Asteroids

2021OT help

Last update: 2024-04-19 23:53 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.696

Aphelion (Q)

1.294

Eccentricity (e)

0.300

Inclination (i)

16.5

deg

Orbit period (P)

362.5

Earth MOID

0.00857

U parameter

6.5

Next Earth close approach

Date

2024-07-17

Nominal distance (from Earth center)

0.12877

19264191

Maximum Brightness

24.4

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

2021-07-19

Observatory

ATLAS-HKO, 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

0.994919

1-sigma variation

0.000057

Unit

Eccentricity (e)

Value

0.300333

1-sigma variation

0.000114

Unit

Inclination (i)

Value

16.4944

1-sigma variation

0.0076

Unit

Long. of Ascending Node (Ω)

Value

117.1562

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

66.3764

1-sigma variation

0.0054

Unit

Mean Anomaly (M)

Value

337.16575

1-sigma variation

0.11348

Unit

Perihelion distance

Value

0.696112

1-sigma variation

Unit

Aphelion distance

Value

1.293726

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.175251

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.012899

1-sigma variation

Unit

MOID

Value

0.008566

1-sigma variation

Unit

Orbit Period

Value

362.4766

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.23795E-9	6.49607E-9	4.25636E-7	-3.85720E-9	3.05425E-7	-6.45706E-6
e	6.49607E-9	1.30837E-8	8.60350E-7	-7.70292E-9	6.10040E-7	-1.29574E-5
i	4.25636E-7	8.60350E-7	5.72020E-5	-5.00306E-7	3.97538E-5	-8.49107E-4
Ω	-3.85720E-9	-7.70292E-9	-5.00306E-7	4.63326E-9	-3.66007E-7	7.69023E-6
ω	3.05425E-7	6.10040E-7	3.97538E-5	-3.66007E-7	2.89607E-5	-6.08922E-4
M	-6.45706E-6	-1.29574E-5	-8.49107E-4	7.69023E-6	-6.08922E-4	1.28768E-2

Date of computation: 2024-02-21 14:29 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

26.315

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 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

1.0

Unit

Source

[1]

Unobserved

Value

1005

Unit

Source

[1]

Normalized RMS of residuals

Value

0.689781

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-07-19.413046

Unit

Source

[2]

Last Observation

Value

2021-07-20.381069

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

53 (3)

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 2021OT 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
VENUS	1953-10-13 01:30	978.1	0.0450602	0.0435722	0.0035836
VENUS	2015-04-20 17:36	189.6	0.0442546	0.0439414	0.0003021
EARTH	2017-07-23 18:13	86.6	0.1555856	0.1502310	0.0017850
EARTH	2018-07-22 08:49	68.7	0.1098958	0.1055641	0.0014441
EARTH	2019-07-21 03:23	48.1	0.0664061	0.0632172	0.0010635
EARTH	2020-07-19 03:30	25.3	0.0273826	0.0256005	0.0005964
EARTH	2021-07-18 14:04	< 1 s	0.0092872	0.0092754	0.0000039
EARTH	2022-07-18 00:10	15.7	0.0417291	0.0398844	0.0006156
EARTH	2023-07-17 17:43	7.2	0.0838497	0.0803401	0.0011702
EARTH	2024-07-17 02:40	39.5	0.1287732	0.1237858	0.0016628
EARTH	2025-07-19 00:25	153.9	0.1745370	0.1682691	0.0020900
EARTH	2041-01-16 19:38	> 1 d	0.1927332	0.1796596	0.0046783
EARTH	2042-01-10 01:15	> 1 d	0.1642201	0.1531507	0.0041664
EARTH	2043-01-04 05:22	> 1 d	0.1423063	0.1360411	0.0027901
EARTH	2043-12-30 06:60	1261.2	0.1325774	0.1324136	0.0004019
EARTH	2044-12-25 00:46	1106.0	0.1388021	0.1339897	0.0024742
EARTH	2045-12-21 04:48	987.2	0.1603076	0.1473474	0.0049958
EARTH	2046-12-17 10:16	858.9	0.1958978	0.1769096	0.0067417

Download as: