Asteroids

5381 Sekhmet help

Last update: 2026-06-05 13:30 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.667

Aphelion (Q)

1.228

Eccentricity (e)

0.296

Inclination (i)

49.0

deg

Orbit period (P)

336.9

Earth MOID

0.11267

U parameter

0.0

Next Earth close approach

Date

2038-05-20

Nominal distance (from Earth center)

0.19857

29706061

Maximum Brightness

15.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.8

mag

Diameter

1410

Taxonomic type

Rotation period (T)

2.823

Discovery Information

Discovery Date

1991-05-14

Observatory

Palomar Mountain

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

0.947488

1-sigma variation

6.909E-10

Unit

Eccentricity (e)

Value

0.296404

1-sigma variation

1.808E-7

Unit

Inclination (i)

Value

48.9656

1-sigma variation

1.555E-5

Unit

Long. of Ascending Node (Ω)

Value

58.5285

1-sigma variation

3.522E-6

Unit

Arg. of Perihelion (ω)

Value

37.4396

1-sigma variation

1.350E-5

Unit

Mean Anomaly (M)

Value

120.36127

1-sigma variation

0.00003

Unit

Perihelion distance

Value

0.666649

1-sigma variation

Unit

Aphelion distance

Value

1.228327

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.288816

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.118581

1-sigma variation

Unit

MOID

Value

0.112674

1-sigma variation

Unit

Orbit Period

Value

336.8674

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.77387E-19	4.21423E-19	1.93426E-15	-9.46354E-16	-4.47961E-15	2.81593E-15
e	4.21423E-19	3.26800E-14	2.59395E-13	-1.86211E-13	1.11710E-12	-5.05435E-12
i	1.93426E-15	2.59395E-13	2.41938E-10	-4.64047E-11	3.58915E-12	-1.27520E-11
Ω	-9.46354E-16	-1.86211E-13	-4.64047E-11	1.24055E-11	4.94929E-12	8.95196E-12
ω	-4.47961E-15	1.11710E-12	3.58915E-12	4.94929E-12	1.82222E-10	-3.06970E-10
M	2.81593E-15	-5.05435E-12	-1.27520E-11	8.95196E-12	-3.06970E-10	9.35854E-10

Date of computation: 2026-06-05 13:30 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

2.823

Unit

Source

[4]

Quality

Value

3,B,R

Unit

Source

[4]

Amplitude

Value

0.1

Unit

mag

Source

[4]

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]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.769

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.3243

Unit

Source

[7]

Diameter

Value

1410

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.5453

Unit

g-r

Source

[1]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Radar R

Unit

Source

[2]

[8]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[3]

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Sources

No.	Name	Additional
[1]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[2]	EARN	1.) Davies, J.K. et al. (2007) Icarus 186,111-125. (Near-infrared spectra of 12 near-Earth objects) (1627,4179, 5381,5587,6489,11405,14402,25143,25330,52760,66391,101955)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Warner, B.D. & A.W. Harris (JPL) (2014) MPB 41, 224-226. (LIGHTCURVE ANALYSIS OF THE NEA BINARY ASTEROID 5381 SEKHMET) 2.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods" 3.) Nolan, M.C. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08100/08163.html"> 8163. (5381 Sekhmet) (radar observation, binary asteroid)
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Delbo, M. et al. (2011) Icarus 212, 138-148. (The cool surfaces of binary near-Earth asteroids) (5381,153591, 164121) 2.) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs) 3.) Masiero, J.R. et al. (2018) Astron. J. 154_168(10pp). (NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos) (170NEOs, 6110MBAs)
[7]	EARN	1.) Masiero, J.R. et al. (2018) Astron. J. 154_168(10pp). (NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos) (170NEOs, 6110MBAs) 2.) Delbo, M. et al. (2011) Icarus 212, 138-148. (The cool surfaces of binary near-Earth asteroids) (5381,153591, 164121) 3.) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs)
[8]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Nolan, M.C. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08100/08163.html"> 8163. (5381 Sekhmet) (radar observation, binary asteroid)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

12806

Unit

Source

[1]

Unobserved

Value

0.9

Unit

Source

[1]

Normalized RMS of residuals

Value

0.488664

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1991-05-14.43646

Unit

Source

[2]

Last Observation

Value

2026-06-05.230078

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1033 (9)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2015-05-03

Unit

Source

[3]

Last Observation

Value

2015-05-03

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

1 (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

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 5381 Sekhmet 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
EARTH	1955-05-20 10:28	< 1 s	0.1850973	0.1850965	0.0000002
EARTH	1967-05-19 12:53	< 1 s	0.1464063	0.1464058	0.0000002
EARTH	1979-05-18 18:56	< 1 s	0.1196600	0.1196598	0.0000001
EARTH	1991-05-18 04:10	< 1 s	0.1127972	0.1127970	0.0000001
EARTH	2003-05-17 16:44	< 1 s	0.1284936	0.1284934	0.0000001
EARTH	2015-05-17 08:33	< 1 s	0.1613288	0.1613286	0.0000000
EARTH	2038-05-20 20:39	< 1 s	0.1985727	0.1985723	0.0000002
EARTH	2050-05-19 23:13	< 1 s	0.1598802	0.1598796	0.0000002
EARTH	2062-05-19 07:34	< 1 s	0.1333619	0.1333614	0.0000002
EARTH	2074-05-18 20:57	< 1 s	0.1187721	0.1187717	0.0000001
EARTH	2086-05-18 13:29	< 1 s	0.1135197	0.1135194	0.0000001
EARTH	2098-05-18 09:11	< 1 s	0.1136194	0.1136192	0.0000001
EARTH	2110-05-19 06:35	< 1 s	0.1156776	0.1156773	0.0000001
EARTH	2122-05-19 05:16	< 1 s	0.1182553	0.1182547	0.0000002

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
127.41083734	131.79890103	0.11267350	MINIMUM
328.63178507	312.29808111	0.28521711	MINIMUM
41.63341128	45.82388888	0.75044286	SADDLE
238.55315443	213.25218143	0.86689680	SADDLE
29.36658400	203.37264053	1.57938487	SADDLE
160.57465198	329.33220399	2.17368246	MAXIMUM

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MOID Plots

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