Asteroids

2021TG14 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.719

Aphelion (Q)

1.652

Eccentricity (e)

0.393

Inclination (i)

2.0

deg

Orbit period (P)

471.4

Earth MOID

0.00164

U parameter

6.3

Next Earth close approach

Date

2027-04-16

Nominal distance (from Earth center)

0.03368

5038789

Maximum Brightness

23.9

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.1

mag

Diameter

6 - 14*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-10-11

Observatory

Pan-STARRS 1, 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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.185464

1-sigma variation

0.000063

Unit

Eccentricity (e)

Value

0.393308

1-sigma variation

0.000061

Unit

Inclination (i)

Value

2.0136

1-sigma variation

1.868E-5

Unit

Long. of Ascending Node (Ω)

Value

207.0795

1-sigma variation

0.0038

Unit

Arg. of Perihelion (ω)

Value

266.5619

1-sigma variation

0.0045

Unit

Mean Anomaly (M)

Value

15.81474

1-sigma variation

0.08866

Unit

Perihelion distance

Value

0.719211

1-sigma variation

Unit

Aphelion distance

Value

1.651716

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.021372

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.017209

1-sigma variation

Unit

MOID

Value

0.001637

1-sigma variation

Unit

Orbit Period

Value

471.4448

1-sigma variation

Unit

U parameter

Value

6.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.97611E-9	3.84672E-9	7.86675E-10	-2.42134E-7	2.84831E-7	-5.59074E-6
e	3.84672E-9	3.72162E-9	7.60560E-10	-2.34252E-7	2.75571E-7	-5.40881E-6
i	7.86675E-10	7.60560E-10	3.49114E-10	-4.83320E-8	5.66995E-8	-1.10610E-6
Ω	-2.42134E-7	-2.34252E-7	-4.83320E-8	1.47462E-5	-1.73460E-5	3.40460E-4
ω	2.84831E-7	2.75571E-7	5.66995E-8	-1.73460E-5	2.04059E-5	-4.00495E-4
M	-5.59074E-6	-5.40881E-6	-1.10610E-6	3.40460E-4	-4.00495E-4	7.86104E-3

Date of computation: 2025-09-10 00:30 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

28.087

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 Aegis	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

1429

Unit

Source

[1]

Normalized RMS of residuals

Value

0.625372

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-10-11.49342

Unit

Source

[2]

Last Observation

Value

2021-10-17.908182

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

59 (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

[-]

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 2021TG14 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
VENUS	1969-02-01 08:06	> 1 d	0.0296884	0.0275594	0.0041305
EARTH	1969-04-14 21:50	1341.7	0.0149837	0.0023749	0.0162548
EARTH	1972-10-28 12:10	1367.8	0.1251330	0.1034290	0.0072350
EARTH	1978-04-15 20:32	578.9	0.0271711	0.0071303	0.0067669
EARTH	1981-11-18 09:16	> 1 d	0.1848964	0.1768093	0.0026960
EARTH	1987-04-24 20:02	1.1	0.1956114	0.1944888	0.0003742
VENUS	1996-02-20 05:00	1285.9	0.0480175	0.0332768	0.0057400
EARTH	2012-10-10 10:47	329.3	0.1347067	0.1201402	0.0048556
EARTH	2018-03-25 08:10	798.1	0.1577911	0.1518975	0.0019645
EARTH	2021-10-18 00:50	< 1 s	0.0016702	0.0016693	0.0000003
EARTH	2027-04-16 07:18	206.9	0.0336822	0.0261053	0.0025270
VENUS	2036-02-19 17:42	202.5	0.0379373	0.0377773	0.0000659
VENUS	2049-01-21 06:57	> 1 d	0.0373605	0.0372810	0.0004103
EARTH	2049-03-28 07:36	> 1 d	0.1472217	0.1269495	0.0067577
EARTH	2052-10-20 19:46	> 1 d	0.0410712	0.0010214	0.0160802
EARTH	2058-04-20 00:34	861.1	0.1045631	0.0717058	0.0109531
VENUS	2061-12-22 13:02	> 1 d	0.0378927	0.0374275	0.0009256
EARTH	2074-10-09 08:34	655.2	0.1778991	0.1483696	0.0098432
VENUS	2074-11-22 17:10	> 1 d	0.0384790	0.0373719	0.0022237
EARTH	2080-03-25 09:37	> 1 d	0.1558920	0.0994830	0.0188139
EARTH	2083-10-20 08:44	> 1 d	0.0205034	0.0002385	0.0298867
EARTH	2089-04-20 00:39	> 1 d	0.1091247	0.0000320	0.0869178
VENUS	2100-09-27 12:49	> 1 mo	0.0382501	0.0380870	0.0189062
EARTH	2105-10-13 03:10	> 1 mo	0.1214924	0.0000863	0.6624619
EARTH	2111-04-11 07:53	> 1 mo	0.0636257	0.0000428	0.9781694
VENUS	2113-08-28 02:05	> 1 mo	0.0379449	0.0378852	0.0457922
EARTH	2114-10-30 23:29	> 1 mo	0.1223234	0.0020285	1.2197701
EARTH	2120-04-22 20:48	> 1 mo	0.1437583	0.0004230	2.3108253

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
293.96557392	283.20140481	0.00158848	MINIMUM
66.98351133	100.64366590	0.00204658	MINIMUM
0.65850720	12.13144690	0.26635705	SADDLE
180.28767800	191.70913531	0.63731346	SADDLE
0.65332396	192.11521702	1.73495925	SADDLE
180.26065423	11.68740578	2.63526029	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2021TG14

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2102-04-15.507	88903.507	-1.092	1.02 ± 0.001	2.09E7	2.04E-8	1.85E-2	-9.44
2103-04-15.764	89268.764	-1.007	0.67 ± 0.002	8.58E6	6.92E-8	1.86E-2	-8.91
2103-04-15.765	89268.765	-1.006	1.11 ± 0.000	1.13E7	3.70E-8	1.86E-2	-9.18
2110-04-16.041	91826.041	-1.045	1.30 ± 0.001	4.51E6	5.60E-8	1.86E-2	-9.04
2113-10-19.720	93108.720	-1.767	0.33 ± 0.001	5.68E6	4.04E-8	1.85E-2	-9.20
2114-04-16.080	93287.080	-0.988	1.17 ± 0.002	3.36E7	1.16E-8	1.86E-2	-9.74
2114-10-19.647	93473.647	2.788	0.76 ± 0.002	5.38E6	3.66E-9	1.85E-2	-10.25
2114-10-19.848	93473.848	-0.937	0.63 ± 0.000	3.41E6	1.95E-7	1.86E-2	-8.52
2115-04-15.148	93651.148	3.106	1.21 ± 0.001	9.22E5	5.08E-9	1.85E-2	-10.11
2115-04-15.261	93651.261	3.097	1.25 ± 0.000	2.09E6	2.08E-9	1.86E-2	-10.49
2118-10-19.322	94934.322	-1.095	1.18 ± 0.000	1.58E8	3.86E-9	1.85E-2	-10.24
2120-04-14.943	95477.943	2.457	0.92 ± 0.001	1.63E6	2.57E-8	1.85E-2	-9.42
2120-10-18.966	95664.966	-1.523	0.76 ± 0.000	3.47E8	8.68E-10	1.85E-2	-10.90


Based on 59 optical observations (of which 1 are rejected as outliers) from 2021/10/11.493 to 2021/10/17.908.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.41 and 1.41 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: