Asteroids

490581 2009WZ104 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.691

Aphelion (Q)

1.020

Eccentricity (e)

0.193

Inclination (i)

9.8

deg

Orbit period (P)

289.0

Earth MOID

0.03019

U parameter

0.1

Next Earth close approach

Date

2028-12-14

Nominal distance (from Earth center)

0.03196

4781171

Maximum Brightness

13.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.5

mag

Diameter

200

Taxonomic type

Rotation period (T)

19.30

Discovery Information

Discovery Date

2009-11-25

Observatory

Catalina Sky Survey

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

0.855503

1-sigma variation

1.840E-9

Unit

Eccentricity (e)

Value

0.192624

1-sigma variation

5.548E-8

Unit

Inclination (i)

Value

9.8350

1-sigma variation

1.173E-5

Unit

Long. of Ascending Node (Ω)

Value

263.2345

1-sigma variation

9.424E-6

Unit

Arg. of Perihelion (ω)

Value

10.5876

1-sigma variation

2.770E-5

Unit

Mean Anomaly (M)

Value

209.78430

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.690712

1-sigma variation

Unit

Aphelion distance

Value

1.020294

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.324670

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.031812

1-sigma variation

Unit

MOID

Value

0.030185

1-sigma variation

Unit

Orbit Period

Value

289.0218

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.38500E-18	-5.94979E-17	-5.88906E-15	1.53703E-15	-2.22549E-14	-2.51521E-14
e	-5.94979E-17	3.07859E-15	2.16430E-13	-2.79836E-14	1.01231E-12	-9.15788E-13
i	-5.88906E-15	2.16430E-13	1.37556E-10	-5.23926E-11	2.57723E-11	1.00293E-10
Ω	1.53703E-15	-2.79836E-14	-5.23926E-11	8.88041E-11	-1.10947E-10	3.40080E-12
ω	-2.22549E-14	1.01231E-12	2.57723E-11	-1.10947E-10	7.67531E-10	-7.39116E-10
M	-2.51521E-14	-9.15788E-13	1.00293E-10	3.40080E-12	-7.39116E-10	1.82238E-9

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

19.30

Unit

Source

[2]

[4]

Quality

Value

Unit

Source

[2]

[4]

Amplitude

Value

0.52

Unit

mag

Source

[2]

[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]

[2]

Taxonomy (all)

Value

R;Q

Unit

Source

[3]

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.538

20.52

Unit

mag

Source

[5]

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.314

Unit

Source

[7]

[6]

Diameter

Value

200

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.18

0.65

-0.26

Unit

V-R

B-V

R-I

Source

[2]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[8]

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Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	1.) Karashevich, S.V. et al. (2012) SSR 46, 130-135. (Astrometric and Photometric Studies of the 2009 WZ104 Asteroid as It Approached the Earth)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Karashevich, S.V.; Devyatkin, A.V.; Verestchagina, I.A.; Lyvov, V.N.; Tsekmeister, S.D. (2012) Solar System Research 46, 130-135
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.
[7]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 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

7014

Unit

Source

[1]

Unobserved

Value

262

Unit

Source

[1]

Normalized RMS of residuals

Value

0.213348

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-11-19.06586

Unit

Source

[2]

Last Observation

Value

2025-01-31.621898

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1208 (0)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2013-12-09

Unit

Source

[3]

Last Observation

Value

2013-12-09

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 490581 2009WZ104 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	1956-12-04 23:09	< 1 min	0.0483787	0.0483762	0.0000008
EARTH	1961-01-15 10:14	< 1 min	0.1367807	0.1367781	0.0000009
EARTH	1975-12-13 07:26	< 1 min	0.0311109	0.0311108	0.0000000
EARTH	1980-01-20 08:52	< 1 min	0.1831607	0.1831596	0.0000004
EARTH	1990-11-28 03:23	< 1 min	0.1571599	0.1571586	0.0000004
EARTH	1994-12-26 05:04	< 1 min	0.0601794	0.0601787	0.0000002
EARTH	2009-12-04 19:21	< 1 s	0.0503081	0.0503079	0.0000001
EARTH	2014-01-15 04:25	< 1 min	0.1359323	0.1359319	0.0000001
EARTH	2028-12-14 02:15	< 1 min	0.0319602	0.0319598	0.0000001
EARTH	2043-11-29 22:05	< 1 min	0.1060403	0.1060361	0.0000014
EARTH	2048-01-07 01:44	< 1 min	0.0969186	0.0969156	0.0000010
EARTH	2062-12-13 02:36	< 1 min	0.0302667	0.0302663	0.0000001
EARTH	2067-01-20 13:10	< 1 min	0.1993819	0.1993791	0.0000009
EARTH	2077-11-29 08:03	< 1 min	0.1074220	0.1074166	0.0000018
EARTH	2082-01-05 17:29	< 1 min	0.0944193	0.0944157	0.0000012
EARTH	2096-12-08 06:24	< 1 min	0.0338162	0.0338153	0.0000003
EARTH	2101-01-17 15:06	< 1 min	0.1505686	0.1505666	0.0000006
EARTH	2115-12-10 04:52	< 1 min	0.0332887	0.0332877	0.0000003
EARTH	2120-01-17 02:07	< 1 min	0.1417761	0.1417726	0.0000012

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
162.85279530	337.83780140	0.03005101	MINIMUM
8.92038897	182.17856362	0.32783328	SADDLE
1.84140134	353.48706070	1.67420370	SADDLE
179.92981658	171.51160254	2.03614132	MAXIMUM

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MOID Plots

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