Asteroids

285944 2001RZ11 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.082

Aphelion (Q)

3.302

Eccentricity (e)

0.506

Inclination (i)

53.1

deg

Orbit period (P)

1185.5

Earth MOID

0.08891

U parameter

0.0

Next Earth close approach

Date

2027-08-12

Nominal distance (from Earth center)

0.13636

20399395

Maximum Brightness

14.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.6

mag

Diameter

1000

Taxonomic type

Rotation period (T)

2.245

Discovery Information

Discovery Date

2001-09-10

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

2.192192

1-sigma variation

3.570E-9

Unit

Eccentricity (e)

Value

0.506305

1-sigma variation

6.281E-9

Unit

Inclination (i)

Value

53.1058

1-sigma variation

4.295E-6

Unit

Long. of Ascending Node (Ω)

Value

323.9812

1-sigma variation

1.305E-6

Unit

Arg. of Perihelion (ω)

Value

340.5686

1-sigma variation

6.608E-6

Unit

Mean Anomaly (M)

Value

174.70740

1-sigma variation

3.798E-6

Unit

Perihelion distance

Value

1.082275

1-sigma variation

Unit

Aphelion distance

Value

3.302109

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.089963

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.131842

1-sigma variation

Unit

MOID

Value

0.088909

1-sigma variation

Unit

Orbit Period

Value

1185.5402

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.27478E-17	1.95608E-18	4.93989E-16	-7.64102E-16	2.21748E-15	-1.16533E-14
e	1.95608E-18	3.94453E-17	-6.25765E-15	-6.71807E-16	-3.71015E-14	8.98310E-15
i	4.93989E-16	-6.25765E-15	1.84462E-11	2.00643E-12	1.34715E-12	-1.54567E-12
Ω	-7.64102E-16	-6.71807E-16	2.00643E-12	1.70227E-12	-2.93424E-12	1.65553E-12
ω	2.21748E-15	-3.71015E-14	1.34715E-12	-2.93424E-12	4.36614E-11	-1.46830E-11
M	-1.16533E-14	8.98310E-15	-1.54567E-12	1.65553E-12	-1.46830E-11	1.44260E-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

2.245

Unit

Source

[4]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.07

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

16.642

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.41

Unit

Source

[6]

Diameter

Value

1000

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

Visual S

Radar R

Unit

Source

[7]

[8]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) N. G. Simion et al, Spectral properties of near-Earth objects with low-Jovian Tisserand invariant (2021)
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Elenin, L. et al. (2015) MPB 42, 34-35. (LOW AMPLITUDE LIGHTCURVE FOR KM-SIZED NEAR-EARTH ASTEROID (285944) 2001 RZ11)
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs)
[7]	EARN	1.) Wigton, N. et al. (2015) DPS47-106.05. (astract) (3-um spectroscopy of Near-Earth Asteroids: Searching for OH/H2O on small planetary bodies)
[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

7825

Unit

Source

[1]

Unobserved

Value

956

Unit

Source

[1]

Normalized RMS of residuals

Value

0.35786

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-09-10.12105

Unit

Source

[2]

Last Observation

Value

2023-02-12.333098

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

955 (7)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2014-08-18

Unit

Source

[3]

Last Observation

Value

2014-08-24

Unit

Source

[3]

Delay (Discarded)

Value

5 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

5 (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 285944 2001RZ11 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	2001-08-21 23:47	< 1 s	0.1702284	0.1702279	0.0000002
EARTH	2014-08-17 03:15	< 1 s	0.0879049	0.0879049	0.0000000
EARTH	2027-08-12 23:26	< 1 s	0.1363615	0.1363611	0.0000002

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
10.67849715	221.79483322	0.09029045	MINIMUM
339.41134258	1.53341831	2.00424161	SADDLE
168.90717589	25.43605841	2.38260488	SADDLE
184.11180725	211.14638754	4.29135766	MAXIMUM

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MOID Plots

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