Asteroids

2021QR3 help

Last update: 2025-04-09 07:59 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Aten

Perihelion (q)

0.524

Aphelion (Q)

1.348

Eccentricity (e)

0.440

Inclination (i)

9.4

deg

Orbit period (P)

330.6

Earth MOID

0.01331

U parameter

7.8

Next Earth close approach

Date

2038-05-13

Nominal distance (from Earth center)

0.18233

27276526

Maximum Brightness

23.3

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

23.9

mag

Diameter

50 - 100*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-08-31

Observatory

Pan-STARRS 2, 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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.935788

1-sigma variation

0.000316

Unit

Eccentricity (e)

Value

0.440308

1-sigma variation

0.000742

Unit

Inclination (i)

Value

9.4444

1-sigma variation

0.0213

Unit

Long. of Ascending Node (Ω)

Value

356.5146

1-sigma variation

0.0040

Unit

Arg. of Perihelion (ω)

Value

119.6515

1-sigma variation

0.0096

Unit

Mean Anomaly (M)

Value

294.28009

1-sigma variation

0.62313

Unit

Perihelion distance

Value

0.523753

1-sigma variation

Unit

Aphelion distance

Value

1.347823

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.039750

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.375847

1-sigma variation

Unit

MOID

Value

0.013309

1-sigma variation

Unit

Orbit Period

Value

330.6470

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.97511E-8	2.34403E-7	6.72036E-6	1.27129E-6	-3.04103E-6	-1.96806E-4
e	2.34403E-7	5.50827E-7	1.57923E-5	2.98734E-6	-7.14571E-6	-4.62470E-4
i	6.72036E-6	1.57923E-5	4.52766E-4	8.56467E-5	-2.04867E-4	-1.32591E-2
Ω	1.27129E-6	2.98734E-6	8.56467E-5	1.62029E-5	-3.87589E-5	-2.50822E-3
ω	-3.04103E-6	-7.14571E-6	-2.04867E-4	-3.87589E-5	9.27258E-5	5.99989E-3
M	-1.96806E-4	-4.62470E-4	-1.32591E-2	-2.50822E-3	5.99989E-3	3.88293E-1

Date of computation: 2025-04-09 07:59 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

23.854

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 - 100*

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

1392

Unit

Source

[1]

Normalized RMS of residuals

Value

0.64729

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-08-31.537959

Unit

Source

[2]

Last Observation

Value

2021-09-13.13737

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

36 (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 2021QR3 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	1952-05-16 16:54	> 1 mo	0.1471995	0.1457088	0.1317685
EARTH	1954-09-15 21:59	> 1 w	0.0939241	0.0135225	0.8497298
EARTH	1971-05-14 04:46	> 1 d	0.1832106	0.1499940	0.1143208
EARTH	1973-09-15 01:35	> 1 d	0.0160387	0.0144794	0.0355997
EARTH	1990-05-13 16:01	> 1 d	0.1853569	0.1487427	0.0581986
EARTH	1992-09-15 02:01	> 1 d	0.0208497	0.0140498	0.0668172
EARTH	2002-09-08 19:04	> 1 d	0.1916326	0.0143438	0.0641829
EARTH	2009-05-18 02:36	> 1 d	0.1469510	0.1466478	0.0027230
EARTH	2011-09-14 00:14	> 1 d	0.1532841	0.0682609	0.0283669
EARTH	2021-09-14 00:43	< 1 min	0.0426601	0.0423930	0.0000890
EARTH	2038-05-13 22:08	1364.9	0.1823323	0.1479706	0.0257968
EARTH	2040-09-15 11:10	1230.8	0.0304065	0.0130503	0.0470443
EARTH	2050-09-10 05:29	720.8	0.1599846	0.1209590	0.0130236
EARTH	2057-05-20 02:49	586.4	0.1559534	0.1474022	0.0051532
EARTH	2059-09-10 02:20	> 1 d	0.1910888	0.1399382	0.0170573
EARTH	2069-09-15 09:39	> 1 d	0.0141797	0.0125223	0.0255356
EARTH	2079-09-11 12:37	> 1 w	0.1349206	0.0124685	0.4171274
EARTH	2086-05-23 01:34	> 1 w	0.1862726	0.1491463	0.3678303
EARTH	2096-05-15 16:15	> 1 w	0.1537451	0.1477071	0.2315564
EARTH	2098-09-15 22:57	> 1 w	0.1147934	0.0093865	0.8594205
EARTH	2108-09-15 07:26	> 1 mo	0.0338661	0.0117802	1.0120342
EARTH	2125-05-17 09:30	> 1 mo	0.1533139	0.1482166	0.3789012

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
260.93858882	251.29729482	0.01324089	MINIMUM
95.57828894	134.26207809	0.14695729	MINIMUM
176.43122552	192.55557542	0.37227638	SADDLE
357.96420602	10.99332815	0.47096681	SADDLE
0.04903386	194.24430010	1.53638631	SADDLE
180.97464696	15.43828028	2.32521439	MAXIMUM

Download:

MOID Plots

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