Asteroids

4953 1990MU help

Last update: 2025-03-28 16:24 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.555

Aphelion (Q)

2.688

Eccentricity (e)

0.657

Inclination (i)

24.4

deg

Orbit period (P)

754.2

Earth MOID

0.02540

U parameter

0.0

Next Earth close approach

Date

2027-06-06

Nominal distance (from Earth center)

0.03083

4612156

Maximum Brightness

9.6

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

2730

Taxonomic type

Rotation period (T)

14.22

Discovery Information

Discovery Date

1990-06-23

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

1.621540

1-sigma variation

1.960E-9

Unit

Eccentricity (e)

Value

0.657443

1-sigma variation

3.959E-8

Unit

Inclination (i)

Value

24.3797

1-sigma variation

4.139E-6

Unit

Long. of Ascending Node (Ω)

Value

77.5294

1-sigma variation

1.205E-5

Unit

Arg. of Perihelion (ω)

Value

77.9272

1-sigma variation

1.137E-5

Unit

Mean Anomaly (M)

Value

20.50652

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.555471

1-sigma variation

Unit

Aphelion distance

Value

2.687609

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.175639

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.052535

1-sigma variation

Unit

MOID

Value

0.025399

1-sigma variation

Unit

Orbit Period

Value

754.2057

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.84128E-18	-2.79351E-17	6.21746E-17	4.58140E-15	-3.45676E-15	-8.75831E-15
e	-2.79351E-17	1.56747E-15	2.27656E-15	2.92438E-14	7.35857E-14	7.27551E-14
i	6.21746E-17	2.27656E-15	1.71325E-11	-2.75513E-11	2.67103E-11	-2.09181E-12
Ω	4.58140E-15	2.92438E-14	-2.75513E-11	1.45135E-10	-1.25900E-10	-7.30876E-12
ω	-3.45676E-15	7.35857E-14	2.67103E-11	-1.25900E-10	1.29184E-10	-1.85926E-13
M	-8.75831E-15	7.27551E-14	-2.09181E-12	-7.30876E-12	-1.85926E-13	2.58783E-11

Date of computation: 2025-03-19 11:58 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

14.22

Unit

Source

[5]

Quality

Value

Unit

Source

[5]

Amplitude

Value

0.68

Unit

mag

Source

[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

Q,R;S

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

15.1

14.986

Unit

mag

Source

[5]

[6]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.228

0.52

Unit

Source

[7]

[8]

Diameter

Value

2730

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Radar R

Unit

Source

[9]

[10]

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Sources

No.	Name	Additional
[1]	EARN	1.) Whiteley, R.J. (2001) PhD. Thesis, University of Hawaii. (A Compositional and Dynamical Survey of the Near-Earth Asteroids)
[2]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[3]	EARN	1.) Hicks, M.D. et al. (1998) Icarus 133, 69-78. (The Unusual Spectra of 15 Near-Earth Asteroids and Extinct Comet Candidates)(1566,1620,2063,2102,2201,3200,4953,6053,6489, 7092,8176,1994ES1,1995CR,1996JA1) 2.) Whiteley, R.J. (2001) PhD. Thesis, University of Hawaii. (A Compositional and Dynamical Survey of the Near-Earth Asteroids)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Mottola, S. et al. (1995) Icarus 117, 62-70. (The near-earth objects follow-up program: First results.)(1981, 2062,4953,5633,5797,5836,1993BX3,1994AW1,1994JF1,1994LC1) 2.) Erikson, A. et al. (2000) Icarus 147, 487-497. (The Near-Earth Objects Follow-Up Program III: 32 Lightcurves for 12 Objects from 1992 to 1995) (433,1917,2368,3753,4769, 4953,6491, 1995 EK1, 1995 FJ; 5738,7467,1995 LH)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[8]	EARN	1.) Harris(DLR), A.W. et al. (2011) Astron. J. 141, 75. (ExploreNEOs. II. THE ACCURACY OF THE WARM SPITZER NEAR-EARTH OBJECT SURVEY) 2.) 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) 3.) Trilling, D.E. et al. (2010) Astron. J. 140, 770-784. (EXPLORENEOs. I. DESCRIPTION AND FIRST RESULTS FROM THE WARM SPITZER NEAR-EARTH OBJECT SURVEY) (diameters & albedos for 101 NEOs)
[9]	EARN	1.) Hicks, M.D. et al. (1998) Icarus 133, 69-78. (The Unusual Spectra of 15 Near-Earth Asteroids and Extinct Comet Candidates)(1566,1620,2063,2102,2201,3200,4953,6053,6489, 7092,8176,1994ES1,1995CR,1996JA1) 2.) Fevig. R.A. and U. Fink (2007) Icarus 188, 175-188. (Spectral observations of 19 weathered and 23 fresh NEAs and their correlations with orbital parameters)(433,1036, 1627,1685,1862,1866,1943,1980,3103,3122,3199,3671,4183,4341, 4954,5587,5751,5836,6037,7358,7482,7753,7822,7977,8201, 10563,11066,13651,13651,19356,20236,20255,35107,85490, J97GD32,J97UH9,J97US9,J98HE3,J98HT31,J98ME3,J98MS2,K04LC2)
[10]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Taylor, P.A. et al. (2012) CBET HREF="http://www.cbat.eps.harvard.edu/iau/cbet/003100/CBET003176.txt"> 3176. ((5143) HERACLES) (Radar binary detection)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

18503

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.42672

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1974-07-21.74676

Unit

Source

[2]

Last Observation

Value

2025-03-18.79297

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

2909 (29)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

1994-05-27

Unit

Source

[3]

Last Observation

Value

1994-05-28

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

2 (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 4953 1990MU 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	1954-12-04 22:14	< 1 min	0.1466475	0.1466468	0.0000002
EARTH	1963-06-10 04:09	< 1 min	0.0947699	0.0947693	0.0000002
EARTH	1985-11-20 10:40	< 1 min	0.1775624	0.1775617	0.0000002
EARTH	1994-05-30 10:36	< 1 s	0.1417751	0.1417744	0.0000002
EARTH	2018-11-29 10:37	< 1 s	0.1068307	0.1068305	0.0000001
EARTH	2027-06-06 22:42	< 1 s	0.0308304	0.0308297	0.0000002
EARTH	2049-11-24 11:48	< 1 min	0.1227552	0.1227538	0.0000005
EARTH	2058-06-05 10:16	< 1 min	0.0230907	0.0230892	0.0000005
EARTH	2080-11-19 01:00	< 1 min	0.1898269	0.1898063	0.0000069
EARTH	2089-05-30 18:04	< 1 min	0.1250846	0.1250555	0.0000097
EARTH	2113-12-06 18:42	< 1 min	0.1543523	0.1543383	0.0000047
EARTH	2122-06-13 23:29	< 1 min	0.1522797	0.1522681	0.0000039

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
56.09238191	152.10979856	0.02539859	MINIMUM
310.64232280	324.29635166	0.10519724	MINIMUM
4.24386101	60.67853823	0.53539612	SADDLE
2.71996558	237.04629523	1.53330982	SADDLE
181.63690810	233.19568076	1.81061490	SADDLE
179.62840980	52.19131835	3.61542556	MAXIMUM

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MOID Plots

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