Asteroids

2021NS8 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.882

Aphelion (Q)

1.299

Eccentricity (e)

0.191

Inclination (i)

2.0

deg

Orbit period (P)

416.0

Earth MOID

0.02451

U parameter

6.4

Next Earth close approach

Date

2029-08-10

Nominal distance (from Earth center)

0.14441

21603179

Maximum Brightness

23.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

27 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-07-13

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

1.090534

1-sigma variation

0.000059

Unit

Eccentricity (e)

Value

0.191293

1-sigma variation

0.000091

Unit

Inclination (i)

Value

1.9970

1-sigma variation

0.0010

Unit

Long. of Ascending Node (Ω)

Value

248.3967

1-sigma variation

0.0066

Unit

Arg. of Perihelion (ω)

Value

157.2356

1-sigma variation

0.0074

Unit

Mean Anomaly (M)

Value

205.28987

1-sigma variation

0.09990

Unit

Perihelion distance

Value

0.881923

1-sigma variation

Unit

Aphelion distance

Value

1.299146

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.260155

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.093040

1-sigma variation

Unit

MOID

Value

0.024511

1-sigma variation

Unit

Orbit Period

Value

415.9657

1-sigma variation

Unit

U parameter

Value

6.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.48663E-9	5.34572E-9	6.17976E-8	3.90972E-7	-4.35170E-7	-5.89858E-6
e	5.34572E-9	8.19680E-9	9.47719E-8	5.99900E-7	-6.67511E-7	-9.04381E-6
i	6.17976E-8	9.47719E-8	1.09616E-6	6.94697E-6	-7.72518E-6	-1.04550E-4
Ω	3.90972E-7	5.99900E-7	6.94697E-6	4.42065E-5	-4.90605E-5	-6.61489E-4
ω	-4.35170E-7	-6.67511E-7	-7.72518E-6	-4.90605E-5	5.45077E-5	7.36245E-4
M	-5.89858E-6	-9.04381E-6	-1.04550E-4	-6.61489E-4	7.36245E-4	9.97907E-3

Date of computation: 2025-11-24 16:53 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

25.005

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

27 - 60*

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

1641

Unit

Source

[1]

Normalized RMS of residuals

Value

0.504622

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-07-13.473763

Unit

Source

[2]

Last Observation

Value

2021-08-15.36974

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

30 (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 2021NS8 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1954-08-08 08:32	> 1 d	0.1707578	0.0512825	0.0426281
EARTH	1964-01-08 12:31	> 1 w	0.0411781	0.0243145	0.0274307
EARTH	1971-08-19 12:35	478.8	0.0348194	0.0344080	0.0005548
EARTH	1981-01-16 14:26	> 1 d	0.0348405	0.0241780	0.0115861
EARTH	1988-07-17 15:30	> 1 w	0.1691996	0.1470449	0.0074607
EARTH	1988-10-20 14:05	> 1 w	0.1097314	0.1058068	0.0013922
EARTH	1996-08-12 09:08	203.5	0.0968203	0.0855291	0.0038025
EARTH	2006-01-18 20:46	785.8	0.0523821	0.0341651	0.0066374
EARTH	2013-11-18 01:40	> 1 d	0.1063816	0.1038944	0.0008441
EARTH	2014-02-15 15:27	> 1 d	0.1678739	0.1587943	0.0030280
EARTH	2021-08-25 02:23	< 1 min	0.0471031	0.0470319	0.0000237
EARTH	2029-08-10 05:19	253.5	0.1444083	0.1327420	0.0038996
EARTH	2039-01-23 12:13	492.5	0.1205372	0.1001292	0.0068352
EARTH	2047-01-04 04:37	> 1 d	0.0520653	0.0381730	0.0049808
EARTH	2054-10-10 03:11	1137.3	0.1040895	0.1029237	0.0003900
EARTH	2062-08-14 04:11	449.1	0.0792615	0.0676089	0.0039670
EARTH	2072-01-23 07:12	558.2	0.1097343	0.0878033	0.0073642
EARTH	2079-12-02 02:18	> 1 d	0.0967450	0.0907558	0.0020327
EARTH	2087-08-26 12:10	616.4	0.0509157	0.0471091	0.0013134
EARTH	2095-08-09 00:30	58.9	0.1689484	0.1648300	0.0013735
EARTH	2105-01-20 12:15	405.0	0.0687026	0.0562694	0.0042187
EARTH	2112-12-18 22:47	> 1 d	0.0783458	0.0749383	0.0011448
EARTH	2120-08-02 11:15	1341.4	0.1494080	0.1470990	0.0007701
EARTH	2120-10-11 13:33	1274.7	0.1041213	0.1036772	0.0001488

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
57.97597992	11.93842277	0.02451095	MINIMUM
291.62076835	226.01659036	0.03455710	MINIMUM
353.47608740	297.42068823	0.11088757	SADDLE
176.10195899	120.46806983	0.28958513	SADDLE
354.83111091	119.06439090	1.89172225	SADDLE
176.73043590	301.00120688	2.29049037	MAXIMUM

Download:

MOID Plots

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