Asteroids

2021RO16

Last update: 2021-09-17 23:50 UTC

Orbital Properties

Epoch

59400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.871

Aphelion (Q)

1.494

Eccentricity (e)

0.263

Inclination (i)

0.4

deg

Orbit period (P)

469.7

days

Earth MOID

0.00549

Next Earth close approach

Date

2034-04-25

Nominal distance (from Earth center)

0.03003

4492920

Maximum Brightness

122.9

Orbit Visualiser

Click the button to start Orbit Visualiser

Risk

Object is in risk list

Object is in priority list

Physical Properties

Absolute Magnitude (H)

26.6

Diameter

17*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-14

Observatory

ATLAS-MLO, Mauna Loa

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion
Aphelion
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period

Value

1-sigma variation

Unit

Epoch

Value

59400.0

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.18

1-sigma variation

3.28392E-4

Unit

Eccentricity (e)

Value

0.263182018535693

1-sigma variation

2.97456E-4

Unit

Inclination (i)

Value

3.955E-1

1-sigma variation

3.524E-4

Unit

Ascending Node (Ω)

Value

83.35

1-sigma variation

0.17687

Unit

Arg. of Perihelion (ω)

Value

195.58

1-sigma variation

0.180618

Unit

Mean Anomaly (M)

Value

350.94

1-sigma variation

7.427E-3

Unit

Perihelion

Value

8.713E-1

1-sigma variation

Unit

Aphelion

Value

1.49

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

4.879E-1

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-1.371E-1

1-sigma variation

Unit

MOID

Value

5.491E-3

1-sigma variation

Unit

Orbit Period

Value

469.71

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.07841E-7	9.75735E-8	1.15653E-7	-4.63489E-5	4.72808E-5	-2.42789E-6
e	9.75735E-8	8.84801E-8	1.04529E-7	-4.05118E-5	4.13183E-5	-2.18687E-6
i	1.15653E-7	1.04529E-7	1.24178E-7	-5.07078E-5	5.17271E-5	-2.60850E-6
Ω	-4.63489E-5	-4.05118E-5	-5.07078E-5	3.12828E-2	-3.19453E-2	1.11184E-3
ω	4.72808E-5	4.13183E-5	5.17271E-5	-3.19453E-2	3.26227E-2	-1.13467E-3
M	-2.42789E-6	-2.18687E-6	-2.60850E-6	1.11184E-3	-1.13467E-3	5.51658E-5

Date of computation: 2021-09-16 13:20 UTC

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)

Taxononomy

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

26.584

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

Unit

Source

[-]

Diameter

Value

17*

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

[-]

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

**Estimated value

Observational Information

Arc Length
Unobserved

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

days

Source

[1]

Unobserved

Value

Unit

days

Source

[1]

Astrometry Summary

RMS of Residuals
First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

RMS of Residuals

Value

0.531424

Unit

arcseconds

Source

[1]

First Observation

Value

2021-09-14.448731

Unit

Source

[2]

Last Observation

Value

2021-09-16.16602

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

27 (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 2021RO16 from 1950 to 2150

Body	Date	MJD	Nominal distance (au)	Min possible distance (au)	Stretching (au)	Width (au)	Close approach probability
EARTH	1950-04-10.89451	33381.9	0.1498398	0.0068467	4.362E0	7.628E-6	1.53E-2
EARTH	1959-06-22.07075	36741.1	0.1409272	0.0066603	4.386E-2	9.538E-6	7.25E-1
EARTH	1968-09-16.09766	40115.1	0.0800404	0.0067429	4.014E0	1.321E-6	1.66E-2
EARTH	1972-04-13.68950	41420.7	0.0969061	0.0068210	4.342E0	7.838E-6	1.54E-2
EARTH	1981-07-09.47202	44794.5	0.1413656	0.0067415	2.484E-1	4.219E-6	2.57E-1
EARTH	1990-09-20.98554	48155.0	0.1494472	0.0068094	1.198E-1	5.475E-7	5.57E-1
EARTH	1994-04-18.32095	49460.3	0.0388942	0.0068098	7.940E-1	8.057E-6	8.39E-2
EARTH	2003-06-26.02526	52816.0	0.1428199	0.0067727	3.568E-2	1.620E-5	7.77E-1
EARTH	2012-09-10.08478	56180.1	0.0088192	0.0069027	2.269E-2	1.401E-6	1.00E0
EARTH	2021-09-11.21241	59468.2	0.0073444	0.0073196	8.404E-6	1.308E-7	1.00E0
EARTH	2034-04-25.42701	64077.4	0.0300333	0.0034499	2.997E-2	8.521E-6	1.00E0
EARTH	2043-08-21.96584	67483.0	0.0899042	0.0070243	6.896E-2	4.095E-6	7.67E-1
EARTH	2056-05-01.02752	72119.0	0.0611952	0.0034098	1.811E-1	9.298E-6	3.68E-1
EARTH	2065-09-05.19933	75533.2	0.0404244	0.0070037	5.793E-2	1.806E-6	9.61E-1
EARTH	2078-05-02.38188	80155.4	0.0656269	0.0033928	2.888E-1	9.461E-6	2.31E-1
EARTH	2087-08-26.64687	83558.6	0.0788746	0.0070092	2.396E-1	3.399E-6	2.78E-1
EARTH	2100-04-25.99146	88184.0	0.0329748	0.0033961	2.752E-2	8.729E-6	1.00E0
EARTH	2109-09-06.20401	91604.2	0.0381844	0.0070864	2.717E-1	1.564E-6	2.45E-1
EARTH	2122-05-17.66260	96240.7	0.1003135	0.0032822	2.091E-1	1.063E-5	3.19E-1
EARTH	2131-09-07.93484	99640.9	0.0304318	0.0070950	6.261E-1	1.348E-6	1.06E-1
EARTH	2144-04-21.02191	104250.0	0.0039877	0.0032039	2.379E0	8.019E-6	2.80E-2
EARTH	2149-09-19.98290	106228.0	0.0780454	0.0098765	1.230E2	2.316E-5	5.42E-4

Download as:

2021RO16

Date	MJD	σ	Distance ± Width (RE)	Stretching (RE/σ)	IP	Exp. Energy (MT)	PS
2082-04-22.496	81606.496	-0.516	1.29 ± 0.341	6.27E7	1.25E-8	1.60E-9	-8.88
2095-04-25.551	86357.551	-0.502	0.84 ± 0.355	2.10E8	5.08E-9	6.54E-10	-9.35
2105-04-22.666	90006.666	1.323	0.76 ± 0.204	4.74E7	1.12E-8	1.45E-9	-9.06
2113-04-24.121	92930.121	-0.240	0.46 ± 0.301	4.36E7	3.02E-8	3.88E-9	-8.67
2114-04-25.773	93296.773	0.241	0.23 ± 0.000	1.71E8	8.04E-9	1.04E-9	-9.25


Based on 27 optical observations (of which 0 are rejected as outliers) from 2021/09/14.449 to 2021/09/16.166.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.78 and 1.78 Earth radii. Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 2.0, Date of computation=20210916 155321.879 UTC.

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