Asteroids

2021TN3 help

Last update: 2025-04-09 07:59 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Aten

Perihelion (q)

0.795

Aphelion (Q)

1.182

Eccentricity (e)

0.196

Inclination (i)

4.2

deg

Orbit period (P)

359.1

Earth MOID

0.04061

U parameter

1.9

Next Earth close approach

Date

2077-06-22

Nominal distance (from Earth center)

0.16473

24643777

Maximum Brightness

24.5

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.2

mag

Diameter

24 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-10-03

Observatory

Pan-STARRS 2, 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

0.988647

1-sigma variation

6.435E-8

Unit

Eccentricity (e)

Value

0.195907

1-sigma variation

0.000001

Unit

Inclination (i)

Value

4.1777

1-sigma variation

2.889E-5

Unit

Long. of Ascending Node (Ω)

Value

20.4569

1-sigma variation

1.726E-5

Unit

Arg. of Perihelion (ω)

Value

137.2260

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

95.97896

1-sigma variation

0.00009

Unit

Perihelion distance

Value

0.794964

1-sigma variation

Unit

Aphelion distance

Value

1.182330

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.113034

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.170886

1-sigma variation

Unit

MOID

Value

0.040614

1-sigma variation

Unit

Orbit Period

Value

359.0545

1-sigma variation

Unit

U parameter

Value

1.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.14146E-15	-6.80946E-14	-1.81052E-12	-1.94697E-13	-6.12699E-12	-5.43233E-12
e	-6.80946E-14	1.14256E-12	2.98758E-11	3.75251E-12	9.86296E-11	9.35862E-11
i	-1.81052E-12	2.98758E-11	8.34533E-10	5.72050E-11	2.74590E-9	2.34361E-9
Ω	-1.94697E-13	3.75251E-12	5.72050E-11	2.97858E-10	-9.26838E-11	4.18243E-10
ω	-6.12699E-12	9.86296E-11	2.74590E-9	-9.26838E-11	9.87285E-9	7.30650E-9
M	-5.43233E-12	9.35862E-11	2.34361E-9	4.18243E-10	7.30650E-9	8.25686E-9

Date of computation: 2025-04-09 07:59 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

25.195

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

24 - 50*

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
No.[1]	NameESA Aegis	AdditionalESA orbit determination and impact monitoring system
No.[2]	NameEstimation	AdditionalEstimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

768

Unit

Source

[1]

Unobserved

Value

559

Unit

Source

[1]

Normalized RMS of residuals

Value

0.641136

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-10-02.470382

Unit

Source

[2]

