Asteroids

471241 2011BX18 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.768

Aphelion (Q)

4.963

Eccentricity (e)

0.732

Inclination (i)

14.7

deg

Orbit period (P)

1771.7

Earth MOID

0.03735

U parameter

0.0

Next Earth close approach

Date

2050-08-05

Nominal distance (from Earth center)

0.08767

13115534

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.5

mag

Diameter

3000

Taxonomic type

Rotation period (T)

3.448

Discovery Information

Discovery Date

2011-01-26

Observatory

Mt. Lemmon 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

2.865489

1-sigma variation

1.082E-8

Unit

Eccentricity (e)

Value

0.732125

1-sigma variation

1.431E-8

Unit

Inclination (i)

Value

14.6952

1-sigma variation

6.661E-6

Unit

Long. of Ascending Node (Ω)

Value

310.4064

1-sigma variation

1.775E-5

Unit

Arg. of Perihelion (ω)

Value

304.5157

1-sigma variation

1.794E-5

Unit

Mean Anomaly (M)

Value

334.93638

1-sigma variation

3.445E-6

Unit

Perihelion distance

Value

0.767592

1-sigma variation

Unit

Aphelion distance

Value

4.963385

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.076122

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.286165

1-sigma variation

Unit

MOID

Value

0.037346

1-sigma variation

Unit

Orbit Period

Value

1771.7257

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.16986E-16	-9.86956E-17	2.57365E-14	5.53470E-14	-2.65138E-14	-3.49518E-14
e	-9.86956E-17	2.04889E-16	-8.23173E-15	-8.64561E-15	-1.08297E-14	2.71533E-14
i	2.57365E-14	-8.23173E-15	4.43658E-11	8.23955E-11	-7.97694E-11	-1.37979E-12
Ω	5.53470E-14	-8.64561E-15	8.23955E-11	3.15228E-10	-3.08160E-10	2.01187E-13
ω	-2.65138E-14	-1.08297E-14	-7.97694E-11	-3.08160E-10	3.21804E-10	-9.38166E-12
M	-3.49518E-14	2.71533E-14	-1.37979E-12	2.01187E-13	-9.38166E-12	1.18665E-11

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

3.448

Unit

Source

[4]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.27-0.32

Unit

mag

Source

[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

Unit

Source

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.454

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.044

0.012

Unit

Source

[7]

[6]

Diameter

Value

3000

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	1.) N. G. Simion et al, Spectral properties of near-Earth objects with low-Jovian Tisserand invariant (2021)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Carbognani, A. (2017) MPB 44, 52-57. (ASTEROIDS LIGHTCURVES ANALYSIS AT OAVDA: 2016 JANUARY - OCTOBER) (..,7350,10150, 357024,458198) 2.) Warner, B.D. (2017) MPB 44, 22-36. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2016 JULY-SEPTEMBER) (46 NEAs)
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Mommert, M. et al. (2015) Astron. J. 150, 106(9pp). (ExploreNEOs VIII: Dormant Short-Period Comets in the Near-Earth Asteroid Population) (23 NEOs)
[7]	EARN	1.) Masiero, J.R. et al. (2018) Astron. J. 154_168(10pp). (NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos) (170NEOs, 6110MBAs)
[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

3932

Unit

Source

[1]

Unobserved

Value

1467

Unit

Source

[1]

Normalized RMS of residuals

Value

0.707042

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-01-26.31025

Unit

Source

[2]

Last Observation

Value

2021-11-01.246514

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

2099 (35)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2016-08-07

Unit

Source

[3]

Last Observation

Value

2016-08-07

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

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 471241 2011BX18 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	1963-03-26 19:11	< 1 min	0.1690536	0.1690516	0.0000007
EARTH	2016-07-25 17:48	< 1 s	0.1353063	0.1353062	0.0000000
EARTH	2050-08-05 06:26	< 1 min	0.0876719	0.0876695	0.0000008
EARTH	2074-08-08 00:09	< 1 min	0.0788269	0.0788253	0.0000005
EARTH	2117-07-21 16:37	2.9	0.1606285	0.1605969	0.0000105

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
26.95315803	215.66045518	0.03576900	MINIMUM
331.00563373	84.20260689	0.22144944	MINIMUM
355.00274150	139.82690219	0.31602697	SADDLE
359.61583301	331.96164505	1.74425780	SADDLE
179.67413566	333.48239892	4.00968059	SADDLE
180.35699955	153.75572907	5.96386634	MAXIMUM

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MOID Plots

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