Asteroids

153958 2002AM31 help

Last update: 2025-05-21 08:47 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.934

Aphelion (Q)

2.472

Eccentricity (e)

0.451

Inclination (i)

4.6

deg

Orbit period (P)

811.9

Earth MOID

0.03139

U parameter

0.0

Next Earth close approach

Date

2032-07-29

Nominal distance (from Earth center)

0.03406

5095819

Maximum Brightness

16.1

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

18.3

mag

Diameter

400

Taxonomic type

Scomp

Rotation period (T)

Discovery Information

Discovery Date

2002-01-14

Observatory

Lincoln Laboratory ETS, New Mexico

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.703212

1-sigma variation

2.281E-9

Unit

Eccentricity (e)

Value

0.451455

1-sigma variation

8.180E-9

Unit

Inclination (i)

Value

4.6444

1-sigma variation

1.796E-6

Unit

Long. of Ascending Node (Ω)

Value

144.3640

1-sigma variation

1.105E-5

Unit

Arg. of Perihelion (ω)

Value

197.9495

1-sigma variation

8.784E-6

Unit

Mean Anomaly (M)

Value

255.59964

1-sigma variation

4.682E-6

Unit

Perihelion distance

Value

0.934288

1-sigma variation

Unit

Aphelion distance

Value

2.472135

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.388771

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.063255

1-sigma variation

Unit

MOID

Value

0.031394

1-sigma variation

Unit

Orbit Period

Value

811.8979

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.20322E-18	5.44538E-18	-1.09343E-15	6.79902E-15	-5.36706E-15	-1.05202E-14
e	5.44538E-18	6.69154E-17	-9.22006E-15	7.04775E-14	-5.78724E-14	-1.46330E-14
i	-1.09343E-15	-9.22006E-15	3.22420E-12	-1.92479E-11	1.47421E-11	3.55002E-12
Ω	6.79902E-15	7.04775E-14	-1.92479E-11	1.22170E-10	-9.62075E-11	-2.14701E-11
ω	-5.36706E-15	-5.78724E-14	1.47421E-11	-9.62075E-11	7.71623E-11	1.65102E-11
M	-1.05202E-14	-1.46330E-14	3.55002E-12	-2.14701E-11	1.65102E-11	2.19246E-11

Date of computation: 2025-05-21 08:47 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

[4]

Quality

Value

3,B,R

Unit

Source

[4]

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

Scomp

Unit

Source

[1]

[2]

Taxonomy (all)

Value

Unit

Source

[1]

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.299

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[-]

Diameter

Value

400

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[7]

[1]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[3]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Perna, D. et al. (2016) Astron. J. 151, 11(14p). (GRASPING THE NATURE OF POTENTIALLY HAZARDOUS ASTEROIDS) (spectra of 14 PHAs)
[2]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Taylor, P.A. et al (2013) DPS 45, 208-08. (abstract) (Physical Characterization of Binary Near-Earth Asteroid (153958) 2002 AM31) 2.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Taylor, P.A. et al (2013) DPS 45, 208-08. (abstract) (Physical Characterization of Binary Near-Earth Asteroid (153958) 2002 AM31)
[7]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

15330

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.499438

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1983-05-07.62443

Unit

Source

[2]

Last Observation

Value

2025-04-26.329935

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

828 (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

2012-07-12

Unit

Source

[3]

Last Observation

Value

2012-08-07

Unit

Source

[3]

Delay (Discarded)

Value

7 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

8 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 153958 2002AM31 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	1963-09-29 01:07	< 1 min	0.0677064	0.0677062	0.0000001
EARTH	1983-10-20 04:40	< 1 min	0.0948450	0.0948443	0.0000002
EARTH	1992-07-03 15:44	< 1 min	0.1995323	0.1995315	0.0000003
EARTH	2012-07-22 23:39	< 1 s	0.0351448	0.0351448	0.0000000
EARTH	2032-07-29 03:33	< 1 min	0.0340634	0.0340632	0.0000001
EARTH	2052-08-21 00:40	< 1 min	0.0700309	0.0700296	0.0000004
EARTH	2072-09-25 18:46	< 1 min	0.0710204	0.0710194	0.0000003
EARTH	2092-10-18 20:18	< 1 min	0.0861581	0.0861540	0.0000014
EARTH	2121-07-22 06:31	< 1 min	0.0438306	0.0438279	0.0000009

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
335.44504433	201.49826866	0.03139385	MINIMUM
19.96954820	272.90174608	0.06410682	MINIMUM
1.60657109	243.53014064	0.07774894	SADDLE
179.50728617	59.39488867	1.48100589	SADDLE
358.43242460	58.32255801	1.92566535	SADDLE
179.29154922	239.25763946	3.48004786	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out