Asteroids

2019GK21

Last update: 2023-03-30 21:00 UTC

Orbital Properties

Epoch

60000.0

MJD

Orbit type

Aten

Perihelion (q)

0.568

Aphelion (Q)

1.154

Eccentricity (e)

0.340

Inclination (i)

5.9

deg

Orbit period (P)

291.7

Earth MOID

0.00272

U parameter

5.8

Next Earth close approach

Date

2023-04-13

Nominal distance (from Earth center)

0.03891

5820758

Maximum Brightness

120.8

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.7

mag

Diameter

26*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2019-04-14

Observatory

Catalina Sky Survey

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)
Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion
Aphelion
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

60000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.860740

1-sigma variation

0.000014

Unit

Eccentricity (e)

Value

0.340188

1-sigma variation

0.000082

Unit

Inclination (i)

Value

5.9247

1-sigma variation

0.0019

Unit

Ascending Node (Ω)

Value

19.5301

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

46.6449

1-sigma variation

0.0006

Unit

Mean Anomaly (M)

Value

48.58409

1-sigma variation

0.03438

Unit

Perihelion

Value

0.567926

1-sigma variation

Unit

Aphelion

Value

1.153554

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.381873

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.008417

1-sigma variation

Unit

MOID

Value

0.002721

1-sigma variation

Unit

Orbit Period

Value

291.6798

1-sigma variation

Unit

U parameter

Value

5.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.99452E-10	-1.16372E-9	-2.72258E-8	-4.51436E-11	8.51477E-9	-4.85550E-7
e	-1.16372E-9	6.79253E-9	1.58908E-7	1.72235E-10	-4.95623E-8	2.83263E-6
i	-2.72258E-8	1.58908E-7	3.71765E-6	4.38941E-9	-1.15989E-6	6.62712E-5
Ω	-4.51436E-11	1.72235E-10	4.38941E-9	3.91207E-9	-6.35568E-9	1.21998E-7
ω	8.51477E-9	-4.95623E-8	-1.15989E-6	-6.35568E-9	3.68957E-7	-2.07446E-5
M	-4.85550E-7	2.83263E-6	6.62712E-5	1.21998E-7	-2.07446E-5	1.18208E-3

Date of computation: 2022-11-23 04:56 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

25.651

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

26*

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

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

1424

Unit

Source

[1]

Astrometry Summary

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

Optical

Value

Unit

Source

RMS of Residuals

Value

0.608759

Unit

arcsec

Source

[1]

First Observation

Value

2019-04-14.15324

Unit

Source

[2]

Last Observation

Value

2019-05-07.264472

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

76 (2)

