Asteroids

2021GK1

Last update: 2021-05-10 03:03 UTC

Orbital Properties

Epoch

59400.0

MJD

Orbit type

Apollo

Perihelion (q)

1.005

Aphelion (Q)

1.179

Eccentricity (e)

0.079

Inclination (i)

1.3

deg

Orbit period (P)

416.8

days

Earth MOID

0.00461

Next Earth close approach

Date

2021-05-11

Nominal distance (from Earth center)

0.00379

567344

Maximum Brightness

20.7

Orbit Visualiser

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Risk

Object is not in risk list

Object is in priority list

Physical Properties

Absolute Magnitude (H)

27.1

Diameter

13*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-04-03

Observatory

Pan-STARRS 1, Haleakala

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

1.09

1-sigma variation

5.61035E-6

Unit

Eccentricity (e)

Value

0.079243924567144

1-sigma variation

5.21161E-6

Unit

Inclination (i)

Value

1.28

1-sigma variation

6.690E-5

Unit

Ascending Node (Ω)

Value

237.38

1-sigma variation

1.359E-3

Unit

Arg. of Perihelion (ω)

Value

9.062E-1

1-sigma variation

1.576E-3

Unit

Mean Anomaly (M)

Value

40.66

1-sigma variation

2.810E-3

Unit

Perihelion

Value

1.01

1-sigma variation

Unit

Aphelion

Value

1.18

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-6.053E-3

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.894E-1

1-sigma variation

Unit

MOID

Value

4.609E-3

1-sigma variation

Unit

Orbit Period

Value

416.81

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.14760E-11	2.92388E-11	-3.74056E-10	7.58621E-9	8.84219E-9	-1.57539E-8
e	2.92388E-11	2.71608E-11	-3.47555E-10	7.04891E-9	8.21368E-9	-1.46358E-8
i	-3.74056E-10	-3.47555E-10	4.47622E-9	-9.08801E-8	-1.04987E-7	1.87769E-7
Ω	7.58621E-9	7.04891E-9	-9.08801E-8	1.84774E-6	2.12878E-6	-3.81174E-6
ω	8.84219E-9	8.21368E-9	-1.04987E-7	2.12878E-6	2.48496E-6	-4.42440E-6
M	-1.57539E-8	-1.46358E-8	1.87769E-7	-3.81174E-6	-4.42440E-6	7.89675E-6

Date of computation: 2021-05-06 13:05 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

27.105

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

13*

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

0.624941

Unit

arcseconds

Source

[1]

First Observation

Value

2021-03-15.437772

Unit

Source

[2]

Last Observation

Value

2021-05-05.901354

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

105 (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 2021GK1 from 1950 to 2150

Body	Date	MJD	Nominal distance (au)	Min possible distance (au)	Stretching (au)	Width (au)	Close approach probability
EARTH	1952-05-01.93967	34133.9	0.0694619	0.0032951	1.163E-1	6.092E-9	5.73E-1
EARTH	1952-10-01.99092	34287.0	0.1208866	0.0029816	5.817E-2	3.510E-8	7.27E-1
EARTH	1961-01-10.51917	37309.5	0.1771932	0.1585685	6.445E-3	4.545E-8	1.00E0
EARTH	1969-05-01.49285	40342.5	0.0735686	0.0240118	1.097E-2	6.368E-9	1.00E0
EARTH	1969-10-05.97124	40500.0	0.1223437	0.1062951	5.014E-3	3.241E-8	1.00E0
EARTH	1978-02-17.88105	43556.9	0.1381757	0.0622415	1.852E-2	5.468E-8	1.00E0
EARTH	1978-08-10.66166	43730.7	0.1114149	0.0034572	4.950E-2	5.277E-8	7.98E-1
EARTH	1986-12-03.53312	46767.5	0.1791921	0.1700803	3.223E-3	2.236E-8	1.00E0
EARTH	1995-06-17.75810	49885.8	0.0103061	0.0099952	1.375E-4	3.202E-8	1.00E0
EARTH	2004-01-11.56677	53015.6	0.1674260	0.1670825	1.190E-4	3.777E-8	1.00E0
EARTH	2012-11-12.90057	56243.9	0.1719543	0.1717615	6.642E-5	2.179E-8	1.00E0
EARTH	2021-05-11.72384	59345.7	0.0037925	0.0037916	2.997E-7	8.771E-9	1.00E0
EARTH	2029-04-08.20208	62234.2	0.1366805	0.1355269	3.842E-4	1.785E-8	1.00E0
EARTH	2029-09-27.28326	62406.3	0.1460588	0.1456828	1.402E-4	9.656E-8	1.00E0
EARTH	2037-11-14.89280	65376.9	0.1851198	0.1850430	7.957E-5	2.611E-8	1.00E0
EARTH	2045-12-29.43588	68343.4	0.1730112	0.1727103	1.274E-4	3.131E-8	1.00E0
EARTH	2054-02-27.36974	71325.4	0.1067888	0.1058968	2.975E-4	1.186E-7	1.00E0
EARTH	2054-07-07.94796	71455.9	0.0514960	0.0501574	4.596E-4	9.087E-8	1.00E0
EARTH	2062-02-07.58826	74227.6	0.1347690	0.1317230	1.032E-3	1.015E-7	1.00E0
EARTH	2062-07-14.07026	74384.1	0.1027192	0.0957777	2.265E-3	1.009E-7	1.00E0
EARTH	2070-01-01.19697	77112.2	0.1800355	0.1789031	4.649E-4	3.672E-8	1.00E0
EARTH	2077-11-28.57823	80000.6	0.1967407	0.1967126	2.052E-4	3.969E-8	1.00E0
EARTH	2085-10-26.01977	82889.0	0.1829044	0.1825095	1.653E-4	4.620E-8	1.00E0
EARTH	2093-04-11.10484	85613.1	0.1151042	0.1144388	2.221E-4	1.529E-8	1.00E0
EARTH	2093-09-18.71810	85773.7	0.1399464	0.1397009	9.089E-5	1.010E-7	1.00E0
EARTH	2101-04-19.36109	88542.4	0.0447763	0.0421584	8.585E-4	1.243E-8	1.00E0
EARTH	2101-08-24.06459	88669.1	0.1033479	0.1016645	5.780E-4	1.105E-7	1.00E0
EARTH	2109-11-02.00073	91661.0	0.1769478	0.1748008	1.228E-3	8.946E-9	1.00E0
EARTH	2117-12-22.05854	94633.1	0.1792372	0.1745536	2.305E-3	2.560E-8	1.00E0
EARTH	2126-02-24.78624	97619.8	0.1114739	0.0811908	8.776E-3	1.169E-7	1.00E0
EARTH	2126-07-12.10882	97757.1	0.0592956	0.0031410	1.505E-2	9.566E-8	1.00E0
EARTH	2134-07-07.38572	100674.4	0.0374190	0.0017598	4.429E-2	8.735E-8	1.00E0
EARTH	2141-12-13.35006	103390.4	0.1989279	0.0306990	5.327E-2	2.890E-8	5.05E-1
EARTH	2149-04-11.80164	106066.8	0.1682642	0.0015199	6.688E-1	1.529E-8	9.96E-2
EARTH	2149-10-04.85182	106242.9	0.1606453	0.0006343	2.362E-1	8.662E-8	2.62E-1

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