Asteroids

2020OB help

Last update: 2024-04-25 01:36 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.485

Aphelion (Q)

2.787

Eccentricity (e)

0.703

Inclination (i)

25.7

deg

Orbit period (P)

764.4

Earth MOID

0.01186

U parameter

9.0

Next Earth close approach

Date

2043-07-25

Nominal distance (from Earth center)

0.05571

8333620

Maximum Brightness

20.3

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

23.6

mag

Diameter

50 - 110*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-07-16

Observatory

Mt. Lemmon Survey

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

1.636118

1-sigma variation

0.011668

Unit

Eccentricity (e)

Value

0.703456

1-sigma variation

0.002452

Unit

Inclination (i)

Value

25.7026

1-sigma variation

0.0936

Unit

Long. of Ascending Node (Ω)

Value

120.8718

1-sigma variation

0.0089

Unit

Arg. of Perihelion (ω)

Value

283.6129

1-sigma variation

0.0758

Unit

Mean Anomaly (M)

Value

252.83460

1-sigma variation

6.50126

Unit

Perihelion distance

Value

0.485181

1-sigma variation

Unit

Aphelion distance

Value

2.787054

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.274524

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.025128

1-sigma variation

Unit

MOID

Value

0.011864

1-sigma variation

Unit

Orbit Period

Value

764.3994

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.36133E-4	2.86106E-5	1.09173E-3	1.04248E-4	-8.84338E-4	-7.58542E-2
e	2.86106E-5	6.01298E-6	2.29445E-4	2.19093E-5	-1.85855E-4	-1.59420E-2
i	1.09173E-3	2.29445E-4	8.75534E-3	8.36009E-4	-7.09173E-3	-6.08316E-1
Ω	1.04248E-4	2.19093E-5	8.36009E-4	7.98318E-5	-6.77222E-4	-5.80875E-2
ω	-8.84338E-4	-1.85855E-4	-7.09173E-3	-6.77222E-4	5.74519E-3	4.92758E-1
M	-7.58542E-2	-1.59420E-2	-6.08316E-1	-5.80875E-2	4.92758E-1	4.22664E1

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

23.64

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

50 - 110*

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

1376

Unit

Source

[1]

Normalized RMS of residuals

Value

0.653707

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-07-14.477491

Unit

Source

[2]

Last Observation

Value

2020-07-19.417372

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

29 (1)

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 2020OB 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	1953-07-26 22:08	> 1 mo	0.0943232	0.0221509	1.4526148
EARTH	1960-02-03 14:27	> 1 mo	0.1788281	0.1626283	0.7759566
EARTH	1976-07-29 23:27	> 1 mo	0.1614500	0.0221358	2.1558769
EARTH	1983-02-09 08:59	> 1 mo	0.1636906	0.1628968	0.1974907
EARTH	2020-07-20 02:29	< 1 min	0.0484940	0.0479638	0.0001767
EARTH	2043-07-25 15:28	> 1 mo	0.0557068	0.0094270	1.4049459
EARTH	2050-02-02 20:48	> 1 mo	0.1843569	0.1702274	0.4861235
EARTH	2073-02-11 18:31	> 1 w	0.1838891	0.1703041	0.1249969
EARTH	2110-07-15 04:18	> 1 mo	0.1858532	0.0057292	1.0234303

Download as:

2020OB

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2114-07-23.839	93385.839	1.839	1.01 ± 0.004	1.41E6	9.31E-8	2.92E-6	-6.27
2116-07-23.401	94116.401	-0.403	0.50 ± 0.003	8.40E4	9.56E-6	2.76E-4	-4.30
2116-07-23.402	94116.402	-0.403	0.70 ± 0.021	8.78E4	9.02E-6	2.61E-4	-4.32
2121-07-23.664	95942.664	-1.464	0.94 ± 0.010	8.86E5	1.74E-7	4.83E-6	-6.07


Based on 29 optical observations (of which 1 are rejected as outliers) from 2020/07/14.477 to 2020/07/19.417.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.09 and 1.09 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20240110 090430.818 UTC.

Download this part as:

Download Impactor Table as: