Asteroids

2020JJ help

Last update: 2025-07-29 02:36 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.871

Aphelion (Q)

2.142

Eccentricity (e)

0.422

Inclination (i)

11.2

deg

Orbit period (P)

675.4

Earth MOID

0.00026

U parameter

7.9

Next Earth close approach

Date

2031-09-11

Nominal distance (from Earth center)

0.1774

26538333

Maximum Brightness

28.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

29.9

mag

Diameter

2.8 - 6*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-05-04

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.506491

1-sigma variation

0.001148

Unit

Eccentricity (e)

Value

0.422068

1-sigma variation

0.000434

Unit

Inclination (i)

Value

11.1889

1-sigma variation

0.0094

Unit

Long. of Ascending Node (Ω)

Value

44.1320

1-sigma variation

0.0006

Unit

Arg. of Perihelion (ω)

Value

237.4188

1-sigma variation

0.0213

Unit

Mean Anomaly (M)

Value

230.04393

1-sigma variation

1.02949

Unit

Perihelion distance

Value

0.870650

1-sigma variation

Unit

Aphelion distance

Value

2.142332

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.610977

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.000491

1-sigma variation

Unit

MOID

Value

0.000265

1-sigma variation

Unit

Orbit Period

Value

675.3801

1-sigma variation

Unit

U parameter

Value

7.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.31749E-6	4.97903E-7	1.07837E-5	-7.29463E-7	-2.41938E-5	-1.18166E-3
e	4.97903E-7	1.88295E-7	4.07579E-6	-2.75868E-7	-9.10627E-6	-4.46584E-4
i	1.07837E-5	4.07579E-6	8.86061E-5	-5.96939E-6	-1.97900E-4	-9.67197E-3
Ω	-7.29463E-7	-2.75868E-7	-5.96939E-6	4.04230E-7	1.33405E-5	6.54276E-4
ω	-2.41938E-5	-9.10627E-6	-1.97900E-4	1.33405E-5	4.55009E-4	2.16966E-2
M	-1.18166E-3	-4.46584E-4	-9.67197E-3	6.54276E-4	2.16966E-2	1.05984E0

Date of computation: 2025-07-29 02:36 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

29.924

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

2.8 - 6*

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

0.1

Unit

Source

[1]

Unobserved

Value

1946

Unit

Source

[1]

Normalized RMS of residuals

Value

0.467553

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-05-04.24529

Unit

Source

[2]

Last Observation

Value

2020-05-04.331703

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (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 2020JJ 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	1958-06-01 21:02	> 1 mo	0.1406464	0.0636201	0.1487330
EARTH	1985-04-20 23:20	> 1 w	0.1412380	0.0153225	0.2546550
EARTH	2020-05-04 12:03	< 1 min	0.0000896	0.0000895	0.0000000
EARTH	2031-09-11 20:40	> 1 d	0.1773978	0.1740718	0.0161050
EARTH	2057-05-12 21:10	> 1 mo	0.0706830	0.0027664	0.2676934
EARTH	2070-04-29 07:05	> 1 d	0.0776015	0.0002984	0.0635306
EARTH	2081-09-14 00:49	> 1 w	0.1861864	0.1724861	0.0723204
EARTH	2107-06-04 19:45	> 1 mo	0.1629006	0.0552823	0.5061721
EARTH	2120-05-03 17:41	> 1 mo	0.0266876	0.0029488	0.8991346

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
321.54479410	121.15099948	0.00026452	MINIMUM
43.52850405	244.74824485	0.17462395	MINIMUM
10.34957516	195.47768083	0.22238216	SADDLE
181.75761335	359.94526046	1.18323744	SADDLE
1.08510812	0.54156404	1.84793912	SADDLE
179.33307562	178.39930721	3.14938111	MAXIMUM

Download:

MOID Plots

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