Asteroids

2021WR

Last update: 2022-01-23 14:32 UTC

Orbital Properties

Epoch

59600.0

MJD

Orbit type

Apollo

Perihelion (q)

0.976

Aphelion (Q)

4.058

Eccentricity (e)

0.612

Inclination (i)

1.3

deg

Orbit period (P)

1458.8

days

Earth MOID

0.01081

Next Earth close approach

Date

2025-11-22

Nominal distance (from Earth center)

0.04786

7159259

Maximum Brightness

20.7

Orbit Visualiser

Click the button to start Orbit Visualiser

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.5

Diameter

29*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-11-25

Observatory

ATLAS-HKO, Haleakala

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion
Aphelion
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period

Value

1-sigma variation

Unit

Epoch

Value

59600.0

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.52

1-sigma variation

5.74937E-4

Unit

Eccentricity (e)

Value

0.612223113792792

1-sigma variation

8.88244E-5

Unit

Inclination (i)

Value

1.26

1-sigma variation

1.534E-4

Unit

Ascending Node (Ω)

Value

226.66

1-sigma variation

1.134E-4

Unit

Arg. of Perihelion (ω)

Value

223.14

1-sigma variation

2.521E-4

Unit

Mean Anomaly (M)

Value

8.57

1-sigma variation

2.850E-3

Unit

Perihelion

Value

9.761E-1

1-sigma variation

Unit

Aphelion

Value

4.06

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.84

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

9.730E-2

1-sigma variation

Unit

MOID

Value

1.081E-2

1-sigma variation

Unit

Orbit Period

Value

1458.76

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.30552E-7	5.10684E-8	8.81113E-8	-4.70049E-8	1.36679E-7	-1.63831E-6
e	5.10684E-8	7.88977E-9	1.36126E-8	-7.26218E-9	2.11174E-8	-2.53110E-7
i	8.81113E-8	1.36126E-8	2.35290E-8	-1.20976E-8	3.59516E-8	-4.36698E-7
Ω	-4.70049E-8	-7.26218E-9	-1.20976E-8	1.28519E-8	-2.57101E-8	2.32988E-7
ω	1.36679E-7	2.11174E-8	3.59516E-8	-2.57101E-8	6.35626E-8	-6.77548E-7
M	-1.63831E-6	-2.53110E-7	-4.36698E-7	2.32988E-7	-6.77548E-7	8.11996E-6

Date of computation: 2021-12-10 11:58 UTC

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

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

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

25.458

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

Unit

Source

[-]

Diameter

Value

29*

Unit

Source

[2]

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

[-]

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Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

**Estimated value

Observational Information

Arc Length
Unobserved

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

days

Source

[1]

Unobserved

Value

Unit

days

Source

[1]

Astrometry Summary

RMS of Residuals
First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

RMS of Residuals

Value

0.569672

Unit

arcseconds

Source

[1]

First Observation

Value

2021-10-28.303048

Unit

Source

[2]

Last Observation

Value

2021-11-29.909538

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

72 (2)

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for OrbFit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	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 2021WR from 1950 to

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	2009-11-02 22:45	> 1 d	0.1864336	0.1026453	0.0216533
EARTH	2013-11-04 01:51	> 1 d	0.1668491	0.1066314	0.0164504
EARTH	2017-11-03 01:13	936.7	0.1841097	0.1546774	0.0090266
EARTH	2021-12-01 16:40	< 1 s	0.0173188	0.0173121	0.0000022
EARTH	2025-11-22 07:33	> 1 d	0.0478567	0.0195452	0.0066457
EARTH	2029-11-07 10:60	947.9	0.1754753	0.1477708	0.0085058
EARTH	2033-11-17 04:60	1111.1	0.1240869	0.1013240	0.0068917
EARTH	2037-11-14 11:25	675.2	0.1451210	0.1298812	0.0048132
EARTH	2045-11-23 07:33	303.8	0.1211081	0.1160310	0.0016569
EARTH	2049-12-03 10:53	1393.7	0.0629002	0.0519966	0.0033195
EARTH	2053-12-02 13:32	> 1 d	0.0693428	0.0531708	0.0047621
EARTH	2057-12-28 07:01	> 1 d	0.0615378	0.0584586	0.0016782
EARTH	2062-01-21 07:05	> 1 d	0.1659032	0.1302784	0.0106000

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