Asteroids

5786 Talos help

Last update: 2026-09-17 13:16 UTC

Orbital Properties

Epoch

61400.0

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

0.18876

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

61400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.081540

1-sigma variation

1.367E-9

Unit

Eccentricity (e)

Value

0.826882

1-sigma variation

2.349E-8

Unit

Inclination (i)

Value

23.2261

1-sigma variation

5.568E-6

Unit

Long. of Ascending Node (Ω)

Value

161.2812

1-sigma variation

4.951E-6

Unit

Arg. of Perihelion (ω)

Value

8.3874

1-sigma variation

5.848E-6

Unit

Mean Anomaly (M)

Value

258.59135

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.187234

1-sigma variation

Unit

Aphelion distance

Value

1.975846

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.802498

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.872600

1-sigma variation

Unit

MOID

Value

0.188758

1-sigma variation

Unit

Orbit Period

Value

410.8301

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.86976E-18	-9.33677E-18	4.44235E-16	1.79355E-16	3.89115E-16	-9.00115E-15
e	-9.33677E-18	5.51594E-16	1.28194E-14	8.96013E-15	-1.89222E-14	5.22914E-14
i	4.44235E-16	1.28194E-14	3.09992E-11	7.87311E-12	-8.45378E-12	2.90125E-12
Ω	1.79355E-16	8.96013E-15	7.87311E-12	2.45170E-11	-2.56786E-11	9.91085E-12
ω	3.89115E-16	-1.89222E-14	-8.45378E-12	-2.56786E-11	3.42016E-11	-2.64585E-11
M	-9.00115E-15	5.22914E-14	2.90125E-12	9.91085E-12	-2.64585E-11	9.06718E-11

Date of computation: 2026-09-17 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

23.60

38.52

Unit

Source

[1]

[4]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.23

0.3

Unit

mag

Source

[4]

[1]

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

17.193

17.36

Unit

mag

Source

[5]

[6]

Slope Parameter (G)

Value

0.15**

0.24

Unit

Source

[5]

[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

0.52

0.81

Unit

V-R

B-V

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]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	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"
[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

12797

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.486292

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

2026-09-16.227595

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1588 (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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Normalised Only accepted

Max residual (arcsec):

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Computation parameters

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Final Date: *

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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
87.33931319	213.38321549	0.18875773	MINIMUM
274.54051891	282.06691027	0.28415554	MINIMUM
6.44679803	80.70944140	0.80864834	SADDLE
181.20959329	246.80652775	0.97400332	SADDLE
4.99505050	256.34970230	1.19059550	SADDLE
179.96967582	66.44794279	2.96740988	MAXIMUM

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MOID Plots

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