Asteroids

2021RF2 help

Last update: 2024-05-09 16:35 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.679

Aphelion (Q)

1.089

Eccentricity (e)

0.231

Inclination (i)

4.2

deg

Orbit period (P)

303.6

Earth MOID

0.00601

U parameter

6.5

Next Earth close approach

Date

2026-10-04

Nominal distance (from Earth center)

0.06502

9726809

Maximum Brightness

23.6

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.8

mag

Diameter

18 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-04

Observatory

Pan-STARRS 1, Haleakala

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.883956

1-sigma variation

0.000043

Unit

Eccentricity (e)

Value

0.231471

1-sigma variation

0.000109

Unit

Inclination (i)

Value

4.1845

1-sigma variation

0.0025

Unit

Long. of Ascending Node (Ω)

Value

5.1018

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

139.9570

1-sigma variation

0.0028

Unit

Mean Anomaly (M)

Value

243.55513

1-sigma variation

0.08620

Unit

Perihelion distance

Value

0.679346

1-sigma variation

Unit

Aphelion distance

Value

1.088566

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.015421

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.286729

1-sigma variation

Unit

MOID

Value

0.006013

1-sigma variation

Unit

Orbit Period

Value

303.5597

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.87263E-9	-4.70023E-9	-1.06668E-7	1.05888E-8	-1.19520E-7	-3.73030E-6
e	-4.70023E-9	1.17974E-8	2.67733E-7	-2.65773E-8	2.99984E-7	9.36293E-6
i	-1.06668E-7	2.67733E-7	6.07601E-6	-6.03183E-7	6.80786E-6	2.12484E-4
Ω	1.05888E-8	-2.65773E-8	-6.03183E-7	6.00256E-8	-6.75988E-7	-2.10930E-5
ω	-1.19520E-7	2.99984E-7	6.80786E-6	-6.75988E-7	7.62925E-6	2.38083E-4
M	-3.73030E-6	9.36293E-6	2.12484E-4	-2.10930E-5	2.38083E-4	7.43082E-3

Date of computation: 2024-04-23 10:08 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

25.813

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

18 - 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 ODIM	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

950

Unit

Source

[1]

Normalized RMS of residuals

Value

0.702177

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-04.591336

Unit

Source

[2]

Last Observation

Value

2021-10-03.16276

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

46 (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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2021RF2 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1954-08-13 13:05	> 1 w	0.0862476	0.0860815	0.0006052
EARTH	1963-07-09 16:33	588.7	0.1225305	0.0857168	0.0137491
EARTH	1968-10-02 05:03	475.2	0.0082179	0.0050891	0.0023178
EARTH	1973-10-02 23:05	140.8	0.1792187	0.1672689	0.0039835
EARTH	1982-07-08 17:12	162.1	0.1782001	0.1658981	0.0041350
VENUS	1986-05-29 08:59	> 1 d	0.0427874	0.0426168	0.0002052
EARTH	1987-07-19 17:18	1168.2	0.0793239	0.0770425	0.0008438
EARTH	1992-09-24 03:11	178.1	0.0450742	0.0444586	0.0002055
EARTH	1997-10-04 17:05	62.1	0.1005341	0.0936035	0.0023108
VENUS	2007-12-15 13:38	> 1 d	0.0430030	0.0429979	0.0000469
EARTH	2011-07-06 21:49	26.2	0.0963817	0.0893831	0.0024671
EARTH	2016-08-10 05:47	1287.4	0.0904288	0.0903649	0.0000308
EARTH	2021-09-30 11:59	< 1 min	0.0187805	0.0187511	0.0000098
EARTH	2026-10-04 20:19	1.9	0.0650197	0.0587531	0.0020901
VENUS	2027-01-03 18:30	> 1 d	0.0408173	0.0407170	0.0001120
EARTH	2031-10-02 13:55	92.2	0.1818218	0.1741746	0.0025492
VENUS	2043-07-22 20:41	965.0	0.0315558	0.0313508	0.0002636
EARTH	2045-07-07 08:42	89.6	0.1828703	0.1732236	0.0032344
EARTH	2050-07-05 16:17	95.8	0.0905668	0.0827369	0.0029012
EARTH	2055-07-14 21:58	> 1 d	0.0766611	0.0736797	0.0014103
VENUS	2060-02-29 13:43	> 1 d	0.0318120	0.0308957	0.0019059
EARTH	2060-08-15 04:21	> 1 d	0.0896503	0.0882727	0.0006140
EARTH	2065-09-19 19:09	> 1 d	0.0547594	0.0224180	0.0116840
EARTH	2070-10-02 13:04	> 1 d	0.0078708	0.0072636	0.0056221
VENUS	2079-04-01 10:11	> 1 mo	0.0327851	0.0314066	0.1392642
VENUS	2081-11-01 21:44	> 1 mo	0.0487345	0.0452566	0.3580226
EARTH	2084-07-05 18:26	> 1 w	0.1206548	0.0688021	1.0691341
EARTH	2089-07-27 13:55	> 1 mo	0.0827360	0.0757138	0.4312143
EARTH	2094-09-23 20:16	> 1 mo	0.0439350	0.0121322	1.9117136
EARTH	2099-10-04 07:23	> 1 w	0.0980559	0.0103165	1.1214749
VENUS	2100-10-28 05:25	> 1 mo	0.0426506	0.0400363	0.1822550
EARTH	2113-07-07 07:59	> 1 mo	0.1546208	0.0690911	3.9106203
EARTH	2118-07-10 18:47	> 1 mo	0.0684387	0.0683027	0.3153040
VENUS	2119-11-11 12:58	> 1 mo	0.0339198	0.0318218	1.8737348
EARTH	2123-08-23 06:53	> 1 mo	0.0874769	0.0796011	1.3148951

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