Asteroids

162000 1990OS help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.902

Aphelion (Q)

2.454

Eccentricity (e)

0.462

Inclination (i)

1.1

deg

Orbit period (P)

794.2

Earth MOID

0.00902

U parameter

0.0

Next Earth close approach

Date

2027-07-29

Nominal distance (from Earth center)

0.12898

19295175

Maximum Brightness

17.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.6

mag

Diameter

320

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1990-07-21

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

1.678435

1-sigma variation

1.880E-9

Unit

Eccentricity (e)

Value

0.462373

1-sigma variation

2.241E-8

Unit

Inclination (i)

Value

1.0912

1-sigma variation

1.625E-6

Unit

Long. of Ascending Node (Ω)

Value

346.4899

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

21.6234

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

60.95739

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.902372

1-sigma variation

Unit

Aphelion distance

Value

2.454497

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.084988

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.321257

1-sigma variation

Unit

MOID

Value

0.009020

1-sigma variation

Unit

Orbit Period

Value

794.2460

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.53602E-18	-2.64391E-17	6.45834E-16	-8.53321E-14	9.38016E-14	-1.55816E-14
e	-2.64391E-17	5.02032E-16	-1.27194E-15	1.44111E-12	-1.63705E-12	1.42307E-13
i	6.45834E-16	-1.27194E-15	2.64151E-12	2.65790E-10	-2.64160E-10	-3.21166E-12
Ω	-8.53321E-14	1.44111E-12	2.65790E-10	3.63030E-8	-3.65942E-8	3.49178E-10
ω	9.38016E-14	-1.63705E-12	-2.64160E-10	-3.65942E-8	3.69677E-8	-3.98979E-10
M	-1.55816E-14	1.42307E-13	-3.21166E-12	3.49178E-10	-3.98979E-10	7.12354E-11

Date of computation: 2025-09-10 00:30 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

[1]

Quality

Value

B,R

Unit

Source

[1]

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

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.572

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.296

Unit

Source

[3]

Diameter

Value

320

Unit

Source

[3]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[4]

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Sources

No.	Name	Additional
[1]	EARN	1.) Ostro, S.J. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08237.html"> 8237. (1990 OS) (radar obs. binary asteroid) 2.) Pravec, P. et al (2016) Icarus 267,267-295. (Binary asteroid population. 3. Secondary rotations and elongations) (..,..)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	EARN	1.) Joseph R. Masiero et al 2020 Planet. Sci. J. 1 5
[4]	EARN	1.) Ostro, S.J. et al. (1991) Astron. J. 102, 1490-1502. (Asteroid radar astrometry) 2.) Ostro, S.J. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08237.html"> 8237. (1990 OS) (radar obs. binary asteroid)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

12258

Unit

Source

[1]

Unobserved

Value

644

Unit

Source

[1]

Normalized RMS of residuals

Value

0.473315

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1990-07-21.41111

Unit

Source

[2]

Last Observation

Value

2024-02-11.22619

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

421 (3)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

1990-08-02

Unit

Source

[3]

Last Observation

Value

2003-11-12

Unit

Source

[3]

Delay (Discarded)

Value

5 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

4 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

9 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 162000 1990OS 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	1955-11-08 21:39	< 1 min	0.0308352	0.0308320	0.0000011
MARS	1964-11-20 10:50	< 1 min	0.0456776	0.0456773	0.0000001
EARTH	1966-08-07 22:56	< 1 min	0.0278708	0.0278699	0.0000003
MARS	1975-02-20 04:53	< 1 min	0.0371960	0.0371954	0.0000002
EARTH	1979-11-24 14:01	< 1 min	0.0984743	0.0984734	0.0000003
EARTH	1990-08-06 16:03	< 1 min	0.0406126	0.0406122	0.0000001
EARTH	2003-11-12 00:37	< 1 s	0.0228404	0.0228404	0.0000000
EARTH	2027-07-29 21:38	< 1 min	0.1289803	0.1289796	0.0000002
EARTH	2040-09-04 23:04	< 1 min	0.0823807	0.0823804	0.0000001
EARTH	2053-11-16 05:44	< 1 min	0.0203827	0.0203823	0.0000001
EARTH	2077-10-18 19:24	< 1 min	0.0861701	0.0861679	0.0000008
EARTH	2101-08-24 04:44	< 1 min	0.0492230	0.0492205	0.0000008
EARTH	2114-12-03 18:47	< 1 min	0.1992936	0.1992890	0.0000016
EARTH	2125-08-17 11:11	< 1 min	0.0212250	0.0212164	0.0000029

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
329.13570251	217.48179004	0.00894933	MINIMUM
27.28465542	310.21544557	0.01717233	MINIMUM
358.14127804	263.83235177	0.09910527	SADDLE
179.28197673	85.05009420	1.45609078	SADDLE
358.03395918	83.65135905	1.90073893	SADDLE
179.26675594	265.03979880	3.45572043	MAXIMUM

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MOID Plots

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