Asteroids

332446 2008AF4 help

Last update: 2025-12-21 12:45 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.814

Aphelion (Q)

1.946

Eccentricity (e)

0.410

Inclination (i)

8.9

deg

Orbit period (P)

592.1

Earth MOID

0.00159

U parameter

0.0

Next Earth close approach

Date

2033-12-01

Nominal distance (from Earth center)

0.18553

27755447

Maximum Brightness

21.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.6

mag

Diameter

300 - 700*

Taxonomic type

S/Sr

Rotation period (T)

Discovery Information

Discovery Date

2008-01-10

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.379969

1-sigma variation

2.217E-9

Unit

Eccentricity (e)

Value

0.409949

1-sigma variation

2.037E-8

Unit

Inclination (i)

Value

8.9318

1-sigma variation

3.887E-6

Unit

Long. of Ascending Node (Ω)

Value

109.3025

1-sigma variation

6.604E-6

Unit

Arg. of Perihelion (ω)

Value

293.3741

1-sigma variation

7.245E-6

Unit

Mean Anomaly (M)

Value

29.75794

1-sigma variation

1.962E-6

Unit

Perihelion distance

Value

0.814253

1-sigma variation

Unit

Aphelion distance

Value

1.945686

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.003648

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.353246

1-sigma variation

Unit

MOID

Value

0.001589

1-sigma variation

Unit

Orbit Period

Value

592.1102

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.91515E-18	-6.95437E-18	3.69306E-15	2.90479E-15	-5.17471E-15	-2.33195E-15
e	-6.95437E-18	4.15067E-16	-4.09722E-15	-5.27422E-15	-5.67555E-14	6.58519E-15
i	3.69306E-15	-4.09722E-15	1.51085E-11	1.46496E-11	-1.58456E-11	-2.66324E-12
Ω	2.90479E-15	-5.27422E-15	1.46496E-11	4.36146E-11	-3.81690E-11	-6.32003E-12
ω	-5.17471E-15	-5.67555E-14	-1.58456E-11	-3.81690E-11	5.24966E-11	2.22870E-12
M	-2.33195E-15	6.58519E-15	-2.66324E-12	-6.32003E-12	2.22870E-12	3.84949E-12

Date of computation: 2025-12-21 12:45 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

S/Sr

Unit

Source

[1]

Taxonomy (all)

Value

S/Sr

Unit

Source

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.563

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

300 - 700*

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.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[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

8603

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.36288

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2002-06-01.33892

Unit

Source

[2]

Last Observation

Value

2025-12-20.548516

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1196 (4)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2021-01-06

Unit

Source

[3]

Last Observation

Value

2021-01-06

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (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 332446 2008AF4 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1951-01-16 01:38	< 1 s	0.1033211	0.1033205	0.0000002
EARTH	1955-08-22 03:17	< 1 s	0.1047938	0.1047936	0.0000001
EARTH	1968-09-15 08:11	< 1 min	0.1876256	0.1876253	0.0000001
EARTH	1994-12-08 18:08	< 1 min	0.1694229	0.1694229	0.0000000
EARTH	2008-01-04 21:36	< 1 s	0.0517526	0.0517524	0.0000001
EARTH	2012-08-10 19:47	< 1 s	0.1935588	0.1935585	0.0000001
EARTH	2021-01-06 21:51	< 1 s	0.0245731	0.0245730	0.0000000
EARTH	2033-12-01 08:03	< 1 min	0.1855337	0.1855335	0.0000001
EARTH	2059-08-23 14:38	< 1 min	0.1112324	0.1112319	0.0000002
EARTH	2068-01-13 15:24	< 1 min	0.0490205	0.0490192	0.0000004
EARTH	2072-08-14 09:54	< 1 s	0.1453565	0.1453563	0.0000001
EARTH	2081-01-06 07:29	< 1 min	0.0347171	0.0347154	0.0000006
EARTH	2106-09-18 00:43	< 1 min	0.1895628	0.1895594	0.0000012
EARTH	2115-01-21 17:14	< 1 min	0.1653193	0.1653110	0.0000028
EARTH	2119-08-20 08:40	< 1 min	0.1084432	0.1084408	0.0000008

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
45.63137807	7.32236249	0.00158875	MINIMUM
306.68210436	226.09840513	0.10203358	MINIMUM
353.10827695	292.01973192	0.22306208	SADDLE
177.87945979	119.79623756	0.95748404	SADDLE
357.03660393	118.10419103	1.81885623	SADDLE
179.40774105	300.80607319	2.93073143	MAXIMUM

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MOID Plots

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