Asteroids

2021RF16 help

Last update: 2024-04-25 01:36 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.864

Aphelion (Q)

1.727

Eccentricity (e)

0.333

Inclination (i)

4.1

deg

Orbit period (P)

538.7

Earth MOID

0.00021

U parameter

7.4

Next Earth close approach

Date

2047-01-19

Nominal distance (from Earth center)

0.05824

8713076

Maximum Brightness

25.6

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

4 - 10*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-13

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

1.295736

1-sigma variation

0.000425

Unit

Eccentricity (e)

Value

0.332984

1-sigma variation

0.000256

Unit

Inclination (i)

Value

4.0797

1-sigma variation

0.0023

Unit

Long. of Ascending Node (Ω)

Value

353.8946

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

63.6880

1-sigma variation

0.0087

Unit

Mean Anomaly (M)

Value

225.58613

1-sigma variation

0.27880

Unit

Perihelion distance

Value

0.864277

1-sigma variation

Unit

Aphelion distance

Value

1.727195

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.000759

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.357413

1-sigma variation

Unit

MOID

Value

0.000214

1-sigma variation

Unit

Orbit Period

Value

538.7327

1-sigma variation

Unit

U parameter

Value

7.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.80445E-7	1.08604E-7	9.55664E-7	1.29719E-7	-3.60476E-6	-1.18430E-4
e	1.08604E-7	6.54196E-8	5.76864E-7	7.62786E-8	-2.15553E-6	-7.12825E-5
i	9.55664E-7	5.76864E-7	5.11356E-6	6.31388E-7	-1.86586E-5	-6.27331E-4
Ω	1.29719E-7	7.62786E-8	6.31388E-7	1.52762E-7	-3.05316E-6	-8.50221E-5
ω	-3.60476E-6	-2.15553E-6	-1.86586E-5	-3.05316E-6	7.56257E-5	2.36498E-3
M	-1.18430E-4	-7.12825E-5	-6.27331E-4	-8.50221E-5	2.36498E-3	7.77285E-2

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

28.951

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

4 - 10*

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

953

Unit

Source

[1]

Normalized RMS of residuals

Value

0.565991

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-13.428175

Unit

Source

[2]

Last Observation

Value

2021-09-14.94876

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

21 (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 2021RF16 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	1952-12-04 14:12	> 1 mo	0.1202197	0.0844198	0.0523610
EARTH	1972-09-12 03:42	> 1 d	0.0355706	0.0014624	0.0219669
EARTH	1975-12-24 13:55	> 1 w	0.0986943	0.0641954	0.0157250
EARTH	1998-10-09 09:14	> 1 w	0.0903103	0.0167229	0.0347327
EARTH	2002-01-18 21:28	> 1 d	0.0934840	0.0599131	0.0411660
EARTH	2021-09-16 09:18	< 1 min	0.0021297	0.0021249	0.0000016
EARTH	2047-01-19 05:44	> 1 w	0.0582433	0.0581944	0.0028875
EARTH	2049-10-25 13:38	> 1 mo	0.1208260	0.0458033	0.0429420
EARTH	2052-09-05 14:27	> 1 w	0.1336931	0.0025710	0.1423639
EARTH	2078-01-08 06:16	> 1 mo	0.0870386	0.0569900	0.2534784
EARTH	2080-10-01 19:14	> 1 mo	0.0762243	0.0065254	0.3405888
EARTH	2106-01-31 16:50	1100.0	0.1640380	0.0700979	0.0347636
EARTH	2108-12-11 20:28	> 1 mo	0.1281586	0.0745272	0.0276824
EARTH	2111-09-19 04:26	> 1 w	0.0043689	0.0012592	0.1241492
EARTH	2114-09-19 11:26	> 1 mo	0.0087136	0.0012668	7.6240361
EARTH	2117-10-31 11:45	> 1 mo	0.1218364	0.0590711	35.9974502
EARTH	2120-12-22 21:04	> 1 mo	0.1070129	0.0608825	131.5949590
EARTH	2124-01-21 18:18	> 1 mo	0.0798653	0.0579242	259.5725037

Download as:

2021RF16

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2049-09-16.755	69700.755	-1.739	1.64 ± 0.002	1.85E3	2.55E-5	1.22E-7	-6.35
2052-09-16.378	70796.378	-1.684	0.50 ± 0.006	1.71E5	1.81E-6	8.66E-9	-7.55
2052-09-16.486	70796.486	1.579	0.63 ± 0.003	1.43E3	2.47E-4	1.20E-6	-5.41
2053-09-16.628	71161.628	-1.748	0.07 ± 0.506	1.20E8	2.27E-9	1.09E-11	-10.46


Based on 21 optical observations (of which 0 are rejected as outliers) from 2021/09/13.428 to 2021/09/14.949.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.66 and 1.66 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20240110 090432.396 UTC.

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