Asteroids

2608 Seneca help

Last update: 2025-04-02 02:31 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Amor

Perihelion (q)

1.102

Aphelion (Q)

3.960

Eccentricity (e)

0.565

Inclination (i)

14.4

deg

Orbit period (P)

1470.5

Earth MOID

0.15395

U parameter

1.2

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

17.6

mag

Diameter

900

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1978-02-17

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.530774

1-sigma variation

2.380E-8

Unit

Eccentricity (e)

Value

0.564721

1-sigma variation

1.065E-7

Unit

Inclination (i)

Value

14.4270

1-sigma variation

1.736E-5

Unit

Long. of Ascending Node (Ω)

Value

166.4282

1-sigma variation

3.275E-5

Unit

Arg. of Perihelion (ω)

Value

38.6936

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

321.76074

1-sigma variation

0.00019

Unit

Perihelion distance

Value

1.101594

1-sigma variation

Unit

Aphelion distance

Value

3.959955

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.203762

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.075093

1-sigma variation

Unit

MOID

Value

0.153948

1-sigma variation

Unit

Orbit Period

Value

1470.5458

1-sigma variation

Unit

U parameter

Value

1.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.66439E-16	1.52746E-15	-1.87091E-13	1.63702E-13	-2.84894E-13	-1.35509E-13
e	1.52746E-15	1.13417E-14	1.48914E-13	-2.94745E-13	3.30540E-14	-3.71222E-13
i	-1.87091E-13	1.48914E-13	3.01539E-10	-4.28291E-11	8.18476E-10	-1.43707E-9
Ω	1.63702E-13	-2.94745E-13	-4.28291E-11	1.07271E-9	-1.97950E-9	1.73486E-9
ω	-2.84894E-13	3.30540E-14	8.18476E-10	-1.97950E-9	1.27566E-8	-2.01562E-8
M	-1.35509E-13	-3.71222E-13	-1.43707E-9	1.73486E-9	-2.01562E-8	3.48265E-8

Date of computation: 2025-03-28 15:40 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

[2]

Quality

Value

Unit

Source

[2]

Amplitude

Value

0.5

Unit

mag

Source

[2]

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

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.557

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.16

Unit

Source

[4]

Diameter

Value

900

Unit

Source

[4]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.41

0.83

Unit

U-B

B-V

Source

[5]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	EARN	1.) Tholen, D.J. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1139-1150.
[2]	EARN	1.) Schuster, H.-E. et al. (1979) Astron. & Astrophys. Suppl. 37, 483-486. (Photoelectric observations of two unusual asteroids - 1978 CA and 1978 DA) 2.) Degewij, J. (1978) Messenger 13, 5. (The sizes of 1978 CA and 1978 DA)
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	EARN	1.) Lebofsky, L.A. et al. (1979) Astron. J. 84, 885-888. (Radiometry and surface properties of Apollo, Amor, and Aten asteroids) 1978CA, 1978DA, and 1978RA.
[5]	EARN	1.) Schuster, H.-E. et al. (1979) Astron. & Astrophys. Suppl. 37, 483-486. (Photoelectric observations of two unusual asteroids - 1978 CA and 1978 DA)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

16284

Unit

Source

[1]

Unobserved

Value

927

Unit

Source

[1]

Normalized RMS of residuals

Value

0.684595

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1978-02-17.25794

Unit

Source

[2]

Last Observation

Value

2022-09-18.387678

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

85 (2)

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 2608 Seneca 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	1978-03-15 10:10	< 1 min	0.0900398	0.0900381	0.0000006

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
349.24455495	81.28123655	0.15394768	MINIMUM
2.44211341	285.77761214	2.09047858	SADDLE
181.18975456	282.85231728	2.98004181	SADDLE
179.81426729	102.13412169	4.95346063	MAXIMUM

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MOID Plots

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