Asteroids

2018AM12 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.811

Aphelion (Q)

1.024

Eccentricity (e)

0.116

Inclination (i)

21.7

deg

Orbit period (P)

320.9

Earth MOID

0.00725

U parameter

0.6

Next Earth close approach

Date

2040-01-08

Nominal distance (from Earth center)

0.18793

28114459

Maximum Brightness

20.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.2

mag

Diameter

160 - 300*

Taxonomic type

Rotation period (T)

0.2106

Discovery Information

Discovery Date

2018-01-15

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

0.917276

1-sigma variation

6.380E-9

Unit

Eccentricity (e)

Value

0.116186

1-sigma variation

1.530E-7

Unit

Inclination (i)

Value

21.6686

1-sigma variation

2.292E-5

Unit

Long. of Ascending Node (Ω)

Value

288.8348

1-sigma variation

8.672E-6

Unit

Arg. of Perihelion (ω)

Value

51.0526

1-sigma variation

4.767E-5

Unit

Mean Anomaly (M)

Value

97.79859

1-sigma variation

0.00008

Unit

Perihelion distance

Value

0.810701

1-sigma variation

Unit

Aphelion distance

Value

1.023850

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.174715

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.007486

1-sigma variation

Unit

MOID

Value

0.007252

1-sigma variation

Unit

Orbit Period

Value

320.8841

1-sigma variation

Unit

U parameter

Value

0.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.07044E-17	-6.42125E-17	1.12748E-14	-1.37107E-14	1.68271E-14	-2.31731E-13
e	-6.42125E-17	2.34132E-14	1.57460E-12	3.30391E-13	7.06608E-12	-1.04973E-11
i	1.12748E-14	1.57460E-12	5.25166E-10	8.00167E-11	4.11744E-10	-7.99277E-10
Ω	-1.37107E-14	3.30391E-13	8.00167E-11	7.51999E-11	4.47261E-11	-6.31702E-11
ω	1.68271E-14	7.06608E-12	4.11744E-10	4.47261E-11	2.27218E-9	-3.48848E-9
M	-2.31731E-13	-1.04973E-11	-7.99277E-10	-6.31702E-11	-3.48848E-9	6.48069E-9

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

0.2106

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

1.2

Unit

mag

Source

[1]

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

21.16

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

160 - 300*

Unit

Source

[3]

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]	EARN	1.) Schwab, E. et al. (2018) MPB 45, 225. (Rotation Period for the Potentially Hazardous Asteroid 2018 AM12)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

5135

Unit

Source

[1]

Unobserved

Value

230

Unit

Source

[1]

Normalized RMS of residuals

Value

0.476726

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-01-09.665126

Unit

Source

[2]

Last Observation

Value

2025-01-31.05399

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

128 (2)

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 2018AM12 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	1960-01-09 14:25	3.5	0.0287162	0.0282389	0.0001591
EARTH	1960-06-26 09:52	31.2	0.1795950	0.1794589	0.0000456
EARTH	1982-01-09 13:51	< 1 min	0.0065945	0.0065930	0.0000005
EARTH	1982-06-29 17:55	< 1 min	0.1749478	0.1749468	0.0000003
EARTH	1989-01-12 23:46	< 1 min	0.1631600	0.1631556	0.0000015
EARTH	1989-07-18 05:20	< 1 min	0.1929020	0.1929002	0.0000006
EARTH	2011-01-08 19:56	< 1 s	0.0798281	0.0798266	0.0000005
EARTH	2018-01-10 17:09	< 1 s	0.0527371	0.0527370	0.0000001
EARTH	2018-07-05 21:06	< 1 min	0.1696175	0.1696173	0.0000001
EARTH	2040-01-08 14:09	< 1 s	0.1879336	0.1879296	0.0000013
EARTH	2047-01-09 12:15	< 1 min	0.0324561	0.0324514	0.0000016
EARTH	2047-06-26 13:29	< 1 min	0.1834948	0.1834936	0.0000004
EARTH	2054-01-11 05:34	< 1 min	0.0729353	0.0729336	0.0000006
EARTH	2054-07-07 23:58	< 1 min	0.1714532	0.1714529	0.0000001
EARTH	2083-01-08 16:58	< 1 min	0.1077076	0.1076849	0.0000076
EARTH	2090-01-10 04:51	< 1 min	0.0200222	0.0199980	0.0000081
EARTH	2090-07-02 23:25	1.3	0.1693008	0.1693001	0.0000002
EARTH	2112-01-10 03:17	1.1	0.0889799	0.0887363	0.0000812
EARTH	2112-06-21 17:40	15.1	0.1998598	0.1997481	0.0000373
EARTH	2119-01-13 06:08	3.2	0.0987428	0.0984413	0.0001005
EARTH	2119-07-13 06:04	23.1	0.1747329	0.1746670	0.0000221

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
123.84083584	6.77316254	0.00737347	MINIMUM
308.09921983	180.79807375	0.16905792	MINIMUM
221.67093238	93.98680305	0.37546739	SADDLE
30.94473357	273.14008998	0.38204003	SADDLE
7.99034942	65.92165566	1.78110167	SADDLE
159.33691512	216.81500192	2.01975167	MAXIMUM

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MOID Plots

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