Asteroids

172034 2001WR1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.019

Aphelion (Q)

1.536

Eccentricity (e)

0.203

Inclination (i)

25.0

deg

Orbit period (P)

527.2

Earth MOID

0.07509

U parameter

0.0

Next Earth close approach

Date

2040-10-04

Nominal distance (from Earth center)

0.1866

27915514

Maximum Brightness

16.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.8

mag

Diameter

630

Taxonomic type

Rotation period (T)

8.047

Discovery Information

Discovery Date

2001-11-17

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

1.277250

1-sigma variation

1.761E-9

Unit

Eccentricity (e)

Value

0.202530

1-sigma variation

6.052E-8

Unit

Inclination (i)

Value

25.0278

1-sigma variation

9.934E-6

Unit

Long. of Ascending Node (Ω)

Value

6.5003

1-sigma variation

8.100E-6

Unit

Arg. of Perihelion (ω)

Value

48.5647

1-sigma variation

2.033E-5

Unit

Mean Anomaly (M)

Value

215.91041

1-sigma variation

0.00002

Unit

Perihelion distance

Value

1.018569

1-sigma variation

Unit

Aphelion distance

Value

1.535931

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.078093

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.415322

1-sigma variation

Unit

MOID

Value

0.075087

1-sigma variation

Unit

Orbit Period

Value

527.2448

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.10255E-18	-8.75612E-18	-2.39940E-15	2.93401E-16	4.93426E-15	-1.66284E-14
e	-8.75612E-18	3.66317E-15	9.92085E-14	-3.09180E-14	-5.93086E-13	3.66316E-13
i	-2.39940E-15	9.92085E-14	9.86772E-11	-2.20147E-11	-1.86866E-12	2.15051E-11
Ω	2.93401E-16	-3.09180E-14	-2.20147E-11	6.56126E-11	-7.74673E-11	2.46558E-11
ω	4.93426E-15	-5.93086E-13	-1.86866E-12	-7.74673E-11	4.13458E-10	-3.31176E-10
M	-1.66284E-14	3.66316E-13	2.15051E-11	2.46558E-11	-3.31176E-10	3.68116E-10

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

8.047

Unit

Source

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

0.95

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

17.796

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.34

Unit

Source

[5]

Diameter

Value

630

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	EARN	1.) Warner, B.D. (2018) MPB 45, 248-256. (Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2018 January-April)(28 NEOs)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	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) 2.) Nugent, C.R. et al. (2016) Astron. J. 152_63 (12pp) (NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos) (207 NEOs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

26081

Unit

Source

[1]

Unobserved

Value

445

Unit

Source

[1]

Normalized RMS of residuals

Value

0.541761

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1953-02-14.47292

Unit

Source

[2]

Last Observation

Value

2024-07-12.933074

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

928 (5)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

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 172034 2001WR1 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	1952-09-27 11:16	< 1 min	0.1804750	0.1804735	0.0000005
EARTH	2040-10-04 20:18	< 1 s	0.1866037	0.1866026	0.0000004
EARTH	2053-10-04 21:04	< 1 s	0.1659499	0.1659485	0.0000004
EARTH	2066-10-05 01:50	< 1 min	0.1602327	0.1602312	0.0000005
EARTH	2079-10-05 12:21	< 1 min	0.1726958	0.1726944	0.0000005

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
321.94865876	267.55020043	0.07560701	MINIMUM
97.02944432	62.63463375	0.36843713	MINIMUM
40.75075036	2.59929186	0.45350241	SADDLE
208.45252311	154.12453815	0.70567326	SADDLE
9.11352059	142.10778898	1.99901738	SADDLE
167.45835135	299.34350249	2.50039360	MAXIMUM

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MOID Plots

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