Asteroids

2021WY3 help

Last update: 2025-08-02 12:46 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.537

Aphelion (Q)

2.220

Eccentricity (e)

0.610

Inclination (i)

7.1

deg

Orbit period (P)

591.2

Earth MOID

0.10813

U parameter

0.8

Next Earth close approach

Date

2046-07-24

Nominal distance (from Earth center)

0.12696

18993189

Maximum Brightness

19.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.1

mag

Diameter

160 - 400*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-11-28

Observatory

Kitt Peak-Bok

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.378486

1-sigma variation

2.753E-8

Unit

Eccentricity (e)

Value

0.610319

1-sigma variation

6.530E-8

Unit

Inclination (i)

Value

7.0884

1-sigma variation

6.295E-6

Unit

Long. of Ascending Node (Ω)

Value

34.6471

1-sigma variation

4.542E-5

Unit

Arg. of Perihelion (ω)

Value

164.1672

1-sigma variation

4.704E-5

Unit

Mean Anomaly (M)

Value

353.53056

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.537170

1-sigma variation

Unit

Aphelion distance

Value

2.219802

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.102001

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.460977

1-sigma variation

Unit

MOID

Value

0.108129

1-sigma variation

Unit

Orbit Period

Value

591.1560

1-sigma variation

Unit

U parameter

Value

0.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.57629E-16	1.46563E-15	-1.14329E-13	-4.51637E-13	5.07575E-13	-4.97151E-13
e	1.46563E-15	4.26418E-15	-1.82631E-13	-3.51353E-13	4.47689E-13	-8.25607E-13
i	-1.14329E-13	-1.82631E-13	3.96261E-11	1.42860E-10	-1.46501E-10	7.63146E-11
Ω	-4.51637E-13	-3.51353E-13	1.42860E-10	2.06270E-9	-2.12232E-9	3.80302E-10
ω	5.07575E-13	4.47689E-13	-1.46501E-10	-2.12232E-9	2.21317E-9	-4.35919E-10
M	-4.97151E-13	-8.25607E-13	7.63146E-11	3.80302E-10	-4.35919E-10	3.56390E-10

Date of computation: 2025-08-02 12:46 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

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

21.121

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

160 - 400*

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

[-]

Download this part as:

Sources

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

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

2103

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.477029

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2019-10-29.352032

Unit

Source

[2]

Last Observation

Value

2025-08-01.591699

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

118 (0)

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 2021WY3 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	1957-07-18 10:57	< 1 min	0.1659228	0.1659157	0.0000024
EARTH	1966-12-21 14:46	< 1 min	0.1842966	0.1842844	0.0000040
EARTH	1978-07-30 18:51	< 1 min	0.1687781	0.1687663	0.0000039
EARTH	1988-01-01 16:10	< 1 min	0.1320795	0.1320707	0.0000030
EARTH	2012-07-25 20:52	< 1 min	0.1267368	0.1267357	0.0000004
EARTH	2021-12-28 18:18	< 1 s	0.1079567	0.1079564	0.0000001
EARTH	2046-07-24 14:00	< 1 min	0.1269616	0.1269595	0.0000007
EARTH	2055-12-28 05:31	< 1 min	0.1123023	0.1122964	0.0000020
EARTH	2080-07-23 11:29	1.6	0.1303816	0.1303643	0.0000058
EARTH	2089-12-26 23:52	2.5	0.1202910	0.1202418	0.0000164
EARTH	2114-07-24 09:53	6.5	0.1359772	0.1358763	0.0000337
EARTH	2123-12-27 21:39	11.3	0.1299750	0.1296919	0.0000946

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
297.74329367	354.81437298	0.10812903	MINIMUM
63.77454890	200.21975136	0.12524733	MINIMUM
1.71819252	98.43709735	0.46533924	SADDLE
180.29652109	277.25807170	1.22295933	SADDLE
2.06494740	279.14905637	1.53461659	SADDLE
180.63098965	97.42314315	3.22126989	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out