Asteroids

2021RF12

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

Orbital Properties

Epoch

59400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.875

Aphelion (Q)

2.873

Eccentricity (e)

0.533

Inclination (i)

2.8

deg

Orbit period (P)

937.2

days

Earth MOID

0.00104

Next Earth close approach

Date

2055-05-13

Nominal distance (from Earth center)

0.16082

24057601

Maximum Brightness

126.7

Orbit Visualiser

Click the button to start Orbit Visualiser

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

Diameter

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-12

Observatory

Mt. Lemmon Survey

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

1.87

1-sigma variation

0.00205094

Unit

Eccentricity (e)

Value

0.53310335615472

1-sigma variation

5.6014E-4

Unit

Inclination (i)

Value

2.84

1-sigma variation

2.249E-3

Unit

Ascending Node (Ω)

Value

168.63

1-sigma variation

1.911E-4

Unit

Arg. of Perihelion (ω)

Value

127.27

1-sigma variation

6.839E-4

Unit

Mean Anomaly (M)

Value

348.7

1-sigma variation

1.475E-2

Unit

Perihelion

Value

8.751E-1

1-sigma variation

Unit

Aphelion

Value

2.87

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

9.874E-1

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

7.111E-3

1-sigma variation

Unit

MOID

Value

1.044E-3

1-sigma variation

Unit

Orbit Period

Value

937.22

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.20634E-6	1.14881E-6	4.61134E-6	-3.86036E-7	-9.69015E-7	3.02573E-5
e	1.14881E-6	3.13757E-7	1.25943E-6	-1.05401E-7	-2.65394E-7	8.26380E-6
i	4.61134E-6	1.25943E-6	5.05747E-6	-4.22066E-7	-1.06705E-6	3.31712E-5
Ω	-3.86036E-7	-1.05401E-7	-4.22066E-7	3.65296E-8	7.82637E-8	-2.77512E-6
ω	-9.69015E-7	-2.65394E-7	-1.06705E-6	7.82637E-8	4.67657E-7	-7.01339E-6
M	3.02573E-5	8.26380E-6	3.31712E-5	-2.77512E-6	-7.01339E-6	2.17656E-4

Date of computation: 2021-09-15 12:34 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

27.956

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

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

0.55421

Unit

arcseconds

Source

[1]

First Observation

Value

2021-09-12.321021

Unit

Source

[2]

Last Observation

Value

2021-09-15.33949

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

36 (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 2021RF12 from 1950 to 2150

Body	Date	MJD	Nominal distance (au)	Min possible distance (au)	Stretching (au)	Width (au)	Close approach probability
MARS	1959-08-25.53014	36805.5	0.0236355	0.0156070	1.067E-1	1.416E-6	1.48E-1
EARTH	1962-07-27.97928	37873.0	0.1410918	0.0025207	3.289E-2	1.377E-6	8.17E-1
EARTH	1980-06-07.80137	44397.8	0.0935318	0.0478940	1.420E-1	7.600E-7	4.55E-1
EARTH	1998-05-19.00536	50952.0	0.0707000	0.0479743	2.018E-1	7.813E-7	3.21E-1
EARTH	2021-09-10.72420	59467.7	0.0050254	0.0050122	4.397E-6	3.393E-8	1.00E0
MARS	2049-12-07.81373	69782.8	0.0089239	0.0088653	1.841E-1	1.358E-6	8.91E-2
EARTH	2055-05-13.18939	71765.2	0.1608151	0.0494630	7.580E-1	8.292E-7	8.52E-2
EARTH	2068-05-30.91416	76531.9	0.0607080	0.0496942	1.574E0	8.098E-7	4.10E-2
EARTH	2081-07-21.02777	81331.0	0.1440326	0.0002962	5.057E-1	2.568E-6	1.01E-1
EARTH	2094-09-09.12425	86129.1	0.0165234	0.0005549	5.603E0	7.885E-8	1.19E-2
EARTH	2107-08-19.86394	90855.9	0.1076661	0.0005011	6.397E1	4.130E-7	1.04E-3
EARTH	2120-07-14.59306	95568.6	0.1458812	0.0014309	2.856E1	2.243E-6	1.77E-3
EARTH	2133-06-14.94478	100286.9	0.1053060	0.0505222	1.428E2	8.345E-7	4.50E-4
EARTH	2146-05-25.59311	105014.6	0.0554877	0.0508082	1.756E2	8.369E-7	3.67E-4

Download as:

2021RF12

Date	MJD	σ	Distance ± Width (RE)	Stretching (RE/σ)	IP	Exp. Energy (MT)	PS
2050-09-11.188	70060.188	4.361	0.65 ± 0.001	5.64E5	1.24E-10	3.79E-12	-11.06
2050-09-11.189	70060.189	4.361	0.66 ± 0.001	5.80E5	1.21E-10	3.68E-12	-11.07
2055-09-11.219	71886.219	1.836	0.30 ± 0.001	1.44E4	1.35E-5	4.01E-7	-6.10
2063-09-11.022	74808.022	-1.464	0.05 ± 0.000	2.19E7	1.69E-8	4.84E-10	-9.11
2065-09-10.689	75538.689	-4.409	0.97 ± 0.001	6.94E3	6.54E-9	1.83E-10	-9.55
2068-09-10.524	76634.524	1.220	1.29 ± 0.001	7.91E3	2.03E-5	5.97E-7	-6.07
2070-09-10.936	77364.936	-4.417	0.97 ± 0.001	3.35E6	1.84E-11	5.15E-13	-12.14
2071-09-10.984	77729.984	4.439	0.72 ± 0.001	2.68E5	1.82E-10	5.50E-12	-11.13
2072-09-10.562	78095.562	-1.529	1.19 ± 0.000	4.57E6	3.56E-8	1.02E-9	-8.87
2075-09-11.121	79191.121	-1.547	0.99 ± 0.000	1.29E6	2.45E-7	7.01E-9	-8.05
2075-09-11.179	79191.179	-1.560	0.94 ± 0.027	2.75E7	8.69E-9	2.48E-10	-9.51
2083-09-11.115	82113.115	-4.446	0.22 ± 0.001	5.70E5	9.60E-11	2.67E-12	-11.53
2083-09-11.126	82113.126	4.317	0.73 ± 0.000	3.76E6	2.38E-11	7.20E-13	-12.11
2083-09-11.133	82113.133	-1.579	0.94 ± 0.001	3.27E5	9.30E-7	2.66E-8	-7.54


Based on 36 optical observations (of which 0 are rejected as outliers) from 2021/09/12.321 to 2021/09/15.339.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.35 and 1.36 Earth radii. Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 2.0, Date of computation=20210915 140222.391 UTC.

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