Asteroids

152664 1998FW4 help

Last update: 2025-03-28 15:40 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.721

Aphelion (Q)

4.328

Eccentricity (e)

0.714

Inclination (i)

3.4

deg

Orbit period (P)

1465.2

Earth MOID

0.01512

U parameter

0.0

A₂

18.0

10^-15au/days²

Next Earth close approach

Date

2025-09-29

Nominal distance (from Earth center)

0.02575

3852717

Maximum Brightness

13.9

mag

Risk

Object is not in risk list

Object is not in priority 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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.524628

1-sigma variation

2.307E-9

Unit

Eccentricity (e)

Value

0.714343

1-sigma variation

7.291E-9

Unit

Inclination (i)

Value

3.4228

1-sigma variation

4.825E-6

Unit

Long. of Ascending Node (Ω)

Value

353.5810

1-sigma variation

1.409E-5

Unit

Arg. of Perihelion (ω)

Value

85.5024

1-sigma variation

1.440E-5

Unit

Mean Anomaly (M)

Value

313.11348

1-sigma variation

1.032E-6

Unit

Perihelion distance

Value

0.721177

1-sigma variation

Unit

Aphelion distance

Value

4.328079

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.165495

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.315592

1-sigma variation

Unit

MOID

Value

0.015118

1-sigma variation

Unit

Orbit Period

Value

1465.1918

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

18.02430

1-sigma variation

5.38122

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	5.32381E-18	-1.95529E-18	-9.44741E-16	-2.61698E-15	2.04344E-15	-2.14141E-15	8.61121E-9
e	-1.95529E-18	5.31603E-17	-6.38731E-15	1.33725E-14	4.03825E-15	-2.27386E-15	-1.27555E-8
i	-9.44741E-16	-6.38731E-15	2.32785E-11	6.23074E-11	-6.63663E-11	1.35865E-12	1.68727E-5
Ω	-2.61698E-15	1.33725E-14	6.23074E-11	1.98555E-10	-2.00049E-10	2.29642E-12	4.29966E-5
ω	2.04344E-15	4.03825E-15	-6.63663E-11	-2.00049E-10	2.07431E-10	-3.13144E-12	-4.85908E-5
M	-2.14141E-15	-2.27386E-15	1.35865E-12	2.29642E-12	-3.13144E-12	1.06496E-12	-2.43846E-6
A₂	8.61121E-9	-1.27555E-8	1.68727E-5	4.29966E-5	-4.85908E-5	-2.43846E-6	2.89575E1

Date of computation: 2025-03-28 15:40 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

19.653

Unit

mag

Source

[6]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.211

Unit

Source

[2]

Diameter

Value

340

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

Radar R

Unit

Source

[7]

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]	EARN	1.) N. G. Simion et al, Spectral properties of near-Earth objects with low-Jovian Tisserand invariant (2021)
[3]	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)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[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

10194

Unit

Source

[1]

Unobserved

Value

1190

Unit

Source

[1]

Normalized RMS of residuals

Value

0.478823

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

2022-02-04.625409

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

578 (3)

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

Close Approaches for 152664 1998FW4 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	1966-09-17 19:58	5.1	0.0240790	0.0240117	0.0000226
EARTH	1994-03-01 09:20	< 1 min	0.0740027	0.0739757	0.0000090
VENUS	1998-01-12 03:54	< 1 min	0.0204012	0.0204004	0.0000003
EARTH	2005-10-10 13:10	< 1 min	0.1558677	0.1558668	0.0000003
EARTH	2009-09-29 18:43	< 1 min	0.0221823	0.0221797	0.0000008
EARTH	2013-09-24 18:20	< 1 s	0.0449975	0.0449974	0.0000000
EARTH	2017-09-16 23:49	< 1 s	0.1758015	0.1758014	0.0000000
EARTH	2021-09-23 18:49	< 1 min	0.1150476	0.1150451	0.0000009
EARTH	2025-09-29 18:58	< 1 min	0.0257538	0.0257479	0.0000020
EARTH	2029-09-30 00:22	< 1 min	0.0261444	0.0261387	0.0000019
EARTH	2033-10-11 12:50	< 1 min	0.0733149	0.0733130	0.0000006
EARTH	2046-01-29 17:07	< 1 min	0.1204248	0.1204239	0.0000003
EARTH	2094-10-08 21:57	5.8	0.0283564	0.0283135	0.0000144
EARTH	2103-02-23 23:14	19.8	0.1574315	0.1567218	0.0002366

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
327.57190274	266.82582004	0.01511835	MINIMUM
31.73742860	45.91876754	0.02493375	MINIMUM
359.56289914	336.28558013	0.26852855	SADDLE
359.48840722	156.12186334	1.73535901	SADDLE
179.91999465	156.72359095	3.31546993	SADDLE
179.91454144	336.72393094	5.31159770	MAXIMUM

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MOID Plots

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