Asteroids

2021TS15 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.699

Aphelion (Q)

1.033

Eccentricity (e)

0.192

Inclination (i)

1.3

deg

Orbit period (P)

294.3

Earth MOID

0.00671

U parameter

8.3

Next Earth close approach

Date

2042-12-11

Nominal distance (from Earth center)

0.07079

10590753

Maximum Brightness

24.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.7

mag

Diameter

12 - 27*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-10-14

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

0.865938

1-sigma variation

0.000666

Unit

Eccentricity (e)

Value

0.192355

1-sigma variation

0.001367

Unit

Inclination (i)

Value

1.3240

1-sigma variation

0.1216

Unit

Long. of Ascending Node (Ω)

Value

57.3086

1-sigma variation

1.9234

Unit

Arg. of Perihelion (ω)

Value

160.2783

1-sigma variation

1.9167

Unit

Mean Anomaly (M)

Value

182.28687

1-sigma variation

0.22030

Unit

Perihelion distance

Value

0.699370

1-sigma variation

Unit

Aphelion distance

Value

1.032505

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.030169

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.307163

1-sigma variation

Unit

MOID

Value

0.006708

1-sigma variation

Unit

Orbit Period

Value

294.3258

1-sigma variation

Unit

U parameter

Value

8.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.43539E-7	9.10094E-7	8.09881E-5	1.28094E-3	-1.27649E-3	-1.46720E-4
e	9.10094E-7	1.86742E-6	1.66179E-4	2.62835E-3	-2.61921E-3	-3.01053E-4
i	8.09881E-5	1.66179E-4	1.47880E-2	2.33893E-1	-2.33080E-1	-2.67903E-2
Ω	1.28094E-3	2.62835E-3	2.33893E-1	3.69934E0	-3.68649E0	-4.23726E-1
ω	-1.27649E-3	-2.61921E-3	-2.33080E-1	-3.68649E0	3.67367E0	4.22253E-1
M	-1.46720E-4	-3.01053E-4	-2.67903E-2	-4.23726E-1	4.22253E-1	4.85340E-2

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

26.726

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

12 - 27*

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 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

1420

Unit

Source

[1]

Normalized RMS of residuals

Value

0.613284

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-10-14.40515

Unit

Source

[2]

Last Observation

Value

2021-10-28.28381

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

20 (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 2021TS15 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	1954-12-11 05:23	> 1 mo	0.0263601	0.0068729	3.7953569
EARTH	1958-09-26 05:37	> 1 mo	0.0612142	0.0241065	3.8056461
VENUS	1960-01-17 22:11	> 1 mo	0.0262407	0.0246595	0.7668859
EARTH	1971-12-09 14:03	> 1 mo	0.0104132	0.0059404	0.1705136
EARTH	1975-10-30 15:54	> 1 w	0.0404293	0.0374952	0.0041412
EARTH	1979-09-30 17:22	> 1 w	0.0266650	0.0195495	0.1185356
EARTH	1983-09-28 17:17	> 1 d	0.1779894	0.0213884	0.3433650
VENUS	1996-05-03 23:10	> 1 mo	0.0292105	0.0269925	0.0412438
EARTH	2000-12-12 11:35	1346.0	0.1144242	0.0076546	0.1387145
EARTH	2004-11-28 07:22	> 1 mo	0.0246121	0.0097533	0.0385997
VENUS	2006-11-27 21:16	> 1 d	0.0154779	0.0042816	0.0213832
EARTH	2008-09-25 02:40	82.5	0.1093839	0.0432443	0.0227099
EARTH	2017-12-13 00:28	251.2	0.1713410	0.1439817	0.0091228
EARTH	2021-10-12 23:44	< 1 min	0.0353404	0.0351286	0.0000706
VENUS	2024-09-24 23:37	> 1 d	0.0080878	0.0049600	0.0049933
EARTH	2042-12-11 23:18	790.8	0.0707948	0.0079314	0.0527612
EARTH	2046-11-16 01:58	> 1 d	0.0358526	0.0282725	0.0028164
EARTH	2050-09-30 00:08	> 1 d	0.0236470	0.0181277	0.0233791
VENUS	2058-07-25 17:50	> 1 mo	0.0106283	0.0058675	0.0851876
VENUS	2068-11-24 15:47	> 1 mo	0.0294795	0.0284129	0.2994385
EARTH	2079-12-08 20:47	870.7	0.1907536	0.0063705	2.2556818
EARTH	2083-12-10 16:48	> 1 mo	0.1108892	0.0095306	1.5160808
VENUS	2087-05-06 16:03	> 1 mo	0.0386245	0.0288570	3.4837552
EARTH	2087-12-09 22:11	> 1 mo	0.0561368	0.0057038	4.2946228
EARTH	2091-12-10 09:25	> 1 mo	0.0823050	0.0037161	1.4402567
EARTH	2095-12-09 17:28	> 1 w	0.1363542	0.0108424	2.0672871
VENUS	2108-12-17 15:36	> 1 mo	0.0333454	0.0245317	1.8276844
VENUS	2122-07-28 01:08	> 1 mo	0.0205480	0.0029901	10.4343939

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
223.52073524	332.13795421	0.00668115	MINIMUM
145.22285189	267.36784449	0.01749140	MINIMUM
182.93029792	298.54065326	0.04066053	SADDLE
5.78124159	121.20675649	0.30841165	SADDLE
5.77113277	301.21392973	1.69136812	SADDLE
184.08151137	119.49361134	2.03983333	MAXIMUM

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MOID Plots

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