Asteroids

2021QR3 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.524

Aphelion (Q)

1.348

Eccentricity (e)

0.440

Inclination (i)

9.4

deg

Orbit period (P)

330.7

Earth MOID

0.01358

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

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.935824

1-sigma variation

0.000316

Unit

Eccentricity (e)

Value

0.440311

1-sigma variation

0.000742

Unit

Inclination (i)

Value

9.4443

1-sigma variation

0.0213

Unit

Long. of Ascending Node (Ω)

Value

356.5122

1-sigma variation

0.0040

Unit

Arg. of Perihelion (ω)

Value

119.6552

1-sigma variation

0.0096

Unit

Mean Anomaly (M)

Value

152.02514

1-sigma variation

0.73338

Unit

Perihelion distance

Value

0.523770

1-sigma variation

Unit

Aphelion distance

Value

1.347877

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.040462

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.376716

1-sigma variation

Unit

MOID

Value

0.013576

1-sigma variation

Unit

Orbit Period

Value

330.6659

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.99634E-8	2.34685E-7	6.72712E-6	1.27722E-6	-3.05020E-6	-2.31872E-4
e	2.34685E-7	5.50981E-7	1.57936E-5	2.99850E-6	-7.16066E-6	-5.44368E-4
i	6.72712E-6	1.57936E-5	4.52714E-4	8.59497E-5	-2.05255E-4	-1.56040E-2
Ω	1.27722E-6	2.99850E-6	8.59497E-5	1.63197E-5	-3.89741E-5	-2.96259E-3
ω	-3.05020E-6	-7.16066E-6	-2.05255E-4	-3.89741E-5	9.30879E-5	7.07517E-3
M	-2.31872E-4	-5.44368E-4	-1.56040E-2	-2.96259E-3	7.07517E-3	5.37842E-1

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

23.855

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

1466

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	0.1317686
EARTH	1954-09-15 21:59	> 1 w	0.0939241	0.0135225	0.8497310
EARTH	1971-05-14 04:46	> 1 d	0.1832106	0.1499940	0.1143210
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	0.0581987
EARTH	1992-09-15 02:01	> 1 d	0.0208497	0.0140498	0.0668173
EARTH	2002-09-08 19:04	> 1 d	0.1916326	0.0143438	0.0641830
EARTH	2009-05-18 02:36	> 1 d	0.1469510	0.1466478	0.0027230
EARTH	2011-09-14 00:14	> 1 d	0.1532841	0.0682614	0.0283670
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	0.0257969
EARTH	2040-09-15 11:10	1230.8	0.0304065	0.0130503	0.0470444
EARTH	2050-09-10 05:29	720.8	0.1599846	0.1209589	0.0130237
EARTH	2057-05-20 02:49	586.4	0.1559534	0.1474022	0.0051532
EARTH	2059-09-10 02:20	> 1 d	0.1910888	0.1399381	0.0170573
EARTH	2069-09-15 09:39	> 1 d	0.0141797	0.0125223	0.0255357
EARTH	2079-09-11 12:37	> 1 w	0.1349206	0.0124685	0.4171280
EARTH	2086-05-23 01:34	> 1 w	0.1862726	0.1491463	0.3678308
EARTH	2096-05-15 16:15	> 1 w	0.1537451	0.1477071	0.2315568
EARTH	2098-09-15 22:57	> 1 w	0.1147934	0.0093865	0.8594217
EARTH	2108-09-15 07:26	> 1 mo	0.0338661	0.0117802	1.0120357
EARTH	2125-05-17 09:30	> 1 mo	0.1533139	0.1482166	0.3789018

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
260.91335008	250.86574850	0.01330895	MINIMUM
95.54993778	133.89633856	0.14689708	MINIMUM
176.41613518	192.16655580	0.37260391	SADDLE
357.91679950	10.57467323	0.47194832	SADDLE
359.98432609	193.80407497	1.53602537	SADDLE
180.95016448	15.04241120	2.32619570	MAXIMUM

Download:

MOID Plots

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