Asteroids

2021RY3 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.446

Aphelion (Q)

1.093

Eccentricity (e)

0.420

Inclination (i)

13.5

deg

Orbit period (P)

246.6

Earth MOID

0.02737

U parameter

7.9

Next Earth close approach

Date

2027-07-28

Nominal distance (from Earth center)

0.18462

27619488

Maximum Brightness

24.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.5

mag

Diameter

22 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-07

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

0.769657

1-sigma variation

0.000208

Unit

Eccentricity (e)

Value

0.420350

1-sigma variation

0.000703

Unit

Inclination (i)

Value

13.5164

1-sigma variation

0.0397

Unit

Long. of Ascending Node (Ω)

Value

344.3188

1-sigma variation

0.0076

Unit

Arg. of Perihelion (ω)

Value

160.2751

1-sigma variation

0.0054

Unit

Mean Anomaly (M)

Value

310.05300

1-sigma variation

0.97928

Unit

Perihelion distance

Value

0.446131

1-sigma variation

Unit

Aphelion distance

Value

1.093182

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.040088

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.538744

1-sigma variation

Unit

MOID

Value

0.027373

1-sigma variation

Unit

Orbit Period

Value

246.6289

1-sigma variation

Unit

U parameter

Value

7.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.31104E-8	-1.45998E-7	-8.24039E-6	-1.57214E-6	1.13015E-6	-2.03329E-4
e	-1.45998E-7	4.94447E-7	2.79081E-5	5.32445E-6	-3.82792E-6	6.88600E-4
i	-8.24039E-6	2.79081E-5	1.57530E-3	3.00547E-4	-2.16110E-4	3.88658E-2
Ω	-1.57214E-6	5.32445E-6	3.00547E-4	5.73407E-5	-4.12321E-5	7.41502E-3
ω	1.13015E-6	-3.82792E-6	-2.16110E-4	-4.12321E-5	2.96725E-5	-5.33043E-3
M	-2.03329E-4	6.88600E-4	3.88658E-2	7.41502E-3	-5.33043E-3	9.59000E-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

25.456

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

22 - 50*

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

1466

Unit

Source

[1]

Normalized RMS of residuals

Value

0.599442

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-07.43925

Unit

Source

[2]

Last Observation

Value

2021-09-12.86259

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (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 2021RY3 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	1950-08-12 04:15	> 1 mo	0.1401708	0.1257628	0.3440650
EARTH	1952-07-27 01:22	> 1 mo	0.1899129	0.1614877	0.5468861
EARTH	1969-09-14 13:40	> 1 d	0.1478388	0.0362871	0.3588031
EARTH	1971-09-12 23:37	> 1 w	0.0273749	0.0267616	0.0497310
EARTH	1973-08-28 20:42	> 1 mo	0.0967919	0.0602551	0.1232365
EARTH	1975-08-08 10:31	> 1 mo	0.1474507	0.1354203	0.0656632
EARTH	1994-09-14 22:44	1329.7	0.1445786	0.0364941	0.0743478
EARTH	1996-09-12 05:19	> 1 d	0.0275882	0.0271860	0.0080969
EARTH	1998-08-29 03:29	> 1 w	0.0964873	0.0602491	0.0240958
EARTH	2000-08-08 00:02	> 1 d	0.1463190	0.1336448	0.0125647
EARTH	2019-09-15 01:28	77.4	0.1578901	0.1444642	0.0044901
EARTH	2021-09-13 07:36	< 1 min	0.0332690	0.0330403	0.0000762
EARTH	2023-09-01 06:42	1002.1	0.0856256	0.0788399	0.0023282
EARTH	2025-08-11 21:03	> 1 d	0.1387807	0.1329845	0.0022930
EARTH	2027-07-28 11:01	946.5	0.1846249	0.1692501	0.0062854
EARTH	2046-09-15 07:03	674.5	0.0829694	0.0323530	0.0483031
EARTH	2048-09-08 01:05	> 1 d	0.0481438	0.0314109	0.0324666
EARTH	2050-08-21 10:18	> 1 w	0.1186291	0.0943147	0.0194516
EARTH	2052-08-01 17:49	> 1 d	0.1604283	0.1479579	0.0171525
EARTH	2071-09-15 15:51	453.9	0.1245408	0.0360663	0.0432098
EARTH	2073-09-11 13:31	> 1 d	0.0299623	0.0286940	0.0104476
EARTH	2075-08-27 01:15	> 1 w	0.1039007	0.0721941	0.0216477
EARTH	2077-08-06 00:10	> 1 d	0.1500192	0.1389792	0.0159473
EARTH	2096-09-14 20:53	> 1 d	0.1384197	0.0375317	0.1109636
EARTH	2098-09-12 16:11	> 1 d	0.0290021	0.0289807	0.0037384
EARTH	2100-08-29 02:03	> 1 w	0.0980781	0.0643408	0.0709328
EARTH	2102-08-08 23:05	> 1 w	0.1459064	0.1341346	0.0521873
EARTH	2121-09-16 00:53	> 1 d	0.1511155	0.0388752	0.5237168
EARTH	2123-09-14 17:33	> 1 w	0.0320331	0.0295503	0.1926313
EARTH	2125-08-31 18:32	> 1 mo	0.0892734	0.0551642	0.3366004

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
218.15919204	247.99604192	0.02790040	MINIMUM
358.43808366	39.16554739	0.54436511	SADDLE
1.81171775	224.16300618	1.45698195	SADDLE
182.22113627	44.85899083	2.07977556	MAXIMUM

Download:

MOID Plots

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