Asteroids

2021RY5 help

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

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.901

Aphelion (Q)

2.153

Eccentricity (e)

0.410

Inclination (i)

4.1

deg

Orbit period (P)

689.0

Earth MOID

0.00468

U parameter

7.4

Next Earth close approach

Date

2038-09-06

Nominal distance (from Earth center)

0.13109

19610973

Maximum Brightness

23.9

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

20 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-08

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.526701

1-sigma variation

0.000663

Unit

Eccentricity (e)

Value

0.410022

1-sigma variation

0.000285

Unit

Inclination (i)

Value

4.1003

1-sigma variation

0.0021

Unit

Long. of Ascending Node (Ω)

Value

0.1336

1-sigma variation

0.0008

Unit

Arg. of Perihelion (ω)

Value

45.8984

1-sigma variation

0.0022

Unit

Mean Anomaly (M)

Value

311.30133

1-sigma variation

0.43414

Unit

Perihelion distance

Value

0.900721

1-sigma variation

Unit

Aphelion distance

Value

2.152682

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.015096

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.780995

1-sigma variation

Unit

MOID

Value

0.004675

1-sigma variation

Unit

Orbit Period

Value

689.0165

1-sigma variation

Unit

U parameter

Value

7.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.39043E-7	1.88618E-7	1.38837E-6	5.37916E-7	-1.47653E-6	-2.87665E-4
e	1.88618E-7	8.10330E-8	5.96472E-7	2.31037E-7	-6.34229E-7	-1.23585E-4
i	1.38837E-6	5.96472E-7	4.39101E-6	1.69788E-6	-4.66395E-6	-9.09676E-4
Ω	5.37916E-7	2.31037E-7	1.69788E-6	6.77186E-7	-1.83873E-6	-3.52445E-4
ω	-1.47653E-6	-6.34229E-7	-4.66395E-6	-1.83873E-6	5.01828E-6	9.67435E-4
M	-2.87665E-4	-1.23585E-4	-9.09676E-4	-3.52445E-4	9.67435E-4	1.88481E-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

25.607

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

20 - 40*

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

1388

Unit

Source

[1]

Normalized RMS of residuals

Value

0.314343

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-08-29.430801

Unit

Source

[2]

Last Observation

Value

2021-09-14.456788

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 2021RY5 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	1962-10-29 03:13	> 1 mo	0.0965316	0.0719036	0.0262620
MARS	1967-01-25 09:36	> 1 d	0.0342073	0.0235489	0.0660208
EARTH	1981-12-12 02:30	> 1 w	0.0773619	0.0702480	0.0264824
EARTH	2000-12-31 00:01	> 1 d	0.1084994	0.0698695	0.0618697
EARTH	2002-09-03 18:32	> 1 d	0.1632079	0.0105208	0.0753400
EARTH	2021-09-18 10:01	< 1 min	0.0089546	0.0089373	0.0000057
EARTH	2038-09-06 11:50	> 1 d	0.1310913	0.0087201	0.0667694
EARTH	2053-12-30 02:33	> 1 w	0.0897094	0.0706062	0.0478210
EARTH	2070-12-14 17:29	> 1 w	0.0780827	0.0711187	0.0211254
EARTH	2087-11-10 19:45	> 1 mo	0.1026977	0.1022537	0.0022015
EARTH	2104-10-09 17:47	> 1 w	0.0697708	0.0144478	0.0474355
EARTH	2121-09-30 12:35	> 1 d	0.0434338	0.0053244	0.0197105

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
326.84895435	255.67993667	0.00466297	MINIMUM
29.26972131	348.32171924	0.07036956	MINIMUM
1.74352753	307.62611549	0.10193018	SADDLE
179.44194068	123.33742832	1.14627028	SADDLE
358.11518656	122.09299575	1.90881934	SADDLE
179.06160503	303.09743235	3.14205444	MAXIMUM

Download:

MOID Plots

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