Asteroids

2021WY2 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.411

Aphelion (Q)

4.534

Eccentricity (e)

0.834

Inclination (i)

5.3

deg

Orbit period (P)

1420.0

Earth MOID

0.00685

U parameter

8.3

Next Earth close approach

Date

2045-07-12

Nominal distance (from Earth center)

0.17594

26320418

Maximum Brightness

26.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

11 - 24*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-11-28

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

2.472468

1-sigma variation

0.008110

Unit

Eccentricity (e)

Value

0.833946

1-sigma variation

0.000666

Unit

Inclination (i)

Value

5.3237

1-sigma variation

0.0061

Unit

Long. of Ascending Node (Ω)

Value

63.7008

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

110.7557

1-sigma variation

0.0023

Unit

Mean Anomaly (M)

Value

357.76421

1-sigma variation

1.75800

Unit

Perihelion distance

Value

0.410563

1-sigma variation

Unit

Aphelion distance

Value

4.534374

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.082461

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.433456

1-sigma variation

Unit

MOID

Value

0.006848

1-sigma variation

Unit

Orbit Period

Value

1420.0202

1-sigma variation

Unit

U parameter

Value

8.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.57748E-5	5.39932E-6	4.94829E-5	2.26789E-6	1.83589E-5	-1.42577E-2
e	5.39932E-6	4.43220E-7	4.06199E-6	1.86183E-7	1.50710E-6	-1.17038E-3
i	4.94829E-5	4.06199E-6	3.72503E-5	1.71769E-6	1.38115E-5	-1.07261E-2
Ω	2.26789E-6	1.86183E-7	1.71769E-6	8.38610E-8	6.32190E-7	-4.91598E-4
ω	1.83589E-5	1.50710E-6	1.38115E-5	6.32190E-7	5.13899E-6	-3.97957E-3
M	-1.42577E-2	-1.17038E-3	-1.07261E-2	-4.91598E-4	-3.97957E-3	3.09056E0

Date of computation: 2025-11-24 16:53 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

26.983

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

11 - 24*

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

Unit

Source

[1]

Unobserved

Value

1458

Unit

Source

[1]

Normalized RMS of residuals

Value

0.755253

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-11-28.309559

Unit

Source

[2]

Last Observation

Value

2021-11-29.90277

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (1)

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 2021WY2 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
MERCURY	1952-04-02 06:50	> 1 mo	0.0324706	0.0074741	25.1656569
EARTH	1959-12-01 12:18	> 1 mo	0.0058016	0.0053362	0.2339350
MERCURY	1979-06-25 16:51	> 1 mo	0.0119991	0.0058407	0.1155126
EARTH	2021-11-29 23:42	< 1 s	0.0063706	0.0063532	0.0000058
MERCURY	2029-10-28 12:07	> 1 mo	0.0185747	0.0004719	0.1222141
VENUS	2037-08-31 05:30	> 1 w	0.0259089	0.0171818	0.3502997
EARTH	2045-07-12 02:14	> 1 w	0.1759411	0.0592628	0.2504550
EARTH	2068-11-28 09:51	> 1 w	0.0934030	0.0139455	0.2870078
VENUS	2077-01-11 09:21	> 1 w	0.0205144	0.0179521	0.2048007
EARTH	2120-12-02 05:42	> 1 mo	0.1175507	0.0223753	1.4844294
EARTH	2124-12-12 19:23	> 1 mo	0.0943064	0.0235187	0.6592113

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
316.08307286	326.20478148	0.00685150	MINIMUM
44.85467910	179.91865145	0.05902005	MINIMUM
1.24672605	74.27375281	0.58723582	SADDLE
1.37628274	254.68198598	1.41390586	SADDLE
180.09957400	252.53861319	3.53356485	SADDLE
180.14942548	72.55174114	5.52533103	MAXIMUM

Download:

MOID Plots

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