Asteroids

2018ER1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.917

Aphelion (Q)

1.104

Eccentricity (e)

0.092

Inclination (i)

6.4

deg

Orbit period (P)

370.9

Earth MOID

0.01290

U parameter

5.1

Next Earth close approach

Date

2082-04-01

Nominal distance (from Earth center)

0.15114

22609899

Maximum Brightness

24.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.7

mag

Diameter

19 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-03-08

Observatory

Pan-STARRS 1, 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

1.010240

1-sigma variation

0.000008

Unit

Eccentricity (e)

Value

0.092481

1-sigma variation

0.000023

Unit

Inclination (i)

Value

6.3865

1-sigma variation

0.0017

Unit

Long. of Ascending Node (Ω)

Value

187.8104

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

101.3346

1-sigma variation

0.0068

Unit

Mean Anomaly (M)

Value

105.68261

1-sigma variation

0.00562

Unit

Perihelion distance

Value

0.916812

1-sigma variation

Unit

Aphelion distance

Value

1.103668

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.020629

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.017878

1-sigma variation

Unit

MOID

Value

0.012901

1-sigma variation

Unit

Orbit Period

Value

370.8815

1-sigma variation

Unit

U parameter

Value

5.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.26928E-11	-1.81302E-10	-1.30087E-8	-2.70400E-9	5.39879E-8	-4.39861E-8
e	-1.81302E-10	5.37071E-10	3.84442E-8	7.89172E-9	-1.55378E-7	1.24180E-7
i	-1.30087E-8	3.84442E-8	2.75261E-6	5.65655E-7	-1.11537E-5	8.93159E-6
Ω	-2.70400E-9	7.89172E-9	5.65655E-7	1.17195E-7	-2.32461E-6	1.88021E-6
ω	5.39879E-8	-1.55378E-7	-1.11537E-5	-2.32461E-6	4.65372E-5	-3.80573E-5
M	-4.39861E-8	1.24180E-7	8.93159E-6	1.88021E-6	-3.80573E-5	3.15784E-5

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

25.697

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

19 - 40*

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

2720

Unit

Source

[1]

Normalized RMS of residuals

Value

0.602735

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-03-08.36852

Unit

Source

[2]

Last Observation

Value

2018-04-05.28395

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

64 (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 2018ER1 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	1950-04-03 13:11	28.5	0.1219123	0.1180781	0.0012782
EARTH	1951-04-05 10:34	34.1	0.0420436	0.0353911	0.0022454
EARTH	1952-04-03 18:12	195.9	0.0283973	0.0225574	0.0020906
EARTH	1953-03-18 19:25	1023.7	0.1007148	0.0956043	0.0017166
EARTH	1954-02-06 19:53	> 1 d	0.1518390	0.1501711	0.0005616
EARTH	1954-07-13 22:00	> 1 d	0.1461836	0.1460547	0.0000439
EARTH	1954-12-28 17:19	> 1 d	0.1643973	0.1640745	0.0001077
EARTH	1955-09-04 09:49	319.0	0.1104261	0.1096461	0.0002605
EARTH	1956-10-02 21:05	45.1	0.0369767	0.0360542	0.0003080
EARTH	1957-10-08 17:05	78.4	0.0343417	0.0318403	0.0008390
EARTH	1958-10-13 18:42	50.0	0.1227058	0.1198118	0.0009649
EARTH	2016-04-02 10:23	3.5	0.1182791	0.1180666	0.0000708
EARTH	2017-04-04 05:39	1.6	0.0326121	0.0324851	0.0000423
EARTH	2018-04-02 20:23	< 1 min	0.0398457	0.0398173	0.0000095
EARTH	2019-03-12 23:01	17.4	0.1098900	0.1097396	0.0000501
EARTH	2020-02-02 18:11	59.7	0.1545421	0.1543704	0.0000572
EARTH	2020-07-16 16:59	100.1	0.1454187	0.1453515	0.0000224
EARTH	2020-12-25 08:22	111.8	0.1637617	0.1636618	0.0000333
EARTH	2021-09-04 09:04	69.9	0.1087168	0.1085728	0.0000480
EARTH	2022-10-02 15:49	21.2	0.0376823	0.0373766	0.0001020
EARTH	2023-10-08 14:03	11.4	0.0320861	0.0317528	0.0001112
EARTH	2024-10-12 20:01	2.6	0.1189015	0.1187542	0.0000491
EARTH	2082-04-01 11:23	122.5	0.1511378	0.1398292	0.0037715
EARTH	2083-04-03 19:16	85.7	0.0614028	0.0510240	0.0034877
EARTH	2084-04-02 16:43	152.6	0.0246575	0.0192338	0.0020433
EARTH	2085-03-12 17:58	947.5	0.1090802	0.1057187	0.0011271
EARTH	2086-01-26 21:44	527.4	0.1596294	0.1595632	0.0000232
EARTH	2086-07-25 19:06	554.1	0.1408871	0.1407239	0.0000546
EARTH	2086-12-11 22:08	476.2	0.1604241	0.1602415	0.0000620
EARTH	2087-09-22 00:22	406.8	0.0794936	0.0765470	0.0009826
EARTH	2088-10-05 12:11	162.4	0.0169648	0.0133014	0.0015348
EARTH	2089-10-13 03:08	60.2	0.1431717	0.1349470	0.0027432

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
77.99564798	271.00252082	0.01255454	MINIMUM
269.53334706	90.12477769	0.01522011	MINIMUM
353.67081388	179.93565233	0.14594273	SADDLE
173.86802863	1.27863822	0.16592037	SADDLE
358.36456401	5.20717046	1.89757604	SADDLE
179.63269470	186.48533968	2.11644292	MAXIMUM

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MOID Plots

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