Asteroids

2021QC3 help

Last update: 2026-07-30 14:25 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.963

Aphelion (Q)

2.298

Eccentricity (e)

0.409

Inclination (i)

19.8

deg

Orbit period (P)

760.5

Earth MOID

0.07367

U parameter

7.4

Next Earth close approach

Date

2046-09-10

Nominal distance (from Earth center)

0.09193

13752401

Maximum Brightness

20.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.2

mag

Diameter

40 - 90*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-08-30

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.630524

1-sigma variation

0.000630

Unit

Eccentricity (e)

Value

0.409139

1-sigma variation

0.000224

Unit

Inclination (i)

Value

19.7555

1-sigma variation

0.0078

Unit

Long. of Ascending Node (Ω)

Value

163.7294

1-sigma variation

0.0009

Unit

Arg. of Perihelion (ω)

Value

235.2269

1-sigma variation

0.0054

Unit

Mean Anomaly (M)

Value

77.78154

1-sigma variation

0.46048

Unit

Perihelion distance

Value

0.963412

1-sigma variation

Unit

Aphelion distance

Value

2.297636

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.779369

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.092243

1-sigma variation

Unit

MOID

Value

0.073671

1-sigma variation

Unit

Orbit Period

Value

760.4827

1-sigma variation

Unit

U parameter

Value

7.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.97199E-7	1.40891E-7	4.94487E-6	-5.44817E-7	-3.41561E-6	-2.90212E-4
e	1.40891E-7	4.99761E-8	1.75401E-6	-1.93252E-7	-1.21154E-6	-1.02942E-4
i	4.94487E-6	1.75401E-6	6.15643E-5	-6.78366E-6	-4.25204E-5	-3.61295E-3
Ω	-5.44817E-7	-1.93252E-7	-6.78366E-6	7.47668E-7	4.68483E-6	3.98069E-4
ω	-3.41561E-6	-1.21154E-6	-4.25204E-5	4.68483E-6	2.93811E-5	2.49560E-3
M	-2.90212E-4	-1.02942E-4	-3.61295E-3	3.98069E-4	2.49560E-3	2.12043E-1

Date of computation: 2026-07-30 14:25 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

24.163

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

40 - 90*

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

1870

Unit

Source

[1]

Normalized RMS of residuals

Value

0.556697

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-08-30.263058

Unit

Source

[2]

Last Observation

Value

2021-09-26.2604

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

34 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2021QC3 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	1969-09-06 08:49	> 1 w	0.1517994	0.0662332	0.1428247
EARTH	2021-09-15 18:12	< 1 min	0.0893856	0.0892706	0.0000384
EARTH	2046-09-10 16:24	> 1 d	0.0919291	0.0730798	0.0548029
EARTH	2098-09-19 14:46	> 1 w	0.1368892	0.0682098	0.1906038
EARTH	2123-09-14 02:32	> 1 w	0.0770723	0.0756765	0.0395792

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
327.64630153	246.70740786	0.07367141	MINIMUM
184.40471407	115.43281197	1.36172083	SADDLE
1.54832442	116.28828405	1.95039171	SADDLE
176.91314026	290.47287795	3.26483308	MAXIMUM

Download:

MOID Plots

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