Asteroids

2018RB1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.803

Aphelion (Q)

1.436

Eccentricity (e)

0.282

Inclination (i)

5.0

deg

Orbit period (P)

432.6

Earth MOID

0.00191

U parameter

6.5

Next Earth close approach

Date

2026-02-24

Nominal distance (from Earth center)

0.02163

3235480

Maximum Brightness

21.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.6

mag

Diameter

8 - 18*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-09-06

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

1.119432

1-sigma variation

0.000068

Unit

Eccentricity (e)

Value

0.282395

1-sigma variation

0.000091

Unit

Inclination (i)

Value

5.0435

1-sigma variation

0.0018

Unit

Long. of Ascending Node (Ω)

Value

166.8498

1-sigma variation

4.329E-5

Unit

Arg. of Perihelion (ω)

Value

266.7148

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

332.39510

1-sigma variation

0.19324

Unit

Perihelion distance

Value

0.803310

1-sigma variation

Unit

Aphelion distance

Value

1.435554

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.053652

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.005999

1-sigma variation

Unit

MOID

Value

0.001910

1-sigma variation

Unit

Orbit Period

Value

432.6087

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.60623E-9	6.17595E-9	1.21238E-7	-2.88606E-9	2.46349E-8	-1.31153E-5
e	6.17595E-9	8.28790E-9	1.62778E-7	-3.87545E-9	3.41184E-8	-1.75849E-5
i	1.21238E-7	1.62778E-7	3.19835E-6	-7.62625E-8	6.81944E-7	-3.45205E-4
Ω	-2.88606E-9	-3.87545E-9	-7.62625E-8	1.87428E-9	-1.63751E-8	8.21758E-6
ω	2.46349E-8	3.41184E-8	6.81944E-7	-1.63751E-8	2.94373E-7	-7.01658E-5
M	-1.31153E-5	-1.75849E-5	-3.45205E-4	8.21758E-6	-7.01658E-5	3.73429E-2

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

27.62

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 - 18*

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

2594

Unit

Source

[1]

Normalized RMS of residuals

Value

0.520827

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-09-06.35056

Unit

Source

[2]

Last Observation

Value

2018-09-10.12858

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

41 (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 2018RB1 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	1950-09-10 00:02	401.4	0.0116932	0.0007496	0.0046573
EARTH	1957-10-17 14:29	> 1 d	0.1550076	0.1470044	0.0026732
EARTH	1972-01-30 19:00	1367.9	0.1419344	0.1372884	0.0015490
EARTH	1979-03-01 19:59	99.9	0.0406452	0.0369812	0.0012290
EARTH	1984-09-05 08:14	122.2	0.0915315	0.0885258	0.0010019
EARTH	1991-10-05 06:07	> 1 d	0.1315977	0.1224313	0.0030601
EARTH	1998-12-14 03:09	> 1 d	0.1997585	0.1978183	0.0006468
EARTH	2006-02-23 18:13	850.3	0.0565518	0.0350963	0.0072726
EARTH	2013-03-07 22:48	229.3	0.1651832	0.1537054	0.0038266
EARTH	2018-09-11 14:18	< 1 min	0.0062973	0.0062909	0.0000022
EARTH	2026-02-24 12:21	370.2	0.0216278	0.0167049	0.0025499
EARTH	2031-09-29 21:27	> 1 d	0.1193667	0.0856592	0.0112797
EARTH	2039-02-27 22:45	> 1 d	0.0449069	0.0164532	0.0200360
EARTH	2044-11-07 23:34	> 1 d	0.1831615	0.1803577	0.0009348
EARTH	2057-12-26 07:18	> 1 w	0.1871165	0.1539158	0.0110942
EARTH	2063-09-08 20:15	> 1 d	0.0439022	0.0025887	0.0612612
EARTH	2071-02-06 17:40	> 1 w	0.1261733	0.0233271	0.0343255
EARTH	2076-09-11 06:56	> 1 w	0.0073035	0.0027694	0.1037696
EARTH	2090-02-28 03:36	> 1 mo	0.0757946	0.0172637	8.2274471
EARTH	2096-02-04 01:19	> 1 mo	0.1267052	0.0002063	6.4797929
EARTH	2101-12-03 04:13	> 1 mo	0.1956327	0.1754606	0.1020001
EARTH	2107-09-30 11:25	> 1 mo	0.1153965	0.0074865	2.7059926
EARTH	2113-09-07 06:08	> 1 mo	0.0824879	0.0262591	0.1423801

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
290.81322185	246.83115293	0.00224697	MINIMUM
66.89269217	53.50574368	0.01652638	MINIMUM
358.69920317	330.14835592	0.19836680	SADDLE
179.15355403	150.35607307	0.43444991	SADDLE
358.02729680	149.27881050	1.81573347	SADDLE
178.86561296	330.14698729	2.41900096	MAXIMUM

Download:

MOID Plots

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