Asteroids

3288 Seleucus help

Last update: 2026-09-22 13:00 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Amor

Perihelion (q)

1.109

Aphelion (Q)

2.959

Eccentricity (e)

0.455

Inclination (i)

5.9

deg

Orbit period (P)

1059.8

Earth MOID

0.10685

U parameter

0.0

Next Earth close approach

Date

2101-04-13

Nominal distance (from Earth center)

0.15762

23580063

Maximum Brightness

13.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

15.3

mag

Diameter

3400 | 1400 | 1400

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1982-02-28

Observatory

European Southern Observatory, La Silla

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

2.034263

1-sigma variation

2.461E-9

Unit

Eccentricity (e)

Value

0.454657

1-sigma variation

2.217E-8

Unit

Inclination (i)

Value

5.9265

1-sigma variation

2.622E-6

Unit

Long. of Ascending Node (Ω)

Value

218.5675

1-sigma variation

2.413E-5

Unit

Arg. of Perihelion (ω)

Value

349.4058

1-sigma variation

2.432E-5

Unit

Mean Anomaly (M)

Value

152.74370

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.109370

1-sigma variation

Unit

Aphelion distance

Value

2.959155

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.109570

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.925294

1-sigma variation

Unit

MOID

Value

0.106848

1-sigma variation

Unit

Orbit Period

Value

1059.7634

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.05430E-18	1.02380E-17	-1.60521E-16	1.74598E-15	4.81467E-15	-1.45719E-14
e	1.02380E-17	4.91502E-16	-6.18083E-17	-1.23767E-15	6.33410E-15	-3.35685E-14
i	-1.60521E-16	-6.18083E-17	6.87465E-12	-8.87550E-12	8.29568E-12	8.92158E-13
Ω	1.74598E-15	-1.23767E-15	-8.87550E-12	5.82338E-10	-5.77419E-10	-4.03854E-12
ω	4.81467E-15	6.33410E-15	8.29568E-12	-5.77419E-10	5.91443E-10	-2.24645E-11
M	-1.45719E-14	-3.35685E-14	8.92158E-13	-4.03854E-12	-2.24645E-11	4.96204E-11

Date of computation: 2026-09-22 13:00 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

[5]

Quality

Value

3,T

Unit

Source

[5]

Amplitude

Value

1.0

Unit

mag

Source

[5]

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

S;K

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

15.34

15.323

Unit

mag

Source

[6]

[7]

Slope Parameter (G)

Value

0.25

0.15**

Unit

Source

[6]

[7]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.27

Unit

Source

[8]

Diameter

Value

3400 | 1400 | 1400

Unit

Source

[8]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.4331
0.5
0.481
-0.1
0.0581
0.5762
0.1537
0.82

Unit

g-r

U-B

g-z

i-z

r-z

g-i

r-i

B-V

Source

[2]

[9]

[2]

[9]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Unit

Source

[10]

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Sources

No.	Name	Additional
[1]	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)
[2]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[3]	EARN	1.) Vilas, F. et al. (1985) Icarus 63, 201-205. (Physical parameters of near-earth asteroid 1982 DV) 2.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.) 3.) 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	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Debehogne, H. et al. (1983) Icarus 55, 236-244. (Photoelectric photometry of asteroids 45, 120, 776, 804, 814, and 1982DV) 2.) Harris, A.W. (DLR) (1998) Icarus 131, 291-301. (A Thermal Model for Near-Earth Asteroids) 3.) Harris(JPL), A.W. et al. (1999) Icarus 142,173-201. (Asteroid lightcurve observations from 1981-1983)
[6]	EARN	1.) Tedesco, E.F. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1090-1138.
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	EARN	1.) Vilas, F. et al. (1985) Icarus 63, 201-205. (Physical parameters of near-earth asteroid 1982 DV) 2.) Veeder, G.J. et al. (1989) Astron. J. 97, 1211-1219. (Radiometry of near-earth asteroids) 3.) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs) 4.) Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; et al. (2012) Astrophys. J. Let. 760, L12.
[9]	EARN	1.) Harris, A.W. & J.W. Young (1983) Icarus 54, 59-109. (Asteroid rotation. IV)
[10]	EARN	1.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

16276

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.469316

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1982-02-28.21676

Unit

Source

[2]

Last Observation

Value

2026-09-21.396715

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

2654 (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

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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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.

Close Approaches for 3288 Seleucus 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	1982-04-12 17:43	< 1 min	0.1396768	0.1396763	0.0000002
EARTH	2101-04-13 16:51	< 1 min	0.1576230	0.1576220	0.0000003

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
2.72612316	108.72346779	0.10684839	MINIMUM
180.46593017	285.65096196	1.96459068	SADDLE
1.44003577	286.63270792	2.10399425	SADDLE
180.63083152	105.75382262	3.96225856	MAXIMUM

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MOID Plots

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