Asteroids

2018AN18 help

Last update: 2025-09-10 09:18 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.285

Aphelion (Q)

3.852

Eccentricity (e)

0.500

Inclination (i)

28.4

deg

Orbit period (P)

1503.5

Earth MOID

0.56259

U parameter

1.6

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.7

mag

Diameter

300 - 700*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-01-11

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

2.568446

1-sigma variation

3.922E-7

Unit

Eccentricity (e)

Value

0.499831

1-sigma variation

3.293E-7

Unit

Inclination (i)

Value

28.3630

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

106.1344

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

276.4274

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

9.32482

1-sigma variation

0.00008

Unit

Perihelion distance

Value

1.284657

1-sigma variation

Unit

Aphelion distance

Value

3.852234

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.840978

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.022982

1-sigma variation

Unit

MOID

Value

0.562585

1-sigma variation

Unit

Orbit Period

Value

1503.5019

1-sigma variation

Unit

U parameter

Value

1.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.53798E-13	-4.48882E-14	-1.53003E-11	-1.58326E-11	-8.23754E-11	2.70634E-11
e	-4.48882E-14	1.08437E-13	-8.57916E-12	-3.79422E-12	6.21318E-12	2.07110E-12
i	-1.53003E-11	-8.57916E-12	3.96678E-9	3.20468E-9	1.02255E-8	-4.05519E-9
Ω	-1.58326E-11	-3.79422E-12	3.20468E-9	2.90315E-9	9.60025E-9	-3.67014E-9
ω	-8.23754E-11	6.21318E-12	1.02255E-8	9.60025E-9	4.80308E-8	-1.64597E-8
M	2.70634E-11	2.07110E-12	-4.05519E-9	-3.67014E-9	-1.64597E-8	5.87491E-9

Date of computation: 2025-09-10 09:18 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

19.73

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

300 - 700*

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

2773

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.489191

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-01-11.55984

Unit

Source

[2]

Last Observation

Value

2025-08-15.61926

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

29 (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

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
24.97541949	327.22334084	0.56258527	MINIMUM
333.87694614	234.51624275	0.61314252	MINIMUM
352.48150067	268.25902832	0.62752314	SADDLE
357.93319341	98.93722157	2.22027809	SADDLE
178.74699653	101.02005327	3.00482921	SADDLE
180.14673478	281.93880269	4.75462732	MAXIMUM

Download:

MOID Plots

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