Asteroids

2021LW3 help

Last update: 2024-04-16 14:31 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.575

Aphelion (Q)

1.073

Eccentricity (e)

0.302

Inclination (i)

16.4

deg

Orbit period (P)

273.4

Earth MOID

0.01181

U parameter

6.7

Next Earth close approach

Date

2024-06-06

Nominal distance (from Earth center)

0.02455

3672436

Maximum Brightness

18.4

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

70 - 150*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-06-09

Observatory

ATLAS-MLO, Mauna Loa

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.824348

1-sigma variation

0.000048

Unit

Eccentricity (e)

Value

0.302065

1-sigma variation

0.000153

Unit

Inclination (i)

Value

16.4121

1-sigma variation

0.0139

Unit

Long. of Ascending Node (Ω)

Value

254.4894

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

213.8757

1-sigma variation

0.0055

Unit

Mean Anomaly (M)

Value

37.87367

1-sigma variation

0.09408

Unit

Perihelion distance

Value

0.575342

1-sigma variation

Unit

Aphelion distance

Value

1.073355

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.014758

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.385587

1-sigma variation

Unit

MOID

Value

0.011806

1-sigma variation

Unit

Orbit Period

Value

273.3786

1-sigma variation

Unit

U parameter

Value

6.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.26583E-9	-7.30183E-9	-6.63942E-7	1.67409E-8	-2.60276E-7	-4.47811E-6
e	-7.30183E-9	2.35315E-8	2.13969E-6	-5.39692E-8	8.38875E-7	1.44309E-5
i	-6.63942E-7	2.13969E-6	1.94560E-4	-4.90754E-6	7.62794E-5	1.31217E-3
Ω	1.67409E-8	-5.39692E-8	-4.90754E-6	1.24529E-7	-1.92650E-6	-3.30799E-5
ω	-2.60276E-7	8.38875E-7	7.62794E-5	-1.92650E-6	2.99163E-5	5.14365E-4
M	-4.47811E-6	1.44309E-5	1.31217E-3	-3.30799E-5	5.14365E-4	8.85044E-3

Date of computation: 2024-02-21 14:29 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

22.969

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

70 - 150*

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 ODIM	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

1018

Unit

Source

[1]

Normalized RMS of residuals

Value

0.626547

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-06-09.252607

Unit

Source

[2]

Last Observation

Value

2021-07-03.93442

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

96 (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 2021LW3 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1959-06-08 06:54	1355.8	0.1591388	0.0257720	0.0445147
EARTH	1962-06-06 19:38	717.1	0.0919373	0.0074112	0.0414926
EARTH	1965-06-06 06:48	216.8	0.0336726	0.0105662	0.0336695
EARTH	1968-06-06 11:21	365.7	0.0130532	0.0112308	0.0063348
EARTH	1971-06-09 10:14	1103.9	0.0653182	0.0264670	0.0130311
EARTH	1974-06-14 18:02	> 1 d	0.1258049	0.0908007	0.0117260
EARTH	1977-06-24 02:05	> 1 d	0.1832069	0.1545080	0.0097669
EARTH	2015-06-08 08:21	87.3	0.1557595	0.1476821	0.0026925
EARTH	2018-06-06 18:20	23.3	0.0792882	0.0750510	0.0014128
EARTH	2021-06-06 11:47	< 1 min	0.0170209	0.0169822	0.0000129
EARTH	2024-06-06 21:02	54.4	0.0245487	0.0209130	0.0012406
EARTH	2027-06-10 02:30	170.7	0.0752181	0.0693836	0.0019451
EARTH	2030-06-15 06:31	330.8	0.1301224	0.1235202	0.0022023
EARTH	2033-06-24 03:04	465.0	0.1826078	0.1758972	0.0022443
EARTH	2074-06-08 08:08	178.1	0.1603517	0.1428173	0.0058451
EARTH	2077-06-06 17:59	97.4	0.0910388	0.0741323	0.0056411
EARTH	2080-06-06 04:27	30.8	0.0313369	0.0185294	0.0045471
EARTH	2083-06-07 08:60	50.9	0.0155986	0.0129229	0.0011144
EARTH	2086-06-09 12:40	23.6	0.0697091	0.0695717	0.0000458
EARTH	2089-06-15 04:44	315.5	0.1307152	0.1259295	0.0015962
EARTH	2092-06-25 03:50	721.1	0.1877011	0.1798486	0.0026335

Download as: