Asteroids

2009FX4 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.873

Aphelion (Q)

1.701

Eccentricity (e)

0.321

Inclination (i)

0.5

deg

Orbit period (P)

533.3

Earth MOID

0.00643

U parameter

8.7

Next Earth close approach

Date

2041-07-08

Nominal distance (from Earth center)

0.1014

15168983

Maximum Brightness

27.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

20 - 50*

Taxonomic type

Rotation period (T)

0.2000

Discovery Information

Discovery Date

2009-03-19

Observatory

Catalina Sky 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.287019

1-sigma variation

0.002898

Unit

Eccentricity (e)

Value

0.321341

1-sigma variation

0.000665

Unit

Inclination (i)

Value

0.5213

1-sigma variation

0.0063

Unit

Long. of Ascending Node (Ω)

Value

50.2651

1-sigma variation

2.0432

Unit

Arg. of Perihelion (ω)

Value

195.0916

1-sigma variation

2.0293

Unit

Mean Anomaly (M)

Value

263.68331

1-sigma variation

0.48867

Unit

Perihelion distance

Value

0.873447

1-sigma variation

Unit

Aphelion distance

Value

1.700590

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.681493

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.128422

1-sigma variation

Unit

MOID

Value

0.006433

1-sigma variation

Unit

Orbit Period

Value

533.3052

1-sigma variation

Unit

U parameter

Value

8.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.40014E-6	1.92690E-6	1.81190E-5	-5.92183E-3	5.88146E-3	1.41632E-3
e	1.92690E-6	4.42039E-7	4.15664E-6	-1.35845E-3	1.34919E-3	3.24882E-4
i	1.81190E-5	4.15664E-6	3.90877E-5	-1.27740E-2	1.26870E-2	3.05491E-3
Ω	-5.92183E-3	-1.35845E-3	-1.27740E-2	4.17479E0	-4.14634E0	-9.98452E-1
ω	5.88146E-3	1.34919E-3	1.26870E-2	-4.14634E0	4.11808E0	9.91643E-1
M	1.41632E-3	3.24882E-4	3.05491E-3	-9.98452E-1	9.91643E-1	2.38803E-1

Date of computation: 2026-03-17 23:26 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

0.2000

Unit

Source

[1]

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

25.599

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

20 - 50*

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.) Ryan, W. UNPUBLISHED
[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

Unit

Source

[1]

Unobserved

Value

6218

Unit

Source

[1]

Normalized RMS of residuals

Value

0.68325

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-03-19.30767

Unit

Source

[2]

Last Observation

Value

2009-03-22.42213

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

51 (1)

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

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 2009FX4 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
MARS	1959-02-07 03:05	> 1 d	0.0287621	0.0281926	0.0019862
EARTH	1965-08-06 18:51	> 1 d	0.0555579	0.0084457	0.0599923
EARTH	1968-04-18 06:44	> 1 w	0.0996801	0.0089643	0.0401068
MARS	1972-04-09 04:12	> 1 d	0.0288280	0.0282643	0.0078935
MARS	1985-06-07 10:59	> 1 d	0.0385289	0.0283444	0.0264457
EARTH	1987-06-10 07:56	> 1 w	0.1355762	0.1063521	0.0098320
EARTH	1990-03-14 06:56	> 1 d	0.1480897	0.0068541	0.0548730
EARTH	2006-07-24 16:04	> 1 d	0.0544301	0.0213204	0.0112748
EARTH	2009-03-23 14:34	< 1 min	0.0157582	0.0157049	0.0000178
MARS	2011-10-07 11:15	153.4	0.0277482	0.0272844	0.0014555
EARTH	2022-08-07 13:02	> 1 d	0.0489360	0.0090559	0.0567309
EARTH	2025-03-29 20:58	> 1 d	0.0340429	0.0063453	0.0338692
EARTH	2041-07-08 11:31	> 1 mo	0.1013984	0.0115777	0.1796434
EARTH	2044-03-16 15:43	> 1 w	0.1068953	0.0065921	0.3233116
EARTH	2057-08-14 19:16	> 1 w	0.1601266	0.0091592	0.2314399
EARTH	2060-05-05 17:12	> 1 mo	0.1263453	0.0182020	0.0669356
EARTH	2076-07-29 17:33	> 1 d	0.0308952	0.0089199	0.0276168
EARTH	2079-03-21 00:13	> 1 d	0.0546081	0.0062586	0.0407030
MARS	2088-06-13 06:36	190.3	0.0374357	0.0328406	0.0015941
EARTH	2092-07-28 17:17	> 1 d	0.0392079	0.0095130	0.0149045
EARTH	2095-03-16 08:04	> 1 d	0.1199739	0.0675557	0.0174922
EARTH	2108-05-24 08:29	> 1 d	0.1407230	0.1379537	0.0009280
EARTH	2121-08-11 14:45	346.0	0.0837207	0.0730631	0.0035538
EARTH	2124-03-27 14:15	101.5	0.0129406	0.0119770	0.0003257

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
314.23552368	82.07569682	0.00651416	MINIMUM
49.06364460	209.52669087	0.00914264	MINIMUM
1.92295125	146.09759918	0.14183640	SADDLE
180.97467606	325.08453554	0.71392428	SADDLE
1.84611199	326.00710234	1.85980554	SADDLE
180.99541685	145.10866509	2.71552894	MAXIMUM

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MOID Plots

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