Asteroids

2021NO3 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.577

Aphelion (Q)

2.980

Eccentricity (e)

0.675

Inclination (i)

2.3

deg

Orbit period (P)

866.7

Earth MOID

0.02372

U parameter

8.8

Next Earth close approach

Date

2036-01-22

Nominal distance (from Earth center)

0.04623

6915272

Maximum Brightness

20.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.6

mag

Diameter

50 - 110*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-07-08

Observatory

Observatorio Campo dos Amarais

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

1.778974

1-sigma variation

0.006375

Unit

Eccentricity (e)

Value

0.675388

1-sigma variation

0.001475

Unit

Inclination (i)

Value

2.3157

1-sigma variation

0.0072

Unit

Long. of Ascending Node (Ω)

Value

83.0822

1-sigma variation

0.0343

Unit

Arg. of Perihelion (ω)

Value

309.3512

1-sigma variation

0.0370

Unit

Mean Anomaly (M)

Value

277.12836

1-sigma variation

3.40180

Unit

Perihelion distance

Value

0.577477

1-sigma variation

Unit

Aphelion distance

Value

2.980471

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.307326

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.677012

1-sigma variation

Unit

MOID

Value

0.023721

1-sigma variation

Unit

Orbit Period

Value

866.6681

1-sigma variation

Unit

U parameter

Value

8.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.06372E-5	9.40057E-6	4.59736E-5	2.17237E-4	-2.34635E-4	-2.16855E-2
e	9.40057E-6	2.17463E-6	1.06346E-5	5.02485E-5	-5.42727E-5	-5.01650E-3
i	4.59736E-5	1.06346E-5	5.21251E-5	2.47053E-4	-2.66759E-4	-2.45333E-2
Ω	2.17237E-4	5.02485E-5	2.47053E-4	1.17590E-3	-1.26918E-3	-1.15926E-1
ω	-2.34635E-4	-5.42727E-5	-2.66759E-4	-1.26918E-3	1.36998E-3	1.25210E-1
M	-2.16855E-2	-5.01650E-3	-2.45333E-2	-1.15926E-1	1.25210E-1	1.15722E1

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

23.585

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

50 - 110*

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

1594

Unit

Source

[1]

Normalized RMS of residuals

Value

0.343401

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-07-08.17726

Unit

Source

[2]

Last Observation

Value

2021-07-16.997141

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

28 (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 2021NO3 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	1972-01-28 04:47	> 1 mo	0.0772423	0.0254276	47.3184653
EARTH	1976-07-19 07:26	> 1 mo	0.0251624	0.0226822	7.3829189
VENUS	1983-11-08 09:35	> 1 mo	0.0069832	0.0069795	0.0010022
EARTH	2017-01-26 12:09	> 1 w	0.0552706	0.0260856	0.1450621
EARTH	2021-07-21 05:58	< 1 min	0.0239228	0.0237610	0.0000539
EARTH	2036-01-22 11:37	> 1 w	0.0462257	0.0261507	0.3346507
EARTH	2040-07-16 04:59	> 1 w	0.0897894	0.0238228	0.3302478
EARTH	2055-01-15 18:39	> 1 d	0.1360792	0.0259650	0.0469795
EARTH	2059-07-12 20:12	> 1 w	0.1755663	0.0237322	0.1862530
EARTH	2074-01-10 01:24	> 1 mo	0.1928780	0.0292201	0.5096692

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
309.38257788	196.32638029	0.02378444	MINIMUM
48.53442152	21.21542516	0.02606504	MINIMUM
358.20391345	287.68157496	0.41797148	SADDLE
358.27652747	107.86043846	1.58228537	SADDLE
179.65041627	109.77497286	1.97580661	SADDLE
179.69185206	289.79652321	3.97441421	MAXIMUM

Download:

MOID Plots

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