Asteroids

4947 Ninkasi help

Last update: 2025-09-10 09:18 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.139

Aphelion (Q)

1.601

Eccentricity (e)

0.168

Inclination (i)

15.7

deg

Orbit period (P)

585.8

Earth MOID

0.14963

U parameter

0.0

A₂

-28.1

10^-15au/days²

Next Earth close approach

Date

2073-11-04

Nominal distance (from Earth center)

0.18504

27681624

Maximum Brightness

16.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.1

mag

Diameter

600

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1988-10-12

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

1.370113

1-sigma variation

3.912E-9

Unit

Eccentricity (e)

Value

0.168440

1-sigma variation

3.437E-8

Unit

Inclination (i)

Value

15.6518

1-sigma variation

3.727E-6

Unit

Long. of Ascending Node (Ω)

Value

215.4221

1-sigma variation

8.681E-6

Unit

Arg. of Perihelion (ω)

Value

192.9627

1-sigma variation

1.348E-5

Unit

Mean Anomaly (M)

Value

30.35999

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.139331

1-sigma variation

Unit

Aphelion distance

Value

1.600895

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.585009

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.149994

1-sigma variation

Unit

MOID

Value

0.149634

1-sigma variation

Unit

Orbit Period

Value

585.7778

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-28.06067

1-sigma variation

6.40871

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.53053E-17	1.63368E-17	-3.63258E-16	-1.39148E-15	-2.32856E-15	-1.59670E-14	2.38366E-8
e	1.63368E-17	1.18109E-15	5.88470E-15	-9.85251E-15	-1.12537E-13	1.55758E-13	1.98837E-8
i	-3.63258E-16	5.88470E-15	1.38915E-11	2.67565E-12	6.82516E-13	-3.45809E-12	-6.02884E-7
Ω	-1.39148E-15	-9.85251E-15	2.67565E-12	7.53541E-11	-7.29807E-11	3.25971E-12	-1.33801E-6
ω	-2.32856E-15	-1.12537E-13	6.82516E-13	-7.29807E-11	1.81580E-10	-1.30906E-10	-1.11946E-5
M	-1.59670E-14	1.55758E-13	-3.45809E-12	3.25971E-12	-1.30906E-10	1.83545E-10	-1.42795E-5
A₂	2.38366E-8	1.98837E-8	-6.02884E-7	-1.33801E-6	-1.11946E-5	-1.42795E-5	4.10715E1

Date of computation: 2025-09-10 09:18 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]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.093

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

medium high

Unit

Source

[6]

Diameter

Value

600

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.5441

0.1706

0.655

Unit

g-r

r-i

g-i

Source

[2]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Unit

Source

[3]

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Sources

No.	Name	Additional
[1]	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.)
[2]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[3]	EARN	1.) 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.) 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.)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

17364

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.534804

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1978-02-17.72182

Unit

Source

[2]

Last Observation

Value

2025-09-02.624868

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

868 (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

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 4947 Ninkasi 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	1972-11-02 21:58	< 1 min	0.1754120	0.1754101	0.0000006
EARTH	1980-10-30 16:45	< 1 min	0.1502641	0.1502638	0.0000001
EARTH	1988-10-27 08:33	< 1 min	0.1641627	0.1641622	0.0000001
MARS	2031-04-20 12:21	< 1 min	0.0291737	0.0291730	0.0000002
EARTH	2073-11-04 04:59	< 1 min	0.1850402	0.1850359	0.0000014
EARTH	2081-11-01 08:23	< 1 min	0.1543888	0.1543865	0.0000007
EARTH	2089-10-29 16:10	< 1 min	0.1520976	0.1520954	0.0000007
EARTH	2097-10-26 15:26	< 1 min	0.1785319	0.1785230	0.0000030

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
350.56862110	296.61724808	0.14963392	MINIMUM
193.84959128	137.54508975	0.59799698	SADDLE
358.01094721	125.06171417	2.14942011	SADDLE
175.59206465	302.50884015	2.59101937	MAXIMUM

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MOID Plots

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