Asteroids

2017KY4 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

1.003

Aphelion (Q)

1.145

Eccentricity (e)

0.066

Inclination (i)

17.5

deg

Orbit period (P)

406.4

Earth MOID

0.00502

U parameter

6.5

Next Earth close approach

Date

2027-05-24

Nominal distance (from Earth center)

0.0836

12506837

Maximum Brightness

22.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.7

mag

Diameter

30 - 70*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-05-22

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

1.073798

1-sigma variation

0.000075

Unit

Eccentricity (e)

Value

0.066325

1-sigma variation

0.000062

Unit

Inclination (i)

Value

17.5250

1-sigma variation

0.0066

Unit

Long. of Ascending Node (Ω)

Value

239.3519

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

41.7895

1-sigma variation

0.0205

Unit

Mean Anomaly (M)

Value

195.08391

1-sigma variation

0.26456

Unit

Perihelion distance

Value

1.002578

1-sigma variation

Unit

Aphelion distance

Value

1.145018

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.005100

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.136854

1-sigma variation

Unit

MOID

Value

0.005015

1-sigma variation

Unit

Orbit Period

Value

406.4269

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.58992E-9	4.65597E-9	4.93940E-7	6.28628E-9	-1.52844E-6	-1.97798E-5
e	4.65597E-9	3.87829E-9	4.11425E-7	5.23305E-9	-1.27277E-6	-1.64753E-5
i	4.93940E-7	4.11425E-7	4.36531E-5	5.55565E-7	-1.35040E-4	-1.74781E-3
Ω	6.28628E-9	5.23305E-9	5.55565E-7	7.14036E-9	-1.72273E-6	-2.22406E-5
ω	-1.52844E-6	-1.27277E-6	-1.35040E-4	-1.72273E-6	4.18316E-4	5.40802E-3
M	-1.97798E-5	-1.64753E-5	-1.74781E-3	-2.22406E-5	5.40802E-3	6.99905E-2

Date of computation: 2025-09-10 00:30 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

24.74

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

30 - 70*

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

Unit

Source

[1]

Unobserved

Value

3043

Unit

Source

[1]

Normalized RMS of residuals

Value

0.633492

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-05-21.34699

Unit

Source

[2]

Last Observation

Value

2017-05-28.30619

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

124 (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 2017KY4 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	1950-05-26 19:59	> 1 w	0.1306879	0.0009353	0.4883827
EARTH	1959-05-14 17:33	> 1 w	0.1481998	0.0010846	0.3695631
EARTH	1959-11-19 06:31	> 1 mo	0.1450286	0.1436155	0.0448371
EARTH	1978-05-20 10:49	1037.6	0.0121990	0.0060849	0.0142116
EARTH	1978-11-11 06:19	> 1 d	0.1549218	0.1431838	0.0060887
EARTH	1988-05-27 08:20	798.0	0.1557653	0.1093007	0.0154882
EARTH	2007-05-14 02:13	308.9	0.1687020	0.1494341	0.0064227
EARTH	2007-11-21 23:13	845.7	0.1457866	0.1414919	0.0017435
EARTH	2017-05-20 15:49	< 1 s	0.0063368	0.0063294	0.0000025
EARTH	2017-11-11 13:20	25.9	0.1495926	0.1490430	0.0001833
EARTH	2027-05-24 19:33	382.5	0.0836030	0.0642694	0.0064475
EARTH	2027-11-06 22:48	514.9	0.1914984	0.1806097	0.0038258
EARTH	2056-05-12 16:48	498.8	0.1872202	0.1545018	0.0109061
EARTH	2056-11-23 14:23	> 1 d	0.1553854	0.1457568	0.0040554
EARTH	2066-05-18 09:41	557.4	0.0618308	0.0334314	0.0095005
EARTH	2066-11-15 17:45	1019.6	0.1343815	0.1339419	0.0006753
EARTH	2076-05-20 13:28	58.7	0.0069065	0.0067334	0.0002059
EARTH	2076-11-11 10:13	750.4	0.1482136	0.1391533	0.0031631
EARTH	2086-05-29 09:19	> 1 d	0.1901968	0.0025079	0.0785040
EARTH	2105-05-17 07:11	> 1 d	0.1073601	0.0044568	0.1845451
EARTH	2105-11-19 17:50	> 1 w	0.1368119	0.1351478	0.0265938
EARTH	2115-05-24 18:08	> 1 w	0.0585915	0.0059736	0.1742646
EARTH	2115-11-09 18:29	> 1 w	0.1732269	0.1487279	0.0828812

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
320.92749097	136.70143286	0.00667757	MINIMUM
130.27466010	312.84622944	0.13403326	MINIMUM
46.92951599	229.46222460	0.31028808	SADDLE
225.10302658	40.50627922	0.34726553	SADDLE
15.07647205	13.96918587	1.97256586	SADDLE
166.90288800	165.67775464	2.15304959	MAXIMUM

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MOID Plots

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