Asteroids

5731 Zeus help

Last update: 2025-10-24 16:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.787

Aphelion (Q)

3.743

Eccentricity (e)

0.652

Inclination (i)

11.2

deg

Orbit period (P)

1245.4

Earth MOID

0.06472

U parameter

0.0

Next Earth close approach

Date

2029-12-08

Nominal distance (from Earth center)

0.09884

14786134

Maximum Brightness

13.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

15.6

mag

Diameter

2100 - 5000*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1988-11-04

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.265401

1-sigma variation

3.607E-9

Unit

Eccentricity (e)

Value

0.652409

1-sigma variation

2.530E-8

Unit

Inclination (i)

Value

11.2008

1-sigma variation

2.864E-6

Unit

Long. of Ascending Node (Ω)

Value

280.5881

1-sigma variation

2.176E-5

Unit

Arg. of Perihelion (ω)

Value

218.4440

1-sigma variation

2.181E-5

Unit

Mean Anomaly (M)

Value

281.86693

1-sigma variation

2.703E-6

Unit

Perihelion distance

Value

0.787432

1-sigma variation

Unit

Aphelion distance

Value

3.743369

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.643168

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.122469

1-sigma variation

Unit

MOID

Value

0.064722

1-sigma variation

Unit

Orbit Period

Value

1245.4203

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.30082E-17	-1.46069E-17	8.97175E-16	1.40641E-15	-7.16941E-15	-4.35876E-15
e	-1.46069E-17	6.40260E-16	-6.38585E-15	-5.95459E-14	1.01511E-13	-1.33199E-14
i	8.97175E-16	-6.38585E-15	8.20413E-12	9.51216E-12	-9.54318E-12	-7.69595E-13
Ω	1.40641E-15	-5.95459E-14	9.51216E-12	4.73376E-10	-4.68048E-10	-4.57546E-13
ω	-7.16941E-15	1.01511E-13	-9.54318E-12	-4.68048E-10	4.75707E-10	-3.65267E-12
M	-4.35876E-15	-1.33199E-14	-7.69595E-13	-4.57546E-13	-3.65267E-12	7.30624E-12

Date of computation: 2025-10-24 16:00 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

15.555

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

2100 - 5000*

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

13554

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.42561

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1988-09-13.4493

Unit

Source

[2]

Last Observation

Value

2025-10-23.307642

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1490 (7)

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 5731 Zeus 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	1954-12-23 13:54	< 1 min	0.0988579	0.0988557	0.0000007
EARTH	2029-12-08 14:38	< 1 min	0.0988392	0.0988387	0.0000002
EARTH	2047-01-14 11:11	< 1 min	0.1702604	0.1702598	0.0000002
EARTH	2064-04-13 21:43	< 1 min	0.1886707	0.1886704	0.0000001

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
332.45289905	342.11496264	0.06472151	MINIMUM
31.16618001	99.54316064	0.19200628	MINIMUM
7.99629050	53.53989983	0.23719149	SADDLE
1.66347266	219.97425809	1.79825913	SADDLE
180.64526090	217.64689339	2.73904937	SADDLE
179.92502891	37.31232752	4.72467759	MAXIMUM

Download:

MOID Plots

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