Asteroids

496816 1989UP help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.982

Aphelion (Q)

2.740

Eccentricity (e)

0.472

Inclination (i)

3.9

deg

Orbit period (P)

927.6

Earth MOID

0.00562

U parameter

0.0

Next Earth close approach

Date

2050-12-08

Nominal distance (from Earth center)

0.02673

3998189

Maximum Brightness

15.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.5

mag

Diameter

200

Taxonomic type

Rotation period (T)

6.980

Discovery Information

Discovery Date

1989-10-27

Observatory

Steward Observatory, Kitt Peak-Spacewatch

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

1.861399

1-sigma variation

1.447E-9

Unit

Eccentricity (e)

Value

0.472272

1-sigma variation

1.504E-8

Unit

Inclination (i)

Value

3.8548

1-sigma variation

2.593E-6

Unit

Long. of Ascending Node (Ω)

Value

53.1502

1-sigma variation

2.332E-5

Unit

Arg. of Perihelion (ω)

Value

17.8361

1-sigma variation

2.350E-5

Unit

Mean Anomaly (M)

Value

51.74610

1-sigma variation

2.605E-6

Unit

Perihelion distance

Value

0.982312

1-sigma variation

Unit

Aphelion distance

Value

2.740486

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.008614

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.614751

1-sigma variation

Unit

MOID

Value

0.005617

1-sigma variation

Unit

Orbit Period

Value

927.5936

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.09480E-18	-1.04242E-17	-2.81250E-17	1.38264E-14	-1.22416E-14	-2.39203E-15
e	-1.04242E-17	2.26099E-16	1.27233E-16	-6.97407E-14	1.05192E-13	2.40335E-15
i	-2.81250E-17	1.27233E-16	6.72392E-12	-3.26765E-11	3.37931E-11	-3.95220E-13
Ω	1.38264E-14	-6.97407E-14	-3.26765E-11	5.43897E-10	-5.29871E-10	-1.79701E-11
ω	-1.22416E-14	1.05192E-13	3.37931E-11	-5.29871E-10	5.52430E-10	4.62657E-12
M	-2.39203E-15	2.40335E-15	-3.95220E-13	-1.79701E-11	4.62657E-12	6.78812E-12

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

6.980

Unit

Source

[3]

[4]

Quality

Value

Unit

Source

[3]

[4]

Amplitude

Value

1.16

Unit

mag

Source

[3]

[4]

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

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.534

20.7

Unit

mag

Source

[5]

[3]

Slope Parameter (G)

Value

0.23

0.15**

Unit

mag

Source

[3]

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

medium

0.282

Unit

Source

[7]

[6]

Diameter

Value

200

Unit

Source

[6]

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

[8]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	EARN	1.) Wisniewski, W.Z. et al. (1997) Icarus 126, 395-449. (Photometric Observations of 125 Asteroids)
[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]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Joseph R. Masiero et al 2020 Planet. Sci. J. 1 5
[7]	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)
[8]	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

12162

Unit

Source

[1]

Unobserved

Value

993

Unit

Source

[1]

Normalized RMS of residuals

Value

0.502544

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1989-10-27.35742

Unit

Source

[2]

Last Observation

Value

2023-02-13.161922

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

383 (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

2017-10-31

Unit

Source

[3]

Last Observation

Value

2017-10-31

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (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 496816 1989UP 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	1966-12-29 20:00	< 1 min	0.0772417	0.0772407	0.0000004
EARTH	1989-11-03 09:50	< 1 min	0.0494788	0.0494785	0.0000001
EARTH	2017-11-02 16:24	< 1 s	0.0549387	0.0549386	0.0000000
EARTH	2050-12-08 08:31	< 1 min	0.0267262	0.0267260	0.0000001
EARTH	2078-12-13 13:35	< 1 min	0.0325657	0.0325651	0.0000002
MARS	2093-12-29 06:26	< 1 min	0.0466005	0.0465993	0.0000004
EARTH	2101-10-22 11:24	< 1 min	0.1592640	0.1592593	0.0000016

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
351.34643299	315.00997103	0.00563219	MINIMUM
179.74453972	148.39092028	1.72688131	SADDLE
359.10647130	147.75103581	1.99605984	SADDLE
179.63354515	328.32926253	3.72627024	MAXIMUM

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MOID Plots

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