Asteroids

152680 1998KJ9 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.522

Aphelion (Q)

2.374

Eccentricity (e)

0.640

Inclination (i)

10.9

deg

Orbit period (P)

636.2

Earth MOID

0.00590

U parameter

0.0

Next Earth close approach

Date

2044-01-05

Nominal distance (from Earth center)

0.07313

10939718

Maximum Brightness

17.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.5

mag

Diameter

300 - 800*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1998-05-27

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

1.447687

1-sigma variation

2.145E-9

Unit

Eccentricity (e)

Value

0.639640

1-sigma variation

4.066E-8

Unit

Inclination (i)

Value

10.9294

1-sigma variation

5.482E-6

Unit

Long. of Ascending Node (Ω)

Value

98.5394

1-sigma variation

2.699E-5

Unit

Arg. of Perihelion (ω)

Value

260.1049

1-sigma variation

2.619E-5

Unit

Mean Anomaly (M)

Value

243.02771

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.521689

1-sigma variation

Unit

Aphelion distance

Value

2.373684

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.022737

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.247349

1-sigma variation

Unit

MOID

Value

0.005897

1-sigma variation

Unit

Orbit Period

Value

636.2243

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.60200E-18	5.90936E-17	7.66881E-16	1.03672E-15	8.12256E-15	-3.41886E-14
e	5.90936E-17	1.65312E-15	1.48894E-14	4.41514E-15	1.70486E-13	-3.66780E-13
i	7.66881E-16	1.48894E-14	3.00476E-11	-3.01242E-11	3.38297E-11	-1.01557E-11
Ω	1.03672E-15	4.41514E-15	-3.01242E-11	7.28417E-10	-6.88168E-10	-6.14396E-11
ω	8.12256E-15	1.70486E-13	3.38297E-11	-6.88168E-10	6.85942E-10	-1.42007E-11
M	-3.41886E-14	-3.66780E-13	-1.01557E-11	-6.14396E-11	-1.42007E-11	2.78010E-10

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

19.455

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 - 800*

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

[-]

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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

12844

Unit

Source

[1]

Unobserved

Value

216

Unit

Source

[1]

Normalized RMS of residuals

Value

0.593286

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1990-01-01.40556

Unit

Source

[2]

Last Observation

Value

2025-03-02.326723

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

266 (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

Close Approaches for 152680 1998KJ9 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	1983-01-05 05:44	< 1 min	0.0914620	0.0914614	0.0000002
EARTH	1989-12-30 08:21	< 1 s	0.0302239	0.0302228	0.0000004
EARTH	1998-06-08 23:44	< 1 s	0.0832190	0.0832188	0.0000001
EARTH	2005-05-31 00:20	< 1 s	0.1570570	0.1570566	0.0000001
EARTH	2044-01-05 00:22	< 1 min	0.0731275	0.0731259	0.0000005
EARTH	2050-12-27 17:56	< 1 min	0.0968214	0.0968203	0.0000004
EARTH	2052-06-14 22:43	< 1 min	0.1533759	0.1533747	0.0000004
EARTH	2059-06-06 01:21	< 1 min	0.0820611	0.0820607	0.0000001
EARTH	2105-01-03 14:57	< 1 min	0.0298281	0.0298250	0.0000010
EARTH	2111-12-30 03:24	< 1 min	0.0831268	0.0831249	0.0000006
EARTH	2113-06-18 05:34	< 1 min	0.1727748	0.1727718	0.0000010
EARTH	2120-06-10 17:46	< 1 min	0.0806179	0.0806142	0.0000012

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
59.81836380	358.05782674	0.00597615	MINIMUM
299.30862936	153.73549368	0.07567349	MINIMUM
358.87650337	255.57159699	0.50079663	SADDLE
179.86000545	75.77976017	1.40764401	SADDLE
358.27044575	74.23066546	1.51136505	SADDLE
179.40416848	255.55957887	3.36507385	MAXIMUM

Download:

MOID Plots

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