Asteroids

451370 2011AK5 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.914

Aphelion (Q)

1.462

Eccentricity (e)

0.231

Inclination (i)

5.5

deg

Orbit period (P)

472.9

Earth MOID

0.03824

U parameter

0.0

Next Earth close approach

Date

2028-04-27

Nominal distance (from Earth center)

0.10532

15755171

Maximum Brightness

19.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.5

mag

Diameter

130 - 300*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-01-08

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

1.187866

1-sigma variation

2.833E-9

Unit

Eccentricity (e)

Value

0.230874

1-sigma variation

3.461E-8

Unit

Inclination (i)

Value

5.5228

1-sigma variation

5.557E-6

Unit

Long. of Ascending Node (Ω)

Value

316.7659

1-sigma variation

3.432E-5

Unit

Arg. of Perihelion (ω)

Value

325.7372

1-sigma variation

3.742E-5

Unit

Mean Anomaly (M)

Value

2.37731

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.913619

1-sigma variation

Unit

Aphelion distance

Value

1.462113

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.070456

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.402990

1-sigma variation

Unit

MOID

Value

0.038237

1-sigma variation

Unit

Orbit Period

Value

472.8785

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.02778E-18	2.88683E-18	-9.79894E-16	-1.17659E-15	1.64220E-14	-4.33684E-14
e	2.88683E-18	1.19800E-15	-3.58560E-14	4.22366E-14	3.65208E-13	-5.36898E-13
i	-9.79894E-16	-3.58560E-14	3.08811E-11	6.37061E-11	-8.20487E-11	2.49682E-11
Ω	-1.17659E-15	4.22366E-14	6.37061E-11	1.17818E-9	-1.17481E-9	7.06915E-12
ω	1.64220E-14	3.65208E-13	-8.20487E-11	-1.17481E-9	1.39998E-9	-3.18772E-10
M	-4.33684E-14	-5.36898E-13	2.49682E-11	7.06915E-12	-3.18772E-10	5.07235E-10

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

[1]

Taxonomy (all)

Value

Unit

Source

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

21.49

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

130 - 300*

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

Radar R

Unit

Source

[4]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Ieva, S. et al. (2018) Astron. Astrophys. 615, A127. (Photometric survey of 67 near-Earth objects)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude
[4]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

4782

Unit

Source

[1]

Unobserved

Value

625

Unit

Source

[1]

Normalized RMS of residuals

Value

0.605571

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-01-08.2952

Unit

Source

[2]

Last Observation

Value

2024-02-11.51494

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

127 (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

2015-08-02

Unit

Source

[3]

Last Observation

Value

2015-08-11

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

2 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 451370 2011AK5 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	1958-09-05 10:03	< 1 min	0.0559821	0.0559817	0.0000001
EARTH	1971-05-26 05:21	< 1 min	0.1119411	0.1119408	0.0000001
EARTH	1980-09-07 16:02	< 1 min	0.0774589	0.0774574	0.0000005
EARTH	1993-07-02 00:20	< 1 min	0.1171876	0.1171874	0.0000001
EARTH	2006-04-23 06:00	< 1 min	0.1448733	0.1448726	0.0000002
EARTH	2015-08-13 19:56	< 1 min	0.0708845	0.0708844	0.0000000
EARTH	2028-04-27 20:06	< 1 min	0.1053168	0.1053163	0.0000002
EARTH	2037-08-15 22:18	< 1 min	0.0663606	0.0663596	0.0000003
EARTH	2050-04-22 23:38	< 1 min	0.1473404	0.1473389	0.0000005
EARTH	2059-07-09 16:06	< 1 min	0.1141318	0.1141315	0.0000001
EARTH	2068-09-11 23:28	< 1 min	0.1186988	0.1186976	0.0000004
EARTH	2081-05-28 14:06	< 1 min	0.1126179	0.1126176	0.0000001
EARTH	2090-09-04 05:53	< 1 min	0.0472547	0.0472539	0.0000002
EARTH	2103-06-05 19:37	< 1 min	0.1152087	0.1152081	0.0000002
EARTH	2112-09-13 07:45	< 1 min	0.1215777	0.1215730	0.0000016
EARTH	2125-07-19 06:06	< 1 min	0.1066668	0.1066656	0.0000004

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
44.35036496	235.51058041	0.03761126	MINIMUM
311.12577138	119.65003070	0.09690353	MINIMUM
349.03152816	166.30386612	0.11935160	SADDLE
177.87204602	358.72350485	0.48303176	SADDLE
359.47424070	359.72003187	1.89662400	SADDLE
180.39348233	180.69146285	2.47750602	MAXIMUM

Download:

MOID Plots

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