Asteroids

2021SJ3 help

Last update: 2025-04-30 08:15 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Amor

Perihelion (q)

1.084

Aphelion (Q)

1.415

Eccentricity (e)

0.132

Inclination (i)

2.4

deg

Orbit period (P)

510.2

Earth MOID

0.08392

U parameter

7.3

Next Earth close approach

Date

2028-10-11

Nominal distance (from Earth center)

0.14101

21094815

Maximum Brightness

23.7

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

15 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-29

Observatory

Pan-STARRS 1, Haleakala

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

1.249524

1-sigma variation

0.000354

Unit

Eccentricity (e)

Value

0.132132

1-sigma variation

0.000171

Unit

Inclination (i)

Value

2.4112

1-sigma variation

0.0030

Unit

Long. of Ascending Node (Ω)

Value

213.3229

1-sigma variation

0.0052

Unit

Arg. of Perihelion (ω)

Value

133.6615

1-sigma variation

0.0198

Unit

Mean Anomaly (M)

Value

221.88977

1-sigma variation

0.39587

Unit

Perihelion distance

Value

1.084422

1-sigma variation

Unit

Aphelion distance

Value

1.414625

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.345214

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.131295

1-sigma variation

Unit

MOID

Value

0.083921

1-sigma variation

Unit

Orbit Period

Value

510.1703

1-sigma variation

Unit

U parameter

Value

7.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.25422E-7	6.03668E-8	1.05192E-6	-1.13837E-6	-8.58033E-7	-1.40136E-4
e	6.03668E-8	2.92361E-8	5.00322E-7	-4.94008E-7	-6.77174E-7	-6.72932E-5
i	1.05192E-6	5.00322E-7	9.02175E-6	-1.13472E-5	1.54304E-6	-1.18048E-3
Ω	-1.13837E-6	-4.94008E-7	-1.13472E-5	2.66218E-5	-7.12346E-5	1.31845E-3
ω	-8.58033E-7	-6.77174E-7	1.54304E-6	-7.12346E-5	3.92721E-4	7.30413E-4
M	-1.40136E-4	-6.72932E-5	-1.18048E-3	1.31845E-3	7.30413E-4	1.56712E-1

Date of computation: 2025-02-19 13:28 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

26.299

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

15 - 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

1299

Unit

Source

[1]

Normalized RMS of residuals

Value

0.36738

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-29.297064

Unit

Source

[2]

Last Observation

Value

2021-10-09.232254

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

21 (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 2021SJ3 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	1954-09-12 01:33	> 1 mo	0.0867932	0.0818304	0.0194619
EARTH	1961-10-09 16:03	> 1 mo	0.1387672	0.1072093	0.0622626
EARTH	2007-07-17 19:13	> 1 mo	0.1647723	0.1049521	0.0252147
EARTH	2014-08-28 21:58	> 1 w	0.0967545	0.0791322	0.0086260
EARTH	2021-09-13 08:25	163.8	0.0870320	0.0867082	0.0001079
EARTH	2028-10-11 16:35	> 1 mo	0.1410101	0.1142129	0.0118003
EARTH	2074-07-20 03:56	> 1 mo	0.1629829	0.0907854	0.0489055
EARTH	2081-08-30 16:26	> 1 mo	0.0955705	0.0777712	0.0322291
EARTH	2088-09-14 16:18	> 1 mo	0.0871007	0.0814652	0.0220237
EARTH	2095-10-13 08:05	> 1 mo	0.1414310	0.1087492	0.0895453

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
358.81131685	244.63691295	0.08415990	MINIMUM
174.69442470	59.93690690	0.42449184	SADDLE
354.07560494	59.17544636	2.07587977	SADDLE
175.60006978	240.71579686	2.42155071	MAXIMUM

Download:

MOID Plots

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