19

Nominal distance (from Earth center)

0.02425

3627417

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.1

mag

Diameter

40 - 90*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-09-21

Observatory

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.321733

1-sigma variation

4.574E-9

Unit

Eccentricity (e)

Value

0.722327

1-sigma variation

2.753E-8

Unit

Inclination (i)

Value

2.1704

1-sigma variation

3.230E-6

Unit

Long. of Ascending Node (Ω)

Value

354.8941

1-sigma variation

4.723E-5

Unit

Arg. of Perihelion (ω)

Value

240.2334

1-sigma variation

4.682E-5

Unit

Mean Anomaly (M)

Value

292.12412

1-sigma variation

3.582E-6

Unit

Perihelion distance

Value

0.367009

1-sigma variation

Unit

Aphelion distance

Value

2.276457

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.020012

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.530406

1-sigma variation

Unit

MOID

Value

0.000767

1-sigma variation

Unit

Orbit Period

Value

555.0271

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.09172E-17	-1.17748E-16	3.31590E-15	-2.03843E-14	1.15111E-14	-8.43261E-15
e	-1.17748E-16	7.57744E-16	-1.67793E-14	1.09839E-13	-6.72635E-14	5.42150E-14
i	3.31590E-15	-1.67793E-14	1.04355E-11	-1.91780E-11	2.13158E-11	-5.92345E-12
Ω	-2.03843E-14	1.09839E-13	-1.91780E-11	2.23101E-9	-2.20482E-9	-1.17566E-11
ω	1.15111E-14	-6.72635E-14	2.13158E-11	-2.20482E-9	2.19196E-9	6.97287E-12
M	-8.43261E-15	5.42150E-14	-5.92345E-12	-1.17566E-11	6.97287E-12	1.28330E-11

Date of computation: 2026-01-17 13:01 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

24.114

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

40 - 90*

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

2677

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.630044

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-09-18.3918

Unit

Source

[2]

Last Observation

Value

2026-01-16.7077

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

72 (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 2018SB2 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	1950-01-13 08:49	< 1 min	0.0642450	0.0642359	0.0000031
MERCURY	1954-10-01 23:00	< 1 min	0.0403377	0.0403316	0.0000020
VENUS	1960-11-20 18:05	< 1 min	0.0366087	0.0366060	0.0000009
EARTH	1980-09-17 18:50	< 1 s	0.0167315	0.0167310	0.0000002
VENUS	1986-09-25 11:54	< 1 s	0.0469979	0.0469976	0.0000001
EARTH	1988-01-16 21:24	< 1 s	0.0363840	0.0363837	0.0000001
VENUS	2001-10-09 00:28	< 1 min	0.0383908	0.0383893	0.0000005
MERCURY	2012-06-22 22:51	< 1 min	0.0382284	0.0382277	0.0000002
EARTH	2018-09-17 23:56	< 1 s	0.0306062	0.0306059	0.0000001
EARTH	2026-01-17 02:49	< 1 s	0.0414921	0.0414919	0.0000001
MARS	2026-05-27 06:21	< 1 s	0.0451940	0.0451938	0.0000001
MERCURY	2036-10-18 21:33	< 1 min	0.0333898	0.0333895	0.0000001
MARS	2038-01-22 09:16	< 1 s	0.0440727	0.0440720	0.0000002
MERCURY	2052-01-20 09:34	< 1 min	0.0420062	0.0420045	0.0000006
EARTH	2056-09-19 23:58	< 1 min	0.0242476	0.0242451	0.0000008
EARTH	2061-01-11 13:36	< 1 min	0.1150583	0.1150570	0.0000004
EARTH	2064-01-22 20:47	< 1 min	0.1586946	0.1586909	0.0000012
MERCURY	2065-09-12 17:25	< 1 min	0.0329538	0.0329532	0.0000002
VENUS	2067-04-28 06:08	< 1 min	0.0350497	0.0350478	0.0000006
VENUS	2085-06-07 01:10	< 1 min	0.0292983	0.0292717	0.0000089
MERCURY	2085-07-16 21:26	1.0	0.0453427	0.0453141	0.0000095
EARTH	2088-09-12 00:32	< 1 min	0.1911203	0.1910897	0.0000102
EARTH	2091-09-22 19:17	< 1 min	0.0648453	0.0648156	0.0000099
EARTH	2096-01-14 05:20	< 1 min	0.0788402	0.0788179	0.0000074
EARTH	2099-01-24 07:19	< 1 min	0.1985406	0.1985246	0.0000053
MERCURY	2103-10-02 17:07	< 1 min	0.0415076	0.0415055	0.0000007
VENUS	2114-05-08 00:08	< 1 min	0.0297218	0.0296971	0.0000082
MERCURY	2119-01-08 12:01	1.3	0.0432120	0.0431788	0.0000111
VENUS	2125-02-25 20:52	1.2	0.0417478	0.0417152	0.0000109
EARTH	2126-09-23 04:08	1.0	0.0480782	0.0480261	0.0000174

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
70.63139178	255.69398679	0.00076723	MINIMUM
290.78710834	13.98831961	0.03212178	MINIMUM
1.85194658	136.53938572	0.64637978	SADDLE
180.32099229	314.24612381	1.28865794	SADDLE
1.78423451	316.41307336	1.35537206	SADDLE
180.29207797	134.24206953	3.28888593	MAXIMUM

Download:

MOID Plots

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