Asteroids

2021TH13 help

Last update: 2024-05-10 06:00 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.681

Aphelion (Q)

1.249

Eccentricity (e)

0.295

Inclination (i)

4.7

deg

Orbit period (P)

346.3

Earth MOID

0.00068

U parameter

5.4

Next Earth close approach

Date

2036-06-08

Nominal distance (from Earth center)

0.17836

26681573

Maximum Brightness

27.7

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

28.1

mag

Diameter

6 - 14*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-10-13

Observatory

Pan-STARRS 2, 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

0.965110

1-sigma variation

0.000010

Unit

Eccentricity (e)

Value

0.294519

1-sigma variation

0.000130

Unit

Inclination (i)

Value

4.7178

1-sigma variation

0.0025

Unit

Long. of Ascending Node (Ω)

Value

23.8518

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

113.4135

1-sigma variation

0.0033

Unit

Mean Anomaly (M)

Value

130.14158

1-sigma variation

0.00138

Unit

Perihelion distance

Value

0.680867

1-sigma variation

Unit

Aphelion distance

Value

1.249354

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.002488

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.213943

1-sigma variation

Unit

MOID

Value

0.000678

1-sigma variation

Unit

Orbit Period

Value

346.3092

1-sigma variation

Unit

U parameter

Value

5.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.03838E-10	1.31612E-9	2.49698E-8	-2.57257E-9	3.27378E-8	-8.78063E-9
e	1.31612E-9	1.68949E-8	3.20590E-7	-2.86961E-8	4.22675E-7	-9.57270E-8
i	2.49698E-8	3.20590E-7	6.08359E-6	-5.43344E-7	8.02132E-6	-1.81228E-6
Ω	-2.57257E-9	-2.86961E-8	-5.43344E-7	1.43929E-7	-6.68956E-7	4.92723E-7
ω	3.27378E-8	4.22675E-7	8.02132E-6	-6.68956E-7	1.06019E-5	-2.20501E-6
M	-8.78063E-9	-9.57270E-8	-1.81228E-6	4.92723E-7	-2.20501E-6	1.89070E-6

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

28.064

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

6 - 14*

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

[-]

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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

939

Unit

Source

[1]

Normalized RMS of residuals

Value

0.69848

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-10-06.581965

Unit

Source

[2]

Last Observation

Value

2021-10-14.01092

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

18 (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

[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 2021TH13 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	1960-06-04 10:27	25.1	0.0717304	0.0701693	0.0005498
EARTH	1962-10-18 02:09	27.4	0.0420517	0.0374139	0.0015459
VENUS	1962-12-30 21:36	1171.6	0.0485615	0.0485513	0.0000034
EARTH	1975-06-22 12:09	243.4	0.1698458	0.1690782	0.0002560
EARTH	1977-10-16 05:27	62.3	0.0652796	0.0610141	0.0014218
VENUS	1984-07-11 06:49	1075.0	0.0486086	0.0479667	0.0002420
EARTH	1989-06-07 10:55	59.6	0.0879148	0.0861001	0.0006121
EARTH	1991-10-02 19:42	326.3	0.1497370	0.1478303	0.0006357
EARTH	2004-06-04 15:06	75.9	0.0681748	0.0668085	0.0005454
VENUS	2006-02-06 16:20	> 1 d	0.0429831	0.0403043	0.0009321
EARTH	2006-10-16 18:53	187.6	0.0740242	0.0678868	0.0020458
EARTH	2019-06-05 01:40	54.3	0.1174901	0.1153241	0.0007245
EARTH	2021-10-17 19:19	< 1 min	0.0042351	0.0042289	0.0000021
VENUS	2023-11-04 21:39	18.2	0.0493053	0.0492347	0.0000239
VENUS	2036-04-15 11:49	323.6	0.0164294	0.0151447	0.0005054
EARTH	2036-06-08 06:48	55.1	0.1783553	0.1760342	0.0007741
EARTH	2037-06-05 20:41	390.7	0.1456791	0.1423871	0.0011005
EARTH	2039-09-28 01:13	1412.0	0.1691821	0.1624771	0.0022359
EARTH	2040-10-14 06:14	217.1	0.1167337	0.1051043	0.0038765
VENUS	2046-09-25 17:01	> 1 d	0.0178070	0.0149995	0.0029012
EARTH	2055-06-08 21:21	1281.8	0.1762040	0.1136974	0.0217606
EARTH	2056-06-09 13:39	> 1 d	0.1534082	0.0952033	0.0202486
VENUS	2057-02-04 07:00	> 1 w	0.0403937	0.0398709	0.0032728
EARTH	2058-10-04 20:28	> 1 w	0.1446092	0.0626574	0.0275966
EARTH	2059-10-12 22:59	> 1 d	0.1589008	0.0442553	0.0382160
EARTH	2074-06-04 05:17	> 1 d	0.0873193	0.0615163	0.0326113
EARTH	2077-10-17 18:01	1277.1	0.0540051	0.0017793	0.0361775
VENUS	2079-12-22 09:22	> 1 d	0.0275028	0.0153048	0.0177155
EARTH	2094-05-30 22:37	> 1 d	0.0784043	0.0605654	0.0978980
EARTH	2097-10-18 00:15	> 1 d	0.0014734	0.0012607	0.0950083
EARTH	2098-10-11 15:55	> 1 mo	0.1850499	0.0022258	14.4990388
VENUS	2099-01-01 03:45	> 1 mo	0.0223667	0.0148198	9.2580042
EARTH	2123-06-02 01:38	> 1 mo	0.0985184	0.0476960	107.0475279
VENUS	2124-02-17 23:14	> 1 mo	0.0333335	0.0297820	50.7825420
EARTH	2124-05-27 19:09	> 1 mo	0.1090451	0.0474801	107.6229713

Download as:

2021TH13

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2096-10-17.144	86898.144	2.041	1.48 ± 0.057	1.60E5	4.23E-7	6.64E-9	-8.16
2114-10-18.359	93472.359	1.843	0.63 ± 0.141	1.69E5	1.30E-6	2.04E-8	-7.77
2119-10-19.199	95299.199	2.857	1.47 ± 0.055	1.06E7	8.79E-10	1.38E-11	-10.96


Based on 18 optical observations (of which 0 are rejected as outliers) from 2021/10/06.582 to 2021/10/14.011.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.63 and 1.63 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20240110 090430.515 UTC.

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Download Impactor Table as: