Asteroids

2007KE4 help

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

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

1.000

Aphelion (Q)

3.758

Eccentricity (e)

0.580

Inclination (i)

9.3

deg

Orbit period (P)

1340.1

Earth MOID

0.00043

U parameter

8.9

Next Earth close approach

Date

2099-05-02

Nominal distance (from Earth center)

0.18202

27230191

Maximum Brightness

24.1

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

25.3

mag

Diameter

24 - 50*

Taxonomic type

Rotation period (T)

0.02141

Discovery Information

Discovery Date

2007-05-24

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.378784

1-sigma variation

0.008817

Unit

Eccentricity (e)

Value

0.579682

1-sigma variation

0.001819

Unit

Inclination (i)

Value

9.3136

1-sigma variation

0.0095

Unit

Long. of Ascending Node (Ω)

Value

64.7289

1-sigma variation

0.0269

Unit

Arg. of Perihelion (ω)

Value

195.4648

1-sigma variation

0.0894

Unit

Mean Anomaly (M)

Value

308.61314

1-sigma variation

11.32700

Unit

Perihelion distance

Value

0.999845

1-sigma variation

Unit

Aphelion distance

Value

3.757723

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.591594

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.000520

1-sigma variation

Unit

MOID

Value

0.000431

1-sigma variation

Unit

Orbit Period

Value

1340.0803

1-sigma variation

Unit

U parameter

Value

8.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.77380E-5	1.60339E-5	8.40398E-5	-2.36812E-4	7.87660E-4	-9.98691E-2
e	1.60339E-5	3.30708E-6	1.73337E-5	-4.88438E-5	1.62464E-4	-2.05985E-2
i	8.40398E-5	1.73337E-5	9.08598E-5	-2.56010E-4	8.51528E-4	-1.07965E-1
Ω	-2.36812E-4	-4.88438E-5	-2.56010E-4	7.21397E-4	-2.39945E-3	3.04230E-1
ω	7.87660E-4	1.62464E-4	8.51528E-4	-2.39945E-3	7.98482E-3	-1.01190E0
M	-9.98691E-2	-2.05985E-2	-1.07965E-1	3.04230E-1	-1.01190E0	1.28301E2

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

0.02141

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.4

Unit

mag

Source

[1]

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

25.255

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

24 - 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

[-]

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Sources

No.	Name	Additional
[1]	EARN	1.) Kwiatkowski, T. et al. (2010) Astron. Astrophys. 509, A94. (Photometric survey of the very small near-Earth asteroids with the SALT telescope I. Lightcurves and periods for 14 objects) (K06XY,K06YH14,K07DD,K07DX,K07HD84,K07KE,K07KE4, K07LT,K07LW19,K07RS146,K07TU18,K07VV83,K07XO3,K08DG4)
[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

6657

Unit

Source

[1]

Normalized RMS of residuals

Value

0.456152

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2007-05-24.32711

Unit

Source

[2]

Last Observation

Value

2007-05-26.3866

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

33 (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

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 2007KE4 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	2007-05-27 23:08	< 1 min	0.0181298	0.0179856	0.0000481
EARTH	2099-05-02 09:42	> 1 mo	0.1820226	0.0223739	1.7145913
EARTH	2110-06-02 06:59	> 1 mo	0.0235091	0.0195623	0.3002069

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
352.01909412	141.98179037	0.00043076	MINIMUM
0.75424170	338.88035421	1.98411685	SADDLE
180.32225669	338.02332858	2.77415851	SADDLE
180.01658301	157.87089986	4.77205549	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2007KE4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2026-05-25.987	61185.987	4.271	1.46 ± 0.080	8.23E3	2.72E-9	1.19E0	-7.09
2029-05-26.013	62282.013	-0.965	0.98 ± 0.035	1.74E4	4.27E-5	1.05E0	-3.47
2091-05-26.021	84927.021	-0.822	0.21 ± 0.004	8.58E5	9.78E-7	1.06E0	-6.28
2115-05-26.632	93692.632	1.826	0.71 ± 0.000	4.37E6	4.79E-8	1.13E0	-7.70


Based on 33 optical observations (of which 0 are rejected as outliers) from 2007/05/24.327 to 2007/05/26.387.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.48 and 1.48 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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