Asteroids

152664 1998FW4 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.721

Aphelion (Q)

4.319

Eccentricity (e)

0.714

Inclination (i)

3.4

deg

Orbit period (P)

1461.0

Earth MOID

0.01509

U parameter

0.0

A₂

20.4

10^-15au/days²

Next Earth close approach

Date

2029-09-30

Nominal distance (from Earth center)

0.02614

3911150

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.7

mag

Diameter

340

Taxonomic type

Rotation period (T)

17.38

Discovery Information

Discovery Date

1998-03-20

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.519807

1-sigma variation

2.390E-9

Unit

Eccentricity (e)

Value

0.713929

1-sigma variation

6.715E-9

Unit

Inclination (i)

Value

3.4133

1-sigma variation

4.051E-6

Unit

Long. of Ascending Node (Ω)

Value

353.5330

1-sigma variation

1.241E-5

Unit

Arg. of Perihelion (ω)

Value

85.6065

1-sigma variation

1.254E-5

Unit

Mean Anomaly (M)

Value

51.53817

1-sigma variation

1.699E-7

Unit

Perihelion distance

Value

0.720845

1-sigma variation

Unit

Aphelion distance

Value

4.318769

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.165960

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.312438

1-sigma variation

Unit

MOID

Value

0.015090

1-sigma variation

Unit

Orbit Period

Value

1460.9969

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

20.37881

1-sigma variation

3.79737

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	5.71109E-18	-1.09311E-17	7.26683E-15	1.32548E-14	-1.75129E-14	2.27906E-16	8.06375E-9
e	-1.09311E-17	4.50847E-17	-2.30791E-15	1.79057E-14	-3.11735E-15	-5.47183E-16	-1.24196E-8
i	7.26683E-15	-2.30791E-15	1.64093E-11	4.58347E-11	-4.82467E-11	1.79631E-13	1.37070E-5
Ω	1.32548E-14	1.79057E-14	4.58347E-11	1.54131E-10	-1.53179E-10	2.81519E-13	3.40399E-5
ω	-1.75129E-14	-3.11735E-15	-4.82467E-11	-1.53179E-10	1.57255E-10	-4.81844E-13	-3.94615E-5
M	2.27906E-16	-5.47183E-16	1.79631E-13	2.81519E-13	-4.81844E-13	2.88701E-14	2.02127E-7
A₂	8.06375E-9	-1.24196E-8	1.37070E-5	3.40399E-5	-3.94615E-5	2.02127E-7	1.44200E1

Date of computation: 2026-03-17 23:26 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

17.38

Unit

Source

[5]

Quality

Value

Unit

Source

[5]

Amplitude

Value

0.34

Unit

mag

Source

[5]

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

Xc;Scomp

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.687

Unit

mag

Source

[6]

Slope Parameter (G)

Value

0.15**

Unit

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.211

Unit

Source

[1]

Diameter

Value

340

Unit

Source

[1]

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

Unit

Source

[7]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) N. G. Simion et al, Spectral properties of near-Earth objects with low-Jovian Tisserand invariant (2021)
[2]	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)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Somers, J.M. et al. (2010) DPS 42, 1316. (abstract) (Optical Characterization Of Planetary Radar Targets, Low-deltaV, And Potentially Hazardous Asteroids: Results From 2009-2010) 2.) 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)
[5]	EARN	1.) Warner, B.D. (2014) MPB 41,41-47. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2013 JUNE-SEPTEMBER) (1627,9950,11405,24445,152664,168378,329437, 350988,361071,368664,2006EE1,2013OM9,2013QJ10)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[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

11529

Unit

Source

[1]

Unobserved

Value

219

Unit

Source

[1]

Normalized RMS of residuals

Value

0.418788

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1994-03-09.19653

Unit

Source

[2]

Last Observation

Value

2025-10-01.239904

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

956 (6)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2009-09-26

Unit

Source

[3]

Last Observation

Value

2013-09-26

Unit

Source

[3]

Delay (Discarded)

Value

11 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

7 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

18 (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

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 152664 1998FW4 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	1966-09-17 19:58	< 1 min	0.0240792	0.0240772	0.0000007
EARTH	1994-03-01 09:20	< 1 min	0.0740029	0.0740014	0.0000005
VENUS	1998-01-12 03:54	< 1 s	0.0204013	0.0204011	0.0000000
EARTH	2005-10-10 13:10	< 1 s	0.1558677	0.1558677	0.0000000
EARTH	2009-09-29 18:43	< 1 s	0.0221823	0.0221823	0.0000000
EARTH	2013-09-24 18:20	< 1 s	0.0449975	0.0449975	0.0000000
EARTH	2017-09-16 23:49	< 1 s	0.1758015	0.1758014	0.0000000
EARTH	2021-09-23 18:49	< 1 s	0.1150476	0.1150476	0.0000000
EARTH	2025-09-29 18:58	< 1 s	0.0257538	0.0257538	0.0000000
EARTH	2029-09-30 00:22	< 1 s	0.0261444	0.0261444	0.0000000
EARTH	2033-10-11 12:50	< 1 s	0.0733149	0.0733148	0.0000000
EARTH	2046-01-29 17:07	< 1 s	0.1204247	0.1204245	0.0000000
EARTH	2094-10-08 21:57	< 1 min	0.0283564	0.0283560	0.0000001
EARTH	2103-02-23 23:14	< 1 min	0.1574322	0.1574244	0.0000026

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
327.47337785	267.73533001	0.01507628	MINIMUM
31.82128847	46.96327300	0.02464164	MINIMUM
359.55123234	337.25515570	0.26873304	SADDLE
359.47676599	157.09320606	1.73688359	SADDLE
179.91803443	157.70887812	3.30501824	SADDLE
179.91303309	337.70962741	5.30292157	MAXIMUM

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MOID Plots

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