Asteroids

2009FF help

Last update: 2025-07-29 02:36 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.783

Aphelion (Q)

2.164

Eccentricity (e)

0.468

Inclination (i)

1.0

deg

Orbit period (P)

653.4

Earth MOID

0.01502

U parameter

0.0

Next Earth close approach

Date

2025-09-11

Nominal distance (from Earth center)

0.01747

2613188

Maximum Brightness

15.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.7

mag

Diameter

120 - 270*

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.473670

1-sigma variation

4.379E-9

Unit

Eccentricity (e)

Value

0.468493

1-sigma variation

4.356E-8

Unit

Inclination (i)

Value

0.9833

1-sigma variation

4.104E-6

Unit

Long. of Ascending Node (Ω)

Value

265.7979

1-sigma variation

0.0005

Unit

Arg. of Perihelion (ω)

Value

11.1323

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

316.11910

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.783266

1-sigma variation

Unit

Aphelion distance

Value

2.164075

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.227861

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.146092

1-sigma variation

Unit

MOID

Value

0.015024

1-sigma variation

Unit

Orbit Period

Value

653.4298

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.91719E-17	5.52832E-17	-2.33490E-15	1.05500E-13	-1.29495E-13	-2.43243E-14
e	5.52832E-17	1.89739E-15	-4.29063E-15	-8.33307E-14	3.46307E-14	5.86138E-14
i	-2.33490E-15	-4.29063E-15	1.68391E-11	-5.32953E-10	5.37612E-10	3.63917E-15
Ω	1.05500E-13	-8.33307E-14	-5.32953E-10	2.22125E-7	-2.22129E-7	-1.56600E-10
ω	-1.29495E-13	3.46307E-14	5.37612E-10	-2.22129E-7	2.22244E-7	1.09810E-10
M	-2.43243E-14	5.86138E-14	3.63917E-15	-1.56600E-10	1.09810E-10	1.43320E-10

Date of computation: 2025-07-29 02:36 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

21.745

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

120 - 270*

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

12402

Unit

Source

[1]

Unobserved

Value

2715

Unit

Source

[1]

Normalized RMS of residuals

Value

0.773229

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

2018-03-20.52026

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

89 (2)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

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 2125

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 10:11	< 1 min	0.0589842	0.0589808	0.0000011
EARTH	1959-05-25 04:59	< 1 min	0.1950897	0.1950880	0.0000006
EARTH	1984-04-15 21:48	< 1 min	0.0218424	0.0218414	0.0000003
EARTH	1991-09-17 22:59	< 1 min	0.0863000	0.0862980	0.0000007
EARTH	2009-05-15 16:05	< 1 min	0.1721450	0.1721446	0.0000001
EARTH	2018-04-06 22:21	< 1 min	0.1327498	0.1327491	0.0000002
EARTH	2025-09-11 17:30	< 1 min	0.0174681	0.0174678	0.0000001
EARTH	2043-05-11 19:47	4.6	0.1593417	0.1593168	0.0000083
EARTH	2052-04-06 16:57	1.6	0.1347030	0.1346404	0.0000209
EARTH	2059-09-13 23:18	3.6	0.0233538	0.0232840	0.0000233
EARTH	2068-08-16 01:42	18.6	0.1629133	0.1628172	0.0000320
EARTH	2086-05-25 12:58	17.2	0.1925403	0.1924887	0.0000172
MARS	2088-07-20 13:50	1.4	0.0434362	0.0433751	0.0000204
EARTH	2095-04-19 19:56	2.8	0.0383086	0.0382506	0.0000193
EARTH	2104-04-11 22:41	3.2	0.0741491	0.0740451	0.0000346
EARTH	2120-09-17 04:20	6.4	0.0514108	0.0512228	0.0000627

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
312.98240547	102.04734186	0.01502437	MINIMUM
47.35381422	247.73106099	0.01711857	MINIMUM
0.22742623	174.96577470	0.23299371	SADDLE
180.07790401	354.77995542	1.18037403	SADDLE
0.19954393	354.92195756	1.76697179	SADDLE
180.07353062	174.77861514	3.18030964	MAXIMUM

Download:

MOID Plots

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