Asteroids

231937 2001FO32 help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.296

Aphelion (Q)

3.102

Eccentricity (e)

0.826

Inclination (i)

39.0

deg

Orbit period (P)

809.0

Earth MOID

0.00249

U parameter

0.0

Next Earth close approach

Date

2052-03-22

Nominal distance (from Earth center)

0.01894

2832953

Maximum Brightness

10.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.4

mag

Diameter

900 - 2000*

Taxonomic type

S/Sr

Rotation period (T)

Discovery Information

Discovery Date

2001-03-23

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

1.699209

1-sigma variation

3.234E-9

Unit

Eccentricity (e)

Value

0.825785

1-sigma variation

5.941E-8

Unit

Inclination (i)

Value

39.0130

1-sigma variation

2.074E-5

Unit

Long. of Ascending Node (Ω)

Value

181.6770

1-sigma variation

2.577E-6

Unit

Arg. of Perihelion (ω)

Value

123.3890

1-sigma variation

1.060E-5

Unit

Mean Anomaly (M)

Value

109.12755

1-sigma variation

1.825E-6

Unit

Perihelion distance

Value

0.296028

1-sigma variation

Unit

Aphelion distance

Value

3.102390

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.005614

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.631961

1-sigma variation

Unit

MOID

Value

0.002487

1-sigma variation

Unit

Orbit Period

Value

809.0375

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.04591E-17	1.02320E-16	1.55874E-14	5.56907E-15	1.05998E-14	-3.81604E-15
e	1.02320E-16	3.52979E-15	1.44590E-13	6.00691E-14	5.69110E-13	3.03711E-14
i	1.55874E-14	1.44590E-13	4.30135E-10	-1.25578E-11	5.69613E-11	-1.03886E-11
Ω	5.56907E-15	6.00691E-14	-1.25578E-11	6.63969E-12	-8.41068E-13	-1.28553E-12
ω	1.05998E-14	5.69110E-13	5.69613E-11	-8.41068E-13	1.12356E-10	7.32860E-12
M	-3.81604E-15	3.03711E-14	-1.03886E-11	-1.28553E-12	7.32860E-12	3.33201E-12

Date of computation: 2026-07-30 09:40 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

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

17.356

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

900 - 2000*

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

9038

Unit

Source

[1]

Unobserved

Value

282

Unit

Source

[1]

Normalized RMS of residuals

Value

0.546999

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-03-23.18068

Unit

Source

[2]

Last Observation

Value

2025-12-19.950842

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

289 (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

2021-03-21

Unit

Source

[3]

Last Observation

Value

2021-03-22

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

2 (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

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Max residual (arcsec):

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Computation parameters

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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 231937 2001FO32 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	1950-03-23 14:42	< 1 min	0.0332118	0.0332108	0.0000003
EARTH	1970-03-15 14:19	< 1 min	0.1587714	0.1587705	0.0000003
EARTH	2001-03-28 19:47	< 1 s	0.1653573	0.1653569	0.0000001
EARTH	2021-03-21 16:02	< 1 s	0.0134788	0.0134787	0.0000000
EARTH	2052-03-22 18:56	< 1 min	0.0189371	0.0189357	0.0000005
EARTH	2103-03-23 01:57	< 1 min	0.0211217	0.0211031	0.0000062

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
300.11898866	76.18628768	0.00248745	MINIMUM
42.70478976	298.24863341	0.50276157	MINIMUM
352.77233804	180.43738477	0.79867195	SADDLE
354.75126234	8.74021487	1.23789640	SADDLE
176.33114997	26.19201399	2.32542462	SADDLE
182.05727769	208.08132272	4.00244095	MAXIMUM

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MOID Plots

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