Asteroids

2021NC6 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.882

Aphelion (Q)

1.998

Eccentricity (e)

0.387

Inclination (i)

1.9

deg

Orbit period (P)

631.3

Earth MOID

0.01550

U parameter

8.0

Next Earth close approach

Date

2040-09-14

Nominal distance (from Earth center)

0.11881

17774214

Maximum Brightness

32.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.3

mag

Diameter

60 - 130*

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

1.440183

1-sigma variation

0.001238

Unit

Eccentricity (e)

Value

0.387307

1-sigma variation

0.000656

Unit

Inclination (i)

Value

1.8822

1-sigma variation

0.0029

Unit

Long. of Ascending Node (Ω)

Value

208.4931

1-sigma variation

0.0200

Unit

Arg. of Perihelion (ω)

Value

156.8814

1-sigma variation

0.0202

Unit

Mean Anomaly (M)

Value

148.59239

1-sigma variation

1.11145

Unit

Perihelion distance

Value

0.882390

1-sigma variation

Unit

Aphelion distance

Value

1.997976

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.895289

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.092723

1-sigma variation

Unit

MOID

Value

0.015496

1-sigma variation

Unit

Orbit Period

Value

631.2842

1-sigma variation

Unit

U parameter

Value

8.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.53294E-6	8.11744E-7	3.62312E-6	2.44798E-5	-2.48349E-5	-1.37611E-3
e	8.11744E-7	4.29868E-7	1.91886E-6	1.29768E-5	-1.31594E-5	-7.28700E-4
i	3.62312E-6	1.91886E-6	8.56733E-6	5.80501E-5	-5.88156E-5	-3.25248E-3
Ω	2.44798E-5	1.29768E-5	5.80501E-5	4.00364E-4	-4.02551E-4	-2.19766E-2
ω	-2.48349E-5	-1.31594E-5	-5.88156E-5	-4.02551E-4	4.06192E-4	2.22950E-2
M	-1.37611E-3	-7.28700E-4	-3.25248E-3	-2.19766E-2	2.22950E-2	1.23533E0

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

23.33

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

60 - 130*

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

1502

Unit

Source

[1]

Normalized RMS of residuals

Value

0.409341

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-07-13.28919

Unit

Source

[2]

Last Observation

Value

2021-08-05.2005

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

27 (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 2021NC6 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
MARS	1950-07-30 20:00	165.0	0.0423979	0.0422326	0.0042220
EARTH	1952-07-14 11:52	> 1 d	0.1904756	0.0460592	0.0512009
EARTH	1964-10-13 23:58	> 1 d	0.1094089	0.0923818	0.0057784
EARTH	1983-09-02 18:25	> 1 mo	0.1082409	0.0519027	0.0395477
EARTH	2002-08-11 14:13	> 1 mo	0.0661764	0.0340542	0.0924685
EARTH	2014-12-05 01:09	> 1 d	0.1957757	0.0282724	0.0574313
EARTH	2021-08-17 19:41	< 1 min	0.0821397	0.0817335	0.0001354
EARTH	2040-09-14 18:32	> 1 mo	0.1188133	0.0869321	0.0206859
EARTH	2059-10-17 03:43	> 1 mo	0.1067978	0.0398748	0.0734200
EARTH	2078-11-07 21:41	> 1 mo	0.0625246	0.0181831	0.1063092
EARTH	2085-07-15 13:10	> 1 d	0.1931505	0.1130776	0.0269730
EARTH	2097-10-23 15:30	> 1 mo	0.0970952	0.0295149	0.0904508
EARTH	2116-09-19 20:29	> 1 mo	0.1203478	0.1046999	0.0362558

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
35.54901150	315.30212351	0.01547182	MINIMUM
319.94121604	206.07743303	0.03281257	MINIMUM
356.99939895	259.69620400	0.12042516	SADDLE
178.84464916	81.93238996	1.00040133	SADDLE
357.48690072	80.42572388	1.88004764	SADDLE
178.91152000	261.97466023	2.99985632	MAXIMUM

Download:

MOID Plots

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