Last Observation

Value

2023-11-09.40091

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

35 (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 2021TN3 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	1957-06-22 01:13	1.9	0.1655204	0.1654364	0.0000280
EARTH	1958-06-17 10:16	2.2	0.0884723	0.0884155	0.0000189
EARTH	1959-06-11 08:33	3.5	0.0736494	0.0736193	0.0000100
EARTH	1960-05-12 01:51	21.7	0.1289599	0.1289201	0.0000133
EARTH	1960-07-07 09:22	21.3	0.1372176	0.1371744	0.0000144
EARTH	1961-04-14 07:03	23.9	0.1688182	0.1687983	0.0000066
EARTH	1961-08-08 07:59	18.8	0.1723285	0.1723152	0.0000044
EARTH	1962-03-23 02:37	22.6	0.1910099	0.1910029	0.0000023
EARTH	1962-08-29 18:17	16.4	0.1829010	0.1828984	0.0000009
EARTH	1963-03-02 18:09	21.9	0.1993023	0.1992995	0.0000009
EARTH	1963-09-18 11:00	15.0	0.1743546	0.1743396	0.0000050
EARTH	1964-02-09 18:49	21.9	0.1941208	0.1941083	0.0000042
EARTH	1964-10-08 07:34	13.9	0.1464664	0.1464393	0.0000090
EARTH	1965-01-15 02:49	23.1	0.1717582	0.1717331	0.0000083
EARTH	1965-11-02 16:34	8.9	0.0937911	0.0937500	0.0000137
EARTH	1966-11-15 13:39	< 1 min	0.0401547	0.0401524	0.0000008
EARTH	1967-11-14 07:09	< 1 min	0.1086807	0.1086320	0.0000162
EARTH	2015-06-20 10:06	< 1 min	0.1216656	0.1216602	0.0000018
EARTH	2016-06-13 21:30	< 1 min	0.0668693	0.0668677	0.0000005
EARTH	2017-05-22 01:36	< 1 min	0.1160927	0.1160915	0.0000004
EARTH	2018-04-18 11:04	1.1	0.1642459	0.1642436	0.0000007
EARTH	2018-08-05 09:03	< 1 min	0.1677458	0.1677434	0.0000008
EARTH	2019-03-25 09:52	1.1	0.1896504	0.1896474	0.0000010
EARTH	2019-08-28 15:14	< 1 min	0.1812913	0.1812883	0.0000010
EARTH	2020-03-02 17:17	< 1 min	0.1992591	0.1992556	0.0000011
EARTH	2020-09-17 14:56	< 1 min	0.1731032	0.1731000	0.0000011
EARTH	2021-02-08 10:45	< 1 min	0.1938084	0.1938048	0.0000012
EARTH	2021-10-10 00:36	< 1 min	0.1427799	0.1427770	0.0000010
EARTH	2022-01-12 18:33	< 1 min	0.1686948	0.1686914	0.0000011
EARTH	2022-11-06 03:51	< 1 min	0.0850692	0.0850672	0.0000007
EARTH	2023-11-15 22:01	< 1 min	0.0436275	0.0436266	0.0000003
EARTH	2024-11-12 22:53	< 1 min	0.1254672	0.1254649	0.0000008
EARTH	2077-06-22 20:12	10.4	0.1647335	0.1641668	0.0001890
EARTH	2078-06-19 00:34	12.5	0.0964814	0.0960431	0.0001464
EARTH	2079-06-14 14:55	17.3	0.0672042	0.0671399	0.0000223
EARTH	2080-05-30 18:21	95.3	0.1053116	0.1048790	0.0001444
EARTH	2081-04-29 20:00	201.1	0.1497127	0.1494241	0.0000963
EARTH	2081-07-24 01:44	183.5	0.1564540	0.1561876	0.0000888
EARTH	2082-04-09 05:39	208.0	0.1768376	0.1766536	0.0000614
EARTH	2082-08-13 16:49	173.7	0.1786464	0.1785246	0.0000406
EARTH	2083-03-22 13:46	211.9	0.1927211	0.1926191	0.0000340
EARTH	2083-08-30 11:59	168.4	0.1860288	0.1860185	0.0000035
EARTH	2084-03-04 19:12	218.6	0.1994459	0.1994219	0.0000081
EARTH	2084-09-14 07:05	167.6	0.1811103	0.1810137	0.0000322
EARTH	2085-02-15 20:21	229.7	0.1971904	0.1971303	0.0000200
EARTH	2085-09-30 13:00	169.1	0.1638397	0.1636239	0.0000720
EARTH	2086-01-28 10:16	250.7	0.1845904	0.1844232	0.0000558
EARTH	2086-10-18 17:12	163.4	0.1326374	0.1322718	0.0001220
EARTH	2087-01-04 08:55	290.6	0.1572400	0.1568783	0.0001206
EARTH	2087-11-08 23:58	88.9	0.0841290	0.0836014	0.0001762
EARTH	2088-11-16 07:59	6.3	0.0427487	0.0427077	0.0000155
EARTH	2089-11-15 17:53	8.8	0.0845740	0.0838434	0.0002439
EARTH	2090-11-13 07:44	12.5	0.1609793	0.1600585	0.0003070

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
266.68829618	311.88182302	0.04089083	MINIMUM
93.80472177	160.36580360	0.06654675	MINIMUM
178.97752595	235.67741841	0.18203142	SADDLE
1.23797254	56.32555118	0.19955883	SADDLE
4.99094308	240.83065557	1.80330640	SADDLE
183.87639639	59.71237095	2.17264232	MAXIMUM

Download:

MOID Plots

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