Asteroids

5786 Talos help

Last update: 2026-08-15 13:16 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.187

Aphelion (Q)

1.976

Eccentricity (e)

0.827

Inclination (i)

23.2

deg

Orbit period (P)

410.8

Earth MOID

0.18867

U parameter

0.0

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.2

mag

Diameter

890

Taxonomic type

Scomp

Rotation period (T)

23.60

Discovery Information

Discovery Date

1991-09-03

Observatory

Siding Spring Observatory

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

1.081560

1-sigma variation

1.374E-9

Unit

Eccentricity (e)

Value

0.826845

1-sigma variation

2.349E-8

Unit

Inclination (i)

Value

23.2238

1-sigma variation

5.568E-6

Unit

Long. of Ascending Node (Ω)

Value

161.2802

1-sigma variation

5.098E-6

Unit

Arg. of Perihelion (ω)

Value

8.3871

1-sigma variation

6.038E-6

Unit

Mean Anomaly (M)

Value

83.34458

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.187277

1-sigma variation

Unit

Aphelion distance

Value

1.975843

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.802684

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.870814

1-sigma variation

Unit

MOID

Value

0.188671

1-sigma variation

Unit

Orbit Period

Value

410.8416

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.88682E-18	-9.39359E-18	4.50513E-16	2.05301E-16	2.81156E-16	-8.51349E-15
e	-9.39359E-18	5.51959E-16	1.27940E-14	9.32667E-15	-1.90557E-14	5.00681E-14
i	4.50513E-16	1.27940E-14	3.10015E-11	7.91012E-12	-8.54223E-12	3.03964E-12
Ω	2.05301E-16	9.32667E-15	7.91012E-12	2.59913E-11	-2.73456E-11	1.06131E-11
ω	2.81156E-16	-1.90557E-14	-8.54223E-12	-2.73456E-11	3.64529E-11	-2.72353E-11
M	-8.51349E-15	5.00681E-14	3.03964E-12	1.06131E-11	-2.72353E-11	8.67943E-11

Date of computation: 2026-08-15 13:16 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

38.52

23.60

Unit

Source

[4]

[1]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.3

0.23

Unit

mag

Source

[1]

[4]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

339

Unit

Source

[1]

Spinvector B

Value

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Scomp

Unit

Source

[2]

Taxonomy (all)

Value

Unit

Source

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.36

17.192

Unit

mag

Source

[5]

[6]

Slope Parameter (G)

Value

0.15**

0.24

Unit

Source

[6]

[7]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.36

Unit

Source

[8]

Diameter

Value

890

Unit

Source

[8]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.81

0.52

Unit

B-V

V-R

Source

[9]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Unit

Source

[10]

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Sources

No.	Name	Additional
[1]	EARN	1.) Near-Earth Asteroid Lightcurve Analysis at the Center for Solar System Studies: 2019 July-September, B.D. Warner
[2]	EARN	1.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[3]	EARN	1.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects) 2.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[4]	EARN	1.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[5]	EARN	1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations) 2.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)
[8]	EARN	1.) Campins, H. et al. (2009) Earth Moon and Planets 105, 159-165. (Low perihelion near-Earth asteroids)
[9]	EARN	1.) Dandy, C.L.; Fitzsimmons, A.; Collander-Brown, S.J. (2003) Icarus 163, 363-373. (Optical colors of 56 near-Earth objects: trends with size and orbit)
[10]	EARN	1.) Lazzarin, M. et al. (1997) Astron. & Astrophys. 327, 388-391. (Compositional properties of Near-Earth Asteroids: spectroscopic comparison with Ordinary Chondrite Meteorites) 2.) Lazzarin, M. et al. (1997) B.A.A.S. 29, 966. (Spectroscopic Comparison Between Near-Earth Asteroids and Ordinary Chondrites Meteorites) 3.) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.) 4.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

12764

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.486126

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1991-09-03.59023

Unit

Source

[2]

Last Observation

Value

2026-08-15.0466

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1518 (10)

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

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Final Date: *

Normalised Only accepted

Max residual (arcsec):

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Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

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Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
87.46588474	212.00699608	0.18867067	MINIMUM
274.45567871	280.62332135	0.28427406	MINIMUM
6.65678014	79.66653816	0.80908116	SADDLE
181.22446203	245.37967012	0.97227359	SADDLE
5.17831214	255.23041340	1.19226556	SADDLE
179.98002595	65.01877781	2.96771787	MAXIMUM

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MOID Plots

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