Asteroids

357439 2004BL86 help

Last update: 2026-02-04 13:15 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.898

Aphelion (Q)

2.107

Eccentricity (e)

0.403

Inclination (i)

23.8

deg

Orbit period (P)

672.6

Earth MOID

0.00739

U parameter

0.0

Next Earth close approach

Date

2050-01-22

Nominal distance (from Earth center)

0.07065

10568476

Maximum Brightness

16.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.3

mag

Diameter

325

Taxonomic type

Rotation period (T)

2.620

Discovery Information

Discovery Date

2004-01-30

Observatory

Lincoln Laboratory ETS, New Mexico

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

1.502293

1-sigma variation

4.836E-9

Unit

Eccentricity (e)

Value

0.402501

1-sigma variation

1.565E-8

Unit

Inclination (i)

Value

23.7853

1-sigma variation

1.268E-6

Unit

Long. of Ascending Node (Ω)

Value

126.6468

1-sigma variation

2.656E-7

Unit

Arg. of Perihelion (ω)

Value

311.5375

1-sigma variation

6.241E-6

Unit

Mean Anomaly (M)

Value

334.99261

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.897619

1-sigma variation

Unit

Aphelion distance

Value

2.106967

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.008516

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.700875

1-sigma variation

Unit

MOID

Value

0.007388

1-sigma variation

Unit

Orbit Period

Value

672.5593

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.33877E-17	-5.24184E-17	3.36983E-15	-5.77981E-16	2.27838E-14	-5.73508E-14
e	-5.24184E-17	2.44789E-16	-1.49736E-14	2.23023E-15	-9.72350E-14	1.43248E-13
i	3.36983E-15	-1.49736E-14	1.60688E-12	-1.11447E-13	5.99985E-12	-9.13298E-12
Ω	-5.77981E-16	2.23023E-15	-1.11447E-13	7.05507E-14	-8.99861E-13	1.52285E-12
ω	2.27838E-14	-9.72350E-14	5.99985E-12	-8.99861E-13	3.89455E-11	-6.12061E-11
M	-5.73508E-14	1.43248E-13	-9.13298E-12	1.52285E-12	-6.12061E-11	1.42335E-10

Date of computation: 2026-02-04 13:15 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

2.620

Unit

Source

[3]

Quality

Value

3,B,R

Unit

Source

[3]

Amplitude

Value

0.17

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

Unit

Source

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.269

19.51

Unit

mag

Source

[4]

[5]

Slope Parameter (G)

Value

0.34

0.15**

Unit

Source

[5]

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[-]

Diameter

Value

325

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.5

0.95

Unit

V-R

B-V

Source

[5]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[7]

[8]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[9]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Birlan, M et al. (2015) Astron. Astrophys. 581, A3. (Characterization of (357439) 2004 BL86 on its close approach to Earth in 2015)
[2]	EARN	1.) Birlan, M et al. (2015) Astron. Astrophys. 581, A3. (Characterization of (357439) 2004 BL86 on its close approach to Earth in 2015) 2.) Franco, L. (2015) MPB 42, 186-187. (LOW RESOLUTION VISIBLE REFLECTANCE SPECTRUM FOR NEA (357439) 2004 BL86)
[3]	EARN	1.) Pollock, J. et al. (2015) CBET HREF="http://www.cbat.eps.harvard.edu/iau/cbet/004000/CBET004063.txt"> 4063. ((357439) 2004 BL86) (Photometric detection of binary) 2.) href="http://echo.jpl.nasa.gov/asteroids/2004BL86/2004BL86_planning.html"> Goldstone Radar Observations Planning: (357439) 2004 BL86 by 3.) Birlan, M et al. (2015) Astron. Astrophys. 581, A3. (Characterization of (357439) 2004 BL86 on its close approach to Earth in 2015)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Reddy, V. et al. (2015) Astrophys. J. 811_65 (10pp). (THE PHYSICAL CHARACTERIZATION OF THE POTENTIALLY HAZARDOUS ASTEROID 2004 BL86: A FRAGMENT OF A DIFFERENTIATED ASTEROID)
[6]	EARN	1.) href="http://www.jpl.nasa.gov/news/news.php?feature=4459"> NASA Press Release on 2004 BL86 fly by 2.) Benner, L.A.M. et al. (2015) CBET HREF="http://www.cbat.eps.harvard.edu/iau/cbet/004000/CBET004063.txt"> 4063. ((357439) 2004 BL86) (Radar observations) 3.) Birlan, M et al. (2015) Astron. Astrophys. 581, A3. (Characterization of (357439) 2004 BL86 on its close approach to Earth in 2015) 4.) Reddy, V. et al. (2015) Astrophys. J. 811_65 (10pp). (THE PHYSICAL CHARACTERIZATION OF THE POTENTIALLY HAZARDOUS ASTEROID 2004 BL86: A FRAGMENT OF A DIFFERENTIATED ASTEROID) 5.) Benner, L.A. et al. (2015) DPS47-204.07. (astract) (Radar imaging of binary near-Earth asteroid (357439) 2004 BL86)
[7]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) href="http://www.jpl.nasa.gov/news/news.php?feature=4459"> NASA Press Release on 2004 BL86 fly by 3.) Benner, L.A.M. et al. (2015) CBET HREF="http://www.cbat.eps.harvard.edu/iau/cbet/004000/CBET004063.txt"> 4063. ((357439) 2004 BL86) (Radar observations) 4.) Benner, L.A. et al. (2015) DPS47-204.07. (astract) (Radar imaging of binary near-Earth asteroid (357439) 2004 BL86)
[8]	EARN	1.) Franco, L. (2015) MPB 42, 186-187. (LOW RESOLUTION VISIBLE REFLECTANCE SPECTRUM FOR NEA (357439) 2004 BL86) 2.) Takir, D. et al. (2015) DPS47-106.05. (astract) (Are near-Earth Vestoids volatile-rich asteroids?) 3.) Wigton, N. et al. (2015) DPS47-106.05. (astract) (3-um spectroscopy of Near-Earth Asteroids: Searching for OH/H2O on small planetary bodies)
[9]	EARN	Earth Asteroids Research Node: https://earn.dlr.de

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

7993

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.443338

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-01-30.39919

Unit

Source

[2]

Last Observation

Value

2025-12-18.08841

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1089 (9)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2015-01-26

Unit

Source

[3]

Last Observation

Value

2015-01-31

Unit

Source

[3]

Delay (Discarded)

Value

9 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

4 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

13 (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 357439 2004BL86 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1969-01-16 22:53	< 1 min	0.1392556	0.1392524	0.0000011
EARTH	1980-02-02 21:27	< 1 min	0.1234960	0.1234927	0.0000011
EARTH	2015-01-26 16:19	< 1 s	0.0080188	0.0080188	0.0000000
EARTH	2050-01-22 01:52	< 1 min	0.0706459	0.0706428	0.0000010
EARTH	2061-02-06 03:47	< 1 min	0.1945991	0.1945971	0.0000006
EARTH	2096-01-25 15:49	< 1 min	0.0238769	0.0238744	0.0000008
EARTH	2107-02-01 18:18	< 1 min	0.0854693	0.0854597	0.0000032

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
32.35835151	24.44445610	0.00738795	MINIMUM
301.51526469	253.96835874	0.38777027	MINIMUM
327.33303018	288.92284147	0.40672959	SADDLE
170.09191533	152.59716516	1.18706760	SADDLE
353.16625399	149.33002789	1.88795472	SADDLE
183.24520655	341.38746716	3.06110254	MAXIMUM

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MOID Plots

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