Asteroids

2021LC1 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.516

Aphelion (Q)

1.389

Eccentricity (e)

0.458

Inclination (i)

14.8

deg

Orbit period (P)

339.7

Earth MOID

0.00371

U parameter

6.2

Next Earth close approach

Date

2034-06-07

Nominal distance (from Earth center)

0.13122

19630456

Maximum Brightness

24.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.4

mag

Diameter

14 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-06-04

Observatory

Palomar Mountain--ZTF

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

0.952847

1-sigma variation

0.000032

Unit

Eccentricity (e)

Value

0.458046

1-sigma variation

0.000059

Unit

Inclination (i)

Value

14.7566

1-sigma variation

0.0027

Unit

Long. of Ascending Node (Ω)

Value

75.2375

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

303.5184

1-sigma variation

0.0013

Unit

Mean Anomaly (M)

Value

214.77954

1-sigma variation

0.07807

Unit

Perihelion distance

Value

0.516399

1-sigma variation

Unit

Aphelion distance

Value

1.389295

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.384354

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.008374

1-sigma variation

Unit

MOID

Value

0.003708

1-sigma variation

Unit

Orbit Period

Value

339.7294

1-sigma variation

Unit

U parameter

Value

6.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.00834E-9	1.85506E-9	8.42300E-8	-1.64945E-9	-3.94492E-8	-2.47905E-6
e	1.85506E-9	3.45849E-9	1.56429E-7	-3.08331E-9	-7.05253E-8	-4.55717E-6
i	8.42300E-8	1.56429E-7	7.08596E-6	-1.39533E-7	-3.22924E-6	-2.06968E-4
Ω	-1.64945E-9	-3.08331E-9	-1.39533E-7	2.76362E-9	6.23295E-8	4.05141E-6
ω	-3.94492E-8	-7.05253E-8	-3.22924E-6	6.23295E-8	1.63537E-6	9.71485E-5
M	-2.47905E-6	-4.55717E-6	-2.06968E-4	4.05141E-6	9.71485E-5	6.09513E-3

Date of computation: 2025-09-10 00:30 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

26.36

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

14 - 30*

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

1564

Unit

Source

[1]

Normalized RMS of residuals

Value

0.648051

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-06-04.23461

Unit

Source

[2]

Last Observation

Value

2021-06-05.410923

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

45 (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 2021LC1 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	1958-06-04 16:33	> 1 d	0.0275975	0.0042459	0.0568881
EARTH	1983-06-06 09:08	297.9	0.0228579	0.0036135	0.0091040
EARTH	1996-06-02 00:06	328.1	0.1005852	0.0807553	0.0066108
EARTH	2008-06-05 18:05	179.1	0.1638057	0.1526083	0.0037326
EARTH	2021-06-05 12:27	< 1 s	0.0076324	0.0076290	0.0000012
EARTH	2034-06-07 04:29	59.5	0.1312215	0.1201674	0.0036847
EARTH	2048-05-31 17:18	342.8	0.1402185	0.1201313	0.0066959
EARTH	2061-06-04 18:47	363.2	0.0274408	0.0027840	0.0085004
EARTH	2074-06-06 11:26	475.0	0.0253073	0.0017235	0.0152266
EARTH	2087-06-06 19:11	711.4	0.1636441	0.1168281	0.0156088
EARTH	2101-06-02 20:21	> 1 d	0.1209656	0.0010056	0.0511085
EARTH	2114-06-07 09:10	> 1 d	0.0146708	0.0008534	0.0798686

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
262.05899773	152.00179612	0.00285455	MINIMUM
83.30342283	26.29062663	0.21395262	MINIMUM
171.29033596	91.32329605	0.46698061	SADDLE
350.99369559	264.23974095	0.51109354	SADDLE
354.50008959	90.10574226	1.50868892	SADDLE
180.12964986	276.81384163	2.37383383	MAXIMUM

Download:

MOID Plots

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