Asteroids

4486 Mithra help

Last update: 2025-10-20 13:32 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.750

Aphelion (Q)

3.663

Eccentricity (e)

0.660

Inclination (i)

3.0

deg

Orbit period (P)

1197.0

Earth MOID

0.04590

U parameter

0.0

Next Earth close approach

Date

2036-07-26

Nominal distance (from Earth center)

0.15576

23301862

Maximum Brightness

16.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

15.6

mag

Diameter

1849

Taxonomic type

Scomp

Rotation period (T)

100

Discovery Information

Discovery Date

1987-09-22

Observatory

NAO Rozhen, Smolyan

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

2.206312

1-sigma variation

6.421E-10

Unit

Eccentricity (e)

Value

0.660024

1-sigma variation

1.145E-8

Unit

Inclination (i)

Value

3.0308

1-sigma variation

1.403E-6

Unit

Long. of Ascending Node (Ω)

Value

82.1779

1-sigma variation

3.849E-5

Unit

Arg. of Perihelion (ω)

Value

169.2638

1-sigma variation

3.804E-5

Unit

Mean Anomaly (M)

Value

276.29053

1-sigma variation

1.725E-6

Unit

Perihelion distance

Value

0.750094

1-sigma variation

Unit

Aphelion distance

Value

3.662529

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.558972

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.261875

1-sigma variation

Unit

MOID

Value

0.045897

1-sigma variation

Unit

Orbit Period

Value

1197.0125

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.12269E-19	-2.19315E-18	1.71970E-17	1.24379E-16	-4.20333E-16	-7.12067E-16
e	-2.19315E-18	1.31142E-16	1.25648E-15	-2.26407E-14	2.15439E-14	4.84692E-15
i	1.71970E-17	1.25648E-15	1.96906E-12	5.13999E-11	-5.12319E-11	-3.44022E-13
Ω	1.24379E-16	-2.26407E-14	5.13999E-11	1.48115E-9	-1.46173E-9	-1.76497E-11
ω	-4.20333E-16	2.15439E-14	-5.12319E-11	-1.46173E-9	1.44732E-9	1.52940E-11
M	-7.12067E-16	4.84692E-15	-3.44022E-13	-1.76497E-11	1.52940E-11	2.97416E-12

Date of computation: 2025-10-20 13:32 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

100

Unit

Source

[3]

Quality

Value

2,R,T

Unit

Source

[3]

Amplitude

Value

1.0

Unit

mag

Source

[3]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Scomp

Unit

Source

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

15.616

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.297

Unit

Source

[5]

Diameter

Value

1849

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.42

0.81

Unit

V-R

B-V

Source

[6]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[7]

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Sources

No.	Name	Additional
[1]	EARN	1.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[2]	EARN	1.) Somers, J.M. et al. (2010) DPS 42, 1316. (abstract) (Optical Characterization Of Planetary Radar Targets, Low-deltaV, And Potentially Hazardous Asteroids: Results From 2009-2010) 2.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs) 3.) Popescu, M. et al. (2014) Astron. Astrophys. 572, A106. (Spectral properties of the largest asteroids associated with Taurid Complex) (2201,4183,4486,5143,6063,269690)
[3]	EARN	1.) Ostro, S.J. et al. (2000) B.A.A.S. 32,1003. (Radar observations of asteroid 4486 Mithra) 2.) Pravec, P. et al. (2005) Icarus 173, 108-131. (Tumbling asteroids) 3.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2488"> ATel#2488 (Optical Characterization of the Potentially Hazardous Asteroid and Planetary Radar Target 4486 Mithra: Evidence for Rotational Variability?)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs) 2.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.
[6]	EARN	1.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2488"> ATel#2488 (Optical Characterization of the Potentially Hazardous Asteroid and Planetary Radar Target 4486 Mithra: Evidence for Rotational Variability?)
[7]	EARN	1.) Brozovic, M. et al. (2010) Icarus 208, 207-220. (Radar observations and a physical model of contact binary Asteroid 4486 Mithra) 2.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 3.) Ostro, S.J. et al. (2000) B.A.A.S. 32,1003. (Radar observations of asteroid 4486 Mithra) 4.) Brozovic, M. et al. (2009) DPS 41, 4311. (Radar Observations and a Physical Model of Candidate Contact Binary Asteroid 4486 Mithra)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

18873

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.474527

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1974-02-16.9262

Unit

Source

[2]

Last Observation

Value

2025-10-19.481347

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1927 (6)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2000-07-22

Unit

Source

[3]

Last Observation

Value

2000-08-09

Unit

Source

[3]

Delay (Discarded)

Value

8 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

9 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

17 (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 4486 Mithra 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
VENUS	1951-07-09 11:34	< 1 min	0.0284608	0.0284607	0.0000001
EARTH	1951-08-22 17:42	< 1 min	0.1638593	0.1638569	0.0000008
EARTH	1961-03-11 03:00	< 1 min	0.1815291	0.1815266	0.0000008
EARTH	1974-04-14 15:43	< 1 min	0.1708646	0.1708633	0.0000004
VENUS	1993-12-23 01:18	< 1 min	0.0186402	0.0186401	0.0000000
EARTH	2000-08-14 08:13	< 1 s	0.0465422	0.0465422	0.0000000
EARTH	2010-03-12 13:45	< 1 s	0.1889593	0.1889592	0.0000001
EARTH	2023-04-11 16:48	< 1 min	0.1626665	0.1626663	0.0000001
EARTH	2036-07-26 06:18	< 1 min	0.1557633	0.1557630	0.0000001
VENUS	2056-02-04 01:58	< 1 min	0.0166403	0.0166402	0.0000000
EARTH	2059-04-01 18:17	< 1 min	0.1031311	0.1031305	0.0000002
EARTH	2085-08-24 09:33	< 1 min	0.1342627	0.1342591	0.0000012

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
34.80702104	220.15352406	0.04589651	MINIMUM
326.21933533	81.44801002	0.05171312	MINIMUM
0.63147634	150.89518598	0.26591662	SADDLE
0.69995084	331.06919538	1.73581250	SADDLE
180.13785717	330.34899632	2.67680410	SADDLE
180.16169115	150.36373468	4.67834153	MAXIMUM

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MOID Plots

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