Asteroids

2021TT4

Last update: 2021-11-30 01:34 UTC

Orbital Properties

Epoch

59600.0

MJD

Orbit type

Apollo

Perihelion (q)

0.933

Aphelion (Q)

1.14

Eccentricity (e)

0.099

Inclination (i)

3.3

deg

Orbit period (P)

385.4

days

Earth MOID

0.01179

Next Earth close approach

Date

2022-06-03

Nominal distance (from Earth center)

0.12921

19328802

Maximum Brightness

25.2

Orbit Visualiser

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Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

28.1

Diameter

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-10-04

Observatory

Pan-STARRS 1, Haleakala

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion
Aphelion
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period

Value

1-sigma variation

Unit

Epoch

Value

59600.0

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.04

1-sigma variation

2.15424E-5

Unit

Eccentricity (e)

Value

0.099401861476904

1-sigma variation

2.74055E-5

Unit

Inclination (i)

Value

3.33

1-sigma variation

1.233E-3

Unit

Ascending Node (Ω)

Value

192.56

1-sigma variation

1.031E-3

Unit

Arg. of Perihelion (ω)

Value

266.03

1-sigma variation

4.888E-3

Unit

Mean Anomaly (M)

Value

25.79

1-sigma variation

3.831E-3

Unit

Perihelion

Value

9.335E-1

1-sigma variation

Unit

Aphelion

Value

1.14

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

3.413E-2

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.045E-2

1-sigma variation

Unit

MOID

Value

1.179E-2

1-sigma variation

Unit

Orbit Period

Value

385.44

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.64073E-10	5.89077E-10	2.65479E-8	2.21812E-8	-1.04944E-7	8.23748E-8
e	5.89077E-10	7.51059E-10	3.37795E-8	2.82443E-8	-1.32474E-7	1.04145E-7
i	2.65479E-8	3.37795E-8	1.52087E-6	1.27115E-6	-5.98523E-6	4.70184E-6
Ω	2.21812E-8	2.82443E-8	1.27115E-6	1.06263E-6	-4.99620E-6	3.92592E-6
ω	-1.04944E-7	-1.32474E-7	-5.98523E-6	-4.99620E-6	2.38967E-5	-1.87221E-5
M	8.23748E-8	1.04145E-7	4.70184E-6	3.92592E-6	-1.87221E-5	1.46758E-5

Date of computation: 2021-11-10 06:02 UTC

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

28.148

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

Unit

Source

[-]

Diameter

Value

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

**Estimated value

Observational Information

Arc Length
Unobserved

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

days

Source

[1]

Unobserved

Value

Unit

days

Source

[1]

Astrometry Summary

RMS of Residuals
First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

RMS of Residuals

Value

1.0071

Unit

arcseconds

Source

[1]

First Observation

Value

2021-10-02.54483

Unit

Source

[2]

Last Observation

Value

2021-10-10.449325

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (2)

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 2021TT4 from 1950 to 2121

Body	Date	MJD	Nominal distance (au)	Min possible distance (au)	Stretching (au)	Width (au)	Close approach probability
EARTH	1954-10-09.94426	35024.9	0.0801368	0.0089899	3.832E-2	9.231E-8	1.00E0
EARTH	1955-06-15.46927	35273.5	0.1399965	0.1280340	7.170E-3	1.658E-6	1.00E0
EARTH	1956-03-15.77758	35547.8	0.1370367	0.0278514	3.752E-2	1.743E-7	7.84E-1
EARTH	1971-10-10.13610	41234.1	0.0853144	0.0094201	1.716E-2	1.411E-7	1.00E0
EARTH	1972-06-18.12430	41486.1	0.1400355	0.1359115	3.042E-3	1.985E-6	1.00E0
EARTH	1973-03-16.48567	41757.5	0.1240206	0.0525719	1.736E-2	1.833E-7	1.00E0
EARTH	1988-10-04.95306	47439.0	0.1761452	0.1689497	2.361E-3	3.230E-7	1.00E0
EARTH	1989-07-19.67812	47726.7	0.1367595	0.1345892	7.421E-4	7.147E-7	1.00E0
EARTH	1990-03-13.91562	47963.9	0.0430993	0.0320228	4.099E-3	5.187E-7	1.00E0
EARTH	2005-09-28.93091	53641.9	0.0798036	0.0730904	2.317E-3	5.263E-7	1.00E0
EARTH	2005-12-13.50743	53717.5	0.0706718	0.0686466	9.103E-4	1.984E-6	1.00E0
EARTH	2006-04-09.90824	53834.9	0.0830873	0.0778429	2.116E-3	8.619E-7	1.00E0
EARTH	2021-10-14.85589	59501.9	0.0130482	0.0130353	4.287E-6	2.383E-8	1.00E0
EARTH	2022-06-03.93487	59733.9	0.1292051	0.1290797	4.492E-5	2.652E-6	1.00E0
EARTH	2023-03-22.98378	60026.0	0.1500445	0.1495237	1.742E-4	3.792E-7	1.00E0
EARTH	2040-10-15.43283	66442.4	0.0172468	0.0116722	3.461E-3	1.259E-7	1.00E0
EARTH	2041-05-18.47278	66657.5	0.1243910	0.1194674	1.824E-3	8.853E-7	1.00E0
EARTH	2057-10-10.89201	72646.9	0.0545123	0.0274867	6.906E-3	1.485E-7	1.00E0
EARTH	2058-06-15.50772	72894.5	0.1383547	0.1362947	1.175E-3	2.138E-6	1.00E0
EARTH	2059-03-19.08355	73171.1	0.1254544	0.1188835	2.297E-3	2.379E-6	1.00E0
EARTH	2075-10-15.21466	79225.2	0.0145208	0.0114029	3.922E-2	2.557E-7	1.00E0
EARTH	2076-05-16.60532	79439.6	0.1274408	0.0114000	3.577E-2	1.236E-6	9.32E-1
EARTH	2091-10-06.24791	85060.2	0.1315324	0.0112069	9.789E-1	1.550E-7	6.81E-2
EARTH	2092-07-01.53041	85329.5	0.1453405	0.0118227	3.887E-2	6.809E-7	7.36E-1
EARTH	2093-03-13.27138	85584.3	0.0871548	0.0212500	9.864E-1	8.006E-7	6.73E-2
EARTH	2108-07-23.46719	91194.5	0.1388724	0.0110691	4.179E-1	1.986E-6	1.54E-1
EARTH	2109-03-11.57319	91425.6	0.0330225	0.0220805	1.889E0	1.145E-6	3.51E-2

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