Asteroids

2011OK5 help

Last update: 2025-06-12 08:28 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Amor

Perihelion (q)

1.117

Aphelion (Q)

1.540

Eccentricity (e)

0.159

Inclination (i)

12.8

deg

Orbit period (P)

559.3

Earth MOID

0.13348

U parameter

0.6

Next Earth close approach

Date

2026-01-21

Nominal distance (from Earth center)

0.14168

21194944

Maximum Brightness

18.2

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

21.2

mag

Diameter

150 - 300*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-07-25

Observatory

Pan-STARRS 1, Haleakala

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

1.328509

1-sigma variation

1.351E-8

Unit

Eccentricity (e)

Value

0.159112

1-sigma variation

3.417E-7

Unit

Inclination (i)

Value

12.8346

1-sigma variation

2.033E-5

Unit

Long. of Ascending Node (Ω)

Value

305.0590

1-sigma variation

2.707E-5

Unit

Arg. of Perihelion (ω)

Value

172.1359

1-sigma variation

4.342E-5

Unit

Mean Anomaly (M)

Value

192.71372

1-sigma variation

0.00008

Unit

Perihelion distance

Value

1.117128

1-sigma variation

Unit

Aphelion distance

Value

1.539890

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.522158

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.133698

1-sigma variation

Unit

MOID

Value

0.133485

1-sigma variation

Unit

Orbit Period

Value

559.3006

1-sigma variation

Unit

U parameter

Value

0.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.82546E-16	4.16224E-15	7.68184E-14	3.88796E-14	1.91985E-13	-8.92665E-13
e	4.16224E-15	1.16776E-13	2.13022E-12	1.14282E-12	4.02986E-12	-2.02004E-11
i	7.68184E-14	2.13022E-12	4.13502E-10	-2.58288E-10	3.28214E-10	-3.39266E-10
Ω	3.88796E-14	1.14282E-12	-2.58288E-10	7.32524E-10	-6.92428E-10	-1.56740E-10
ω	1.91985E-13	4.02986E-12	3.28214E-10	-6.92428E-10	1.88527E-9	-2.17847E-9
M	-8.92665E-13	-2.02004E-11	-3.39266E-10	-1.56740E-10	-2.17847E-9	5.95698E-9

Date of computation: 2025-06-12 08:28 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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

21.235

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

150 - 300*

Unit

Source

[4]

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.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

7304

Unit

Source

[1]

Unobserved

Value

880

Unit

Source

[1]

Normalized RMS of residuals

Value

0.463168

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2003-01-29.29753

Unit

Source

[2]

Last Observation

Value

2023-01-28.453926

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

49 (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 2011OK5 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	1977-01-22 21:52	< 1 min	0.1342038	0.1342019	0.0000006
EARTH	2026-01-21 02:04	< 1 min	0.1416795	0.1416787	0.0000003
EARTH	2049-01-30 02:43	< 1 min	0.1660518	0.1660440	0.0000026
EARTH	2075-01-18 17:17	< 1 min	0.1622668	0.1622572	0.0000032
EARTH	2098-01-27 16:01	1.2	0.1447377	0.1447277	0.0000033
EARTH	2124-01-16 12:02	1.4	0.1966599	0.1966367	0.0000077

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
5.36901637	21.00284546	0.13348477	MINIMUM
172.31689393	188.85307322	0.52645252	SADDLE
0.26031104	195.22685025	2.13261897	SADDLE
181.80081198	16.82188947	2.52392811	MAXIMUM

Download:

MOID Plots

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