Asteroids

488515 2001FE90 help

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

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.976

Aphelion (Q)

2.893

Eccentricity (e)

0.495

Inclination (i)

8.8

deg

Orbit period (P)

982.7

Earth MOID

0.01289

U parameter

0.0

Next Earth close approach

Date

2044-06-03

Nominal distance (from Earth center)

0.08129

12161093

Maximum Brightness

19.3

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

20.6

mag

Diameter

200 - 500*

Taxonomic type

Rotation period (T)

0.4777

Discovery Information

Discovery Date

2001-03-26

Observatory

Lowell Observatory-LONEOS

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

1.934406

1-sigma variation

4.845E-9

Unit

Eccentricity (e)

Value

0.495309

1-sigma variation

1.472E-8

Unit

Inclination (i)

Value

8.8130

1-sigma variation

6.491E-6

Unit

Long. of Ascending Node (Ω)

Value

98.3828

1-sigma variation

4.767E-6

Unit

Arg. of Perihelion (ω)

Value

145.4456

1-sigma variation

9.697E-6

Unit

Mean Anomaly (M)

Value

329.86974

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.976278

1-sigma variation

Unit

Aphelion distance

Value

2.892534

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.482587

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.020491

1-sigma variation

Unit

MOID

Value

0.012889

1-sigma variation

Unit

Orbit Period

Value

982.6976

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.34716E-17	2.57990E-17	-1.17203E-14	-9.96939E-15	-4.58656E-16	-3.38220E-14
e	2.57990E-17	2.16799E-16	-5.11231E-15	3.46857E-15	-1.21203E-13	-2.16205E-15
i	-1.17203E-14	-5.11231E-15	4.21344E-11	-1.22004E-11	1.28714E-11	1.79719E-11
Ω	-9.96939E-15	3.46857E-15	-1.22004E-11	2.27214E-11	-2.54370E-11	1.66925E-11
ω	-4.58656E-16	-1.21203E-13	1.28714E-11	-2.54370E-11	9.40226E-11	-2.19488E-11
M	-3.38220E-14	-2.16205E-15	1.79719E-11	1.66925E-11	-2.19488E-11	5.55211E-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

0.4777

Unit

Source

[5]

[6]

Quality

Value

Unit

Source

[5]

[6]

Amplitude

Value

>=1.0

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

Unit

Source

[1]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.2

20.59

Unit

mag

Source

[2]

[7]

Slope Parameter (G)

Value

0.15**

0.11

Unit

mag

Source

[7]

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[8]

Diameter

Value

200 - 500*

Unit

Source

[8]

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

[9]

[2]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	1.) Hicks, M. et al. (2009) href="http://www.astronomerstelegram.org/?read=2116"> ATel#2116 (2001 FE90: An elongated and rapidly rotating near-Earth asteroid)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Hicks, M. et al. (2009) href="http://www.astronomerstelegram.org/?read=2116"> ATel#2116 (2001 FE90: An elongated and rapidly rotating near-Earth asteroid) 2.) 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)
[5]	EARN	1.) Hicks, M. et al. (2009) href="http://www.astronomerstelegram.org/?read=2116"> ATel#2116 (2001 FE90: An elongated and rapidly rotating near-Earth asteroid) 2.) Oey, J. (2011) MPB 38, 221-223. (LIGHTCURVE ANALYSIS OF ASTEROIDS FROM LEURA AND KINGSGROVE OBSERVATORY FOR THE SECOND HALF OF 2009 AND 2010) (..,1685,..,2001FE90) 3.) Koehn, B.W. et al. (2014) MPB 41, 286-300. (LOWELL OBSERVATORY NEAR-EARTH ASTEROID PHOTOMETRIC SURVEY (NEAPS) - 2009 JANUARY THROUGH 2009 JUNE) (433,1943,3554,5011,5604, 5620,5693,8566,14402,16834,22753,35107,52768,68350,85867, 138883,141052,143651,154244,161989,162385,163758,175706, 194386,203217,207945,208023,212546,256412,2001FE90,2004LV3, 2005BC,2005SG19,2008QT3,2008WL60,2009DE47,2009DO111,2009EP2, 2009FD,2009JM2)
[6]	EARN	1.) Hicks, M.; Lawrence, K.; Rhoades, H.; Somers, J; et al. (2009) Astronomer's Telegram 2116. http://www.astronomerstelegram.org
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	Estimation	Estimated from absolute magnitude
[9]	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

5836

Unit

Source

[1]

Unobserved

Value

3037

Unit

Source

[1]

Normalized RMS of residuals

Value

0.663491

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-03-26.30272

Unit

Source

[2]

Last Observation

Value

2017-03-18.28643

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

301 (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

2009-06-30

Unit

Source

[3]

Last Observation

Value

2009-06-30

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

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 488515 2001FE90 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	1950-07-02 12:07	< 1 min	0.0441194	0.0441177	0.0000006
EARTH	2001-05-06 23:36	< 1 min	0.1276062	0.1276059	0.0000001
EARTH	2009-06-28 11:26	< 1 s	0.0179582	0.0179582	0.0000000
EARTH	2044-06-03 18:02	< 1 min	0.0812919	0.0812906	0.0000004
EARTH	2079-04-15 10:32	< 1 min	0.1973731	0.1973721	0.0000003
EARTH	2087-07-04 11:46	< 1 min	0.0487535	0.0487528	0.0000002
EARTH	2114-04-17 19:21	< 1 min	0.1908053	0.1908019	0.0000011
EARTH	2122-07-12 20:30	< 1 min	0.1168718	0.1168653	0.0000022

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
18.26610626	172.45120909	0.01288937	MINIMUM
179.76823816	321.97806806	1.91114074	SADDLE
0.46366616	322.12614599	1.96151210	SADDLE
180.63350115	142.48142056	3.90255633	MAXIMUM

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MOID Plots

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