Asteroids

496817 1989VB help

Last update: 2025-05-21 08:47 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

1.005

Aphelion (Q)

2.718

Eccentricity (e)

0.460

Inclination (i)

2.2

deg

Orbit period (P)

927.8

Earth MOID

0.01690

U parameter

0.0

Next Earth close approach

Date

2050-10-29

Nominal distance (from Earth center)

0.06916

10345834

Maximum Brightness

16.2

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

230

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1989-11-01

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.861662

1-sigma variation

3.056E-9

Unit

Eccentricity (e)

Value

0.460029

1-sigma variation

8.526E-9

Unit

Inclination (i)

Value

2.1845

1-sigma variation

2.346E-6

Unit

Long. of Ascending Node (Ω)

Value

37.8438

1-sigma variation

3.639E-5

Unit

Arg. of Perihelion (ω)

Value

330.9236

1-sigma variation

3.703E-5

Unit

Mean Anomaly (M)

Value

355.98606

1-sigma variation

3.031E-6

Unit

Perihelion distance

Value

1.005244

1-sigma variation

Unit

Aphelion distance

Value

2.718080

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.053947

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.448598

1-sigma variation

Unit

MOID

Value

0.016903

1-sigma variation

Unit

Orbit Period

Value

927.7900

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.33690E-18	4.33409E-18	-5.23093E-15	8.26291E-14	-8.88144E-14	-6.34183E-15
e	4.33409E-18	7.26977E-17	-8.46031E-16	7.96460E-14	-8.90823E-14	-9.24224E-16
i	-5.23093E-15	-8.46031E-16	5.50142E-12	-8.32174E-11	8.21792E-11	5.06613E-12
Ω	8.26291E-14	7.96460E-14	-8.32174E-11	1.32405E-9	-1.32277E-9	-7.52046E-11
ω	-8.88144E-14	-8.90823E-14	8.21792E-11	-1.32277E-9	1.37141E-9	6.44539E-11
M	-6.34183E-15	-9.24224E-16	5.06613E-12	-7.52046E-11	6.44539E-11	9.18768E-12

Date of computation: 2025-05-21 08:47 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

[4]

[5]

Quality

Value

Unit

Source

[4]

[5]

Amplitude

Value

0.32

>=0.32

Unit

mag

Source

[4]

[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

Unit

Source

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.94

19.965

Unit

mag

Source

[6]

[7]

Slope Parameter (G)

Value

0.15**

0.23

Unit

mag

Source

[7]

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.314

medium

Unit

Source

[8]

[9]

Diameter

Value

230

Unit

Source

[8]

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

[10]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.
[5]	EARN	1.) Wisniewski, W.Z. et al. (1997) Icarus 126, 395-449. (Photometric Observations of 125 Asteroids)
[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.) Wisniewski, W.Z. et al. (1997) Icarus 126, 395-449. (Photometric Observations of 125 Asteroids)
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	EARN	1.) Joseph R. Masiero et al 2020 Planet. Sci. J. 1 5
[9]	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)
[10]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

12109

Unit

Source

[1]

Unobserved

Value

921

Unit

Source

[1]

Normalized RMS of residuals

Value

0.369325

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1989-11-01.4105

Unit

Source

[2]

Last Observation

Value

2022-12-27.126705

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

304 (1)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2017-10-03

Unit

Source

[3]

Last Observation

Value

2017-10-10

Unit

Source

[3]

Delay (Discarded)

Value

4 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

6 (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 496817 1989VB 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	1956-10-13 02:39	< 1 min	0.0186550	0.0186546	0.0000002
MARS	1972-05-01 14:02	< 1 min	0.0487035	0.0487028	0.0000002
EARTH	1989-10-28 16:33	< 1 min	0.0670782	0.0670776	0.0000002
EARTH	2017-09-29 20:00	< 1 s	0.0202344	0.0202344	0.0000000
EARTH	2050-10-29 21:19	< 1 min	0.0691576	0.0691564	0.0000004
EARTH	2078-10-12 19:43	< 1 min	0.0173446	0.0173441	0.0000002

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
4.34816258	274.61621883	0.01690270	MINIMUM
179.29842495	85.78017471	1.71960408	SADDLE
358.17902743	84.48167109	2.00371597	SADDLE
179.35530452	265.81392198	3.71888289	MAXIMUM

Download:

MOID Plots

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