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 2019GK21 from 1950 to 2123

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1950-07-09 22:00	> 1 w	0.1099451	0.1098204	0.0246079
EARTH	1961-04-12 07:56	> 1 w	0.1376542	0.0021783	0.2999839
EARTH	1965-04-14 05:11	> 1 w	0.0518424	0.0012302	0.1035942
VENUS	1966-09-22 13:19	> 1 d	0.0330108	0.0239740	0.0327265
VENUS	1968-11-26 16:23	> 1 w	0.0170004	0.0056471	0.1153461
EARTH	1969-05-20 05:37	> 1 w	0.1571804	0.1280871	0.0162837
EARTH	1973-06-22 15:57	> 1 w	0.1439542	0.1197355	0.0234284
EARTH	1977-07-10 13:32	984.7	0.1131644	0.1100246	0.0096578
VENUS	1985-10-18 07:41	> 1 d	0.0374546	0.0228110	0.0197924
EARTH	1988-04-13 13:29	> 1 d	0.1975845	0.1042323	0.0311185
EARTH	1992-04-10 05:29	1274.4	0.0702598	0.0005089	0.0426618
EARTH	1996-04-11 23:57	> 1 d	0.0365298	0.0000883	0.0388232
VENUS	1999-04-28 20:29	> 1 d	0.0331289	0.0222707	0.0172548
EARTH	2000-05-04 07:13	> 1 d	0.1349045	0.1193065	0.0052156
VENUS	2001-07-04 10:26	157.6	0.0058628	0.0053621	0.0007912
EARTH	2004-06-17 10:24	597.8	0.1495717	0.1481581	0.0004761
EARTH	2008-07-09 22:49	31.0	0.1337779	0.1315503	0.0007586
EARTH	2019-04-11 09:49	< 1 min	0.0030474	0.0030446	0.0000009
EARTH	2023-04-13 04:46	54.9	0.0389094	0.0373080	0.0005338
VENUS	2023-12-10 07:07	35.7	0.0467653	0.0447295	0.0006817
EARTH	2027-04-18 10:19	121.5	0.0813928	0.0799496	0.0004811
EARTH	2031-04-28 01:44	136.8	0.1179181	0.1170423	0.0002920
VENUS	2034-02-12 05:00	13.8	0.0151456	0.0149160	0.0000766
EARTH	2035-05-07 13:15	28.8	0.1422342	0.1419096	0.0001082
EARTH	2039-05-11 01:49	177.4	0.1484645	0.1482853	0.0000598
VENUS	2042-02-09 13:36	84.1	0.0116480	0.0083212	0.0011112
EARTH	2043-05-21 03:14	727.0	0.1576408	0.1572925	0.0001188
EARTH	2047-06-12 01:45	> 1 d	0.1566847	0.1519380	0.0016733
EARTH	2051-07-04 23:17	> 1 d	0.1232368	0.1093474	0.0061664
VENUS	2053-06-18 02:57	> 1 d	0.0217380	0.0185653	0.0118459
EARTH	2055-07-12 04:27	343.8	0.1102268	0.1051105	0.0097068
VENUS	2055-08-26 16:58	> 1 d	0.0329278	0.0013584	0.0420629
EARTH	2059-07-10 10:25	1428.8	0.1677577	0.1115248	0.0244978
VENUS	2067-01-01 14:20	> 1 d	0.0348060	0.0184946	0.0282262
EARTH	2074-04-13 13:19	250.6	0.1682673	0.1288821	0.0131326
EARTH	2078-04-11 12:35	669.8	0.0920648	0.0041634	0.0317690
EARTH	2082-04-10 20:36	608.5	0.0200735	0.0041647	0.0381349
EARTH	2086-04-11 00:08	994.4	0.0083687	0.0039902	0.0501912
EARTH	2090-04-12 06:03	> 1 w	0.1169817	0.0024711	0.3595576
EARTH	2103-07-14 01:50	> 1 w	0.1578905	0.1019152	0.8103325
EARTH	2107-07-15 04:31	> 1 w	0.1037825	0.1034895	0.0519754
EARTH	2111-06-24 16:39	> 1 mo	0.1500726	0.1209739	0.1385375
VENUS	2114-02-07 12:39	> 1 w	0.0439423	0.0010523	0.3201852
EARTH	2115-05-25 20:26	> 1 w	0.1657610	0.0818718	0.0303309
EARTH	2119-04-26 10:32	> 1 mo	0.1133250	0.0241627	0.2109833
EARTH	2123-04-11 22:18	> 1 w	0.0081011	0.0040215	0.6383881

Download as:

2019GK21

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2092-04-08.192	85245.192	-0.918	1.08 ± 0.089	5.31E7	1.17E-8	6.30E-9	-8.47
2099-04-08.926	87801.926	0.830	0.35 ± 0.026	6.77E5	1.28E-6	6.89E-7	-6.47
2103-04-09.975	89262.975	-0.589	1.20 ± 0.020	1.85E6	4.21E-7	2.26E-7	-6.98
2103-04-10.043	89263.043	3.157	0.79 ± 0.031	2.62E5	2.83E-8	1.52E-8	-8.15
2120-04-09.024	95472.024	0.828	0.75 ± 0.020	1.77E6	4.98E-7	2.69E-7	-6.99


Based on 76 optical observations (of which 2 are rejected as outliers) from 2019/04/14.153 to 2019/05/07.264.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.57 and 1.57 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20220731 182853.769 UTC.

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