Asteroids

2021RR5 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.871

Aphelion (Q)

1.617

Eccentricity (e)

0.300

Inclination (i)

7.3

deg

Orbit period (P)

506.6

Earth MOID

0.00066

U parameter

6.6

Next Earth close approach

Date

2033-01-30

Nominal distance (from Earth center)

0.18817

28149433

Maximum Brightness

27.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.3

mag

Diameter

6 - 13*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-08

Observatory

Mt. Lemmon Survey

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

1.243709

1-sigma variation

0.000109

Unit

Eccentricity (e)

Value

0.300042

1-sigma variation

0.000068

Unit

Inclination (i)

Value

7.3150

1-sigma variation

0.0004

Unit

Long. of Ascending Node (Ω)

Value

170.0210

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

245.2693

1-sigma variation

0.0043

Unit

Mean Anomaly (M)

Value

330.24673

1-sigma variation

0.13516

Unit

Perihelion distance

Value

0.870544

1-sigma variation

Unit

Aphelion distance

Value

1.616874

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.299881

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.001347

1-sigma variation

Unit

MOID

Value

0.000661

1-sigma variation

Unit

Orbit Period

Value

506.6132

1-sigma variation

Unit

U parameter

Value

6.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.19674E-8	7.46124E-9	4.47705E-8	1.17321E-8	-4.64286E-7	-1.47862E-5
e	7.46124E-9	4.65513E-9	2.82287E-8	7.18052E-9	-2.88624E-7	-9.21891E-6
i	4.47705E-8	2.82287E-8	1.99729E-7	3.05019E-8	-1.65661E-6	-5.53355E-5
Ω	1.17321E-8	7.18052E-9	3.05019E-8	1.73745E-8	-4.89248E-7	-1.44874E-5
ω	-4.64286E-7	-2.88624E-7	-1.65661E-6	-4.89248E-7	1.82264E-5	5.73594E-4
M	-1.47862E-5	-9.21891E-6	-5.53355E-5	-1.44874E-5	5.73594E-4	1.82691E-2

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

28.334

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

6 - 13*

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

1473

Unit

Source

[1]

Normalized RMS of residuals

Value

0.535232

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-08.182212

Unit

Source

[2]

Last Observation

Value

2021-09-11.79188

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

49 (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 2021RR5 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	1955-09-15 18:45	> 1 w	0.0207172	0.0021794	0.1324125
EARTH	1959-01-07 22:27	> 1 w	0.0947563	0.0910887	0.0309975
MARS	1974-09-26 20:13	231.3	0.0445313	0.0350090	0.0046036
EARTH	1978-09-17 12:57	> 1 d	0.0312329	0.0020735	0.0108635
EARTH	1982-01-12 12:36	1150.8	0.1270869	0.1027331	0.0095047
EARTH	1998-09-01 18:20	1309.5	0.1254541	0.0818340	0.0145468
EARTH	2001-12-13 19:51	> 1 d	0.1186601	0.1058912	0.0049223
EARTH	2021-09-12 17:42	< 1 min	0.0005265	0.0005262	0.0000001
EARTH	2033-01-30 23:17	504.1	0.1881673	0.1651375	0.0078755
EARTH	2039-11-03 21:52	> 1 d	0.1514026	0.1394928	0.0041593
EARTH	2046-08-30 12:41	1139.7	0.1885918	0.1391146	0.0164974
EARTH	2058-01-19 18:56	> 1 d	0.1074900	0.0974629	0.0072073
EARTH	2064-09-11 05:26	> 1 d	0.0145742	0.0001620	0.0209279
EARTH	2075-10-21 11:49	> 1 mo	0.1364487	0.0663718	0.2643618
EARTH	2087-01-09 14:58	> 1 mo	0.1388612	0.0894260	0.6211862
EARTH	2098-01-28 23:47	> 1 mo	0.1279876	0.0952430	0.8587131
EARTH	2104-09-05 00:23	> 1 mo	0.1133078	0.0027269	1.3544065
EARTH	2115-09-22 03:41	> 1 mo	0.0563227	0.0020705	0.8375520

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
309.60118835	248.57581490	0.00018229	MINIMUM
51.81181995	19.97329166	0.09832168	MINIMUM
5.36755082	320.90386127	0.16122854	SADDLE
180.50850671	132.81896810	0.62380474	SADDLE
358.03361971	131.00796767	1.87829486	SADDLE
178.17721781	311.09721229	2.60184742	MAXIMUM

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MOID Plots

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