Asteroids

2009FF help

Last update: 2026-01-31 07:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.783

Aphelion (Q)

2.163

Eccentricity (e)

0.468

Inclination (i)

1.0

deg

Orbit period (P)

653.2

Earth MOID

0.01466

U parameter

0.0

Next Earth close approach

Date

2043-05-11

Nominal distance (from Earth center)

0.1593

23831258

Maximum Brightness

23.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

110 - 240*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2009-03-16

Observatory

Mt. Lemmon Survey

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

1.473329

1-sigma variation

3.137E-9

Unit

Eccentricity (e)

Value

0.468419

1-sigma variation

3.152E-8

Unit

Inclination (i)

Value

0.9793

1-sigma variation

2.797E-7

Unit

Long. of Ascending Node (Ω)

Value

263.3578

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

13.5386

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

66.34431

1-sigma variation

9.297E-7

Unit

Perihelion distance

Value

0.783194

1-sigma variation

Unit

Aphelion distance

Value

2.163464

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.227301

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.128780

1-sigma variation

Unit

MOID

Value

0.014659

1-sigma variation

Unit

Orbit Period

Value

653.2028

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.84278E-18	7.40036E-17	9.57684E-17	6.32819E-14	-7.83528E-14	1.58607E-15
e	7.40036E-17	9.93415E-16	1.28307E-16	9.64991E-13	-1.16338E-12	2.46845E-14
i	9.57684E-17	1.28307E-16	7.82137E-14	4.96729E-11	-4.97389E-11	1.98749E-14
Ω	6.32819E-14	9.64991E-13	4.96729E-11	3.74955E-8	-3.76534E-8	1.12910E-11
ω	-7.83528E-14	-1.16338E-12	-4.97389E-11	-3.76534E-8	3.78518E-8	-1.66185E-11
M	1.58607E-15	2.46845E-14	1.98749E-14	1.12910E-11	-1.66185E-11	8.64420E-13

Date of computation: 2026-01-31 07:00 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

21.96

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

110 - 240*

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

[-]

Download this part as:

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

15195

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.512378

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1984-04-05.51791

Unit

Source

[2]

Last Observation

Value

2025-11-11.708252

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

599 (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

2025-09-11

Unit

Source

[3]

Last Observation

Value

2025-09-13

Unit

Source

[3]

Delay (Discarded)

Value

3 (1)

Unit

Source

[1]

Doppler (Discarded)

Value

4 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

7 (1)

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 2009FF 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	1950-09-06 10:10	< 1 min	0.0589869	0.0589851	0.0000006
EARTH	1959-05-25 04:59	< 1 min	0.1950890	0.1950881	0.0000003
EARTH	1984-04-15 21:48	< 1 min	0.0218440	0.0218436	0.0000001
EARTH	1991-09-17 22:59	< 1 min	0.0863025	0.0863009	0.0000005
EARTH	2009-05-15 16:05	< 1 min	0.1721454	0.1721451	0.0000001
EARTH	2018-04-06 22:21	< 1 s	0.1327504	0.1327502	0.0000001
EARTH	2025-09-11 17:30	< 1 s	0.0174684	0.0174684	0.0000000
EARTH	2043-05-11 19:27	< 1 min	0.1593021	0.1593006	0.0000005
EARTH	2052-04-06 16:48	< 1 min	0.1348026	0.1347991	0.0000012
EARTH	2059-09-13 23:01	< 1 min	0.0232427	0.0232393	0.0000012
EARTH	2068-08-16 00:23	< 1 min	0.1630696	0.1630646	0.0000017
EARTH	2086-05-25 12:00	< 1 min	0.1924533	0.1924501	0.0000010
MARS	2088-07-20 13:43	< 1 min	0.0433328	0.0433293	0.0000012
EARTH	2095-04-19 19:41	< 1 min	0.0382068	0.0382030	0.0000013
EARTH	2104-04-11 22:57	< 1 min	0.0739752	0.0739692	0.0000020
EARTH	2120-09-17 04:53	< 1 min	0.0517322	0.0517203	0.0000040

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
312.82083275	102.68741412	0.01465893	MINIMUM
47.48135742	248.84494404	0.01716538	MINIMUM
0.20770977	175.84143432	0.23495196	SADDLE
180.07015400	355.66598232	1.17988434	SADDLE
0.17631503	355.79135340	1.76678286	SADDLE
180.06423684	175.66363731	3.18157534	MAXIMUM

Download:

MOID Plots

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