Asteroids

2021LD6 help

Last update: 2024-04-23 14:44 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.890

Aphelion (Q)

1.087

Eccentricity (e)

0.100

Inclination (i)

0.8

deg

Orbit period (P)

359.0

Earth MOID

0.00070

U parameter

3.0

Next Earth close approach

Date

2073-01-26

Nominal distance (from Earth center)

0.11836

17706864

Maximum Brightness

25.6

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

27.1

mag

Diameter

10 - 22*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-06-12

Observatory

Pan-STARRS 1, Haleakala

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

0.988469

1-sigma variation

3.062E-7

Unit

Eccentricity (e)

Value

0.099918

1-sigma variation

0.000005

Unit

Inclination (i)

Value

0.7665

1-sigma variation

4.358E-5

Unit

Long. of Ascending Node (Ω)

Value

100.6552

1-sigma variation

4.499E-5

Unit

Arg. of Perihelion (ω)

Value

288.7044

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

184.54220

1-sigma variation

0.00153

Unit

Perihelion distance

Value

0.889704

1-sigma variation

Unit

Aphelion distance

Value

1.087235

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.034904

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.005145

1-sigma variation

Unit

MOID

Value

0.000698

1-sigma variation

Unit

Orbit Period

Value

358.9577

1-sigma variation

Unit

U parameter

Value

3.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.37644E-14	-1.64625E-12	-1.30698E-11	1.25575E-11	8.87074E-11	-4.63569E-10
e	-1.64625E-12	3.00205E-11	2.38639E-10	-2.31763E-10	-1.65809E-9	8.37402E-9
i	-1.30698E-11	2.38639E-10	1.89922E-9	-1.85449E-9	-1.31796E-8	6.65461E-8
Ω	1.25575E-11	-2.31763E-10	-1.85449E-9	2.02411E-9	1.26687E-8	-6.44588E-8
ω	8.87074E-11	-1.65809E-9	-1.31796E-8	1.26687E-8	9.32220E-8	-4.59746E-7
M	-4.63569E-10	8.37402E-9	6.65461E-8	-6.44588E-8	-4.59746E-7	2.34133E-6

Date of computation: 2024-04-23 10:08 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

27.12

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

10 - 22*

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

1019

Unit

Source

[1]

Normalized RMS of residuals

Value

0.705817

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-06-02.420884

Unit

Source

[2]

Last Observation

Value

2021-07-09.987754

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

41 (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

[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 2021LD6 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	1961-06-26 07:00	> 1 mo	0.1880963	0.0044227	1.8911654
EARTH	1962-06-30 00:06	> 1 mo	0.1107909	0.0027302	1.7588361
EARTH	1963-07-02 23:31	> 1 mo	0.0411812	0.0015725	1.4305418
EARTH	1964-07-03 02:25	> 1 d	0.0011693	0.0007051	0.0245334
EARTH	1965-01-10 00:47	> 1 mo	0.1426542	0.0866594	0.0191836
EARTH	1975-07-01 22:18	56.0	0.0008907	0.0005408	0.0002515
EARTH	1976-06-27 01:29	14.2	0.1241474	0.1229767	0.0003902
EARTH	2017-02-02 10:54	< 1 min	0.1780716	0.1780655	0.0000020
EARTH	2018-01-28 10:14	1.0	0.0474785	0.0474519	0.0000089
EARTH	2019-01-03 01:58	25.3	0.0625367	0.0624977	0.0000130
EARTH	2019-02-21 17:04	18.4	0.0570954	0.0570634	0.0000107
EARTH	2019-10-30 20:32	16.2	0.1061262	0.1061066	0.0000065
EARTH	2020-04-21 20:23	8.6	0.0830675	0.0830534	0.0000047
EARTH	2020-09-12 21:23	8.5	0.1002837	0.1002706	0.0000044
EARTH	2021-06-28 14:55	< 1 min	0.0270646	0.0270601	0.0000015
EARTH	2022-06-28 11:14	< 1 min	0.0577741	0.0577625	0.0000039
EARTH	2023-06-24 15:39	< 1 min	0.1595515	0.1595303	0.0000070
EARTH	2073-01-26 20:07	6.0	0.1183631	0.1179192	0.0001480
EARTH	2074-01-23 02:16	5.4	0.0168407	0.0164553	0.0001286
EARTH	2075-01-22 01:41	13.9	0.0158990	0.0147065	0.0003990
EARTH	2075-11-29 02:25	738.2	0.0838912	0.0833381	0.0001844
EARTH	2076-03-09 22:22	631.0	0.0759554	0.0757041	0.0000838
EARTH	2076-10-19 21:34	> 1 d	0.1045333	0.1040761	0.0001524
EARTH	2077-04-18 16:28	> 1 d	0.0859079	0.0853565	0.0001840
EARTH	2077-09-13 19:26	> 1 d	0.0995121	0.0988233	0.0002297
EARTH	2078-06-04 16:19	> 1 d	0.0568654	0.0526413	0.0014086
EARTH	2079-06-27 17:19	171.8	0.0145715	0.0080423	0.0021766
EARTH	2080-06-21 21:40	154.2	0.1679212	0.1391674	0.0095846
EARTH	2114-02-01 10:18	> 1 w	0.1375575	0.0062304	0.4095951
EARTH	2115-01-29 10:12	> 1 mo	0.0197196	0.0058779	0.3704945
EARTH	2115-10-21 10:27	> 1 mo	0.1161196	0.0273566	0.1026938
EARTH	2116-05-15 04:36	> 1 mo	0.0626461	0.0085555	0.3194484
EARTH	2116-07-28 14:46	> 1 mo	0.0764574	0.0121365	0.4279654
EARTH	2117-06-19 14:37	> 1 mo	0.1060370	0.0009900	1.3064764

Download as:

2021LD6

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2106-06-23.459	90433.459	3.506	3.45 ± 0.048	6.98E3	6.93E-7	2.67E-8	-7.68
2106-06-24.362	90434.362	3.518	3.00 ± 0.078	3.68E3	1.67E-6	6.43E-8	-7.30
2107-06-25.937	90800.937	3.239	2.87 ± 0.004	9.43E3	1.46E-6	5.64E-8	-7.36
2108-06-19.842	91160.842	3.171	3.99 ± 0.013	1.27E6	1.05E-8	4.07E-10	-9.51
2108-06-23.490	91164.490	3.227	2.33 ± 0.027	5.34E5	3.08E-8	1.19E-9	-9.04
2108-06-25.582	91166.582	2.935	1.58 ± 0.007	1.56E4	2.56E-6	9.88E-8	-7.12
2109-06-24.188	91530.188	2.923	1.33 ± 0.001	4.26E5	9.88E-8	3.81E-9	-8.54
2110-06-24.911	91895.911	2.615	3.19 ± 0.000	4.04E5	1.81E-7	6.96E-9	-8.29
2119-06-24.903	95182.903	3.538	1.85 ± 0.002	4.56E6	1.20E-9	4.61E-11	-10.51
2120-06-23.138	95547.138	3.237	2.32 ± 0.032	1.46E8	9.54E-11	3.68E-12	-11.61
2120-06-24.577	95548.577	2.637	3.98 ± 0.000	8.44E6	9.88E-10	3.81E-11	-10.59
2121-12-17.709	96089.709	-0.106	3.46 ± 0.001	3.30E7	4.85E-8	1.87E-9	-8.92


Based on 41 optical observations (of which 0 are rejected as outliers) from 2021/06/02.421 to 2021/07/09.988.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 4.00 and 4.00 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20240110 090430.982 UTC.

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