Asteroids

2021GU2 help

Last update: 2024-04-19 14:36 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.829

Aphelion (Q)

1.295

Eccentricity (e)

0.219

Inclination (i)

26.2

deg

Orbit period (P)

399.8

Earth MOID

0.00470

U parameter

7.7

Next Earth close approach

Date

2042-10-04

Nominal distance (from Earth center)

0.09102

13616665

Maximum Brightness

23.2

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.2

mag

Diameter

24 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-04-05

Observatory

Palomar Mountain--ZTF

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

1.062139

1-sigma variation

0.000411

Unit

Eccentricity (e)

Value

0.219335

1-sigma variation

0.000270

Unit

Inclination (i)

Value

26.2097

1-sigma variation

0.0318

Unit

Long. of Ascending Node (Ω)

Value

194.1578

1-sigma variation

0.0010

Unit

Arg. of Perihelion (ω)

Value

268.1372

1-sigma variation

0.0645

Unit

Mean Anomaly (M)

Value

330.76364

1-sigma variation

0.66083

Unit

Perihelion distance

Value

0.829175

1-sigma variation

Unit

Aphelion distance

Value

1.295103

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.018255

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.005183

1-sigma variation

Unit

MOID

Value

0.004704

1-sigma variation

Unit

Orbit Period

Value

399.8255

1-sigma variation

Unit

U parameter

Value

7.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.68803E-7	1.10816E-7	1.30746E-5	4.10024E-7	2.65129E-5	-2.71508E-4
e	1.10816E-7	7.27508E-8	8.58355E-6	2.69177E-7	1.74049E-5	-1.78240E-4
i	1.30746E-5	8.58355E-6	1.01299E-3	3.17561E-5	2.05339E-3	-2.10294E-2
Ω	4.10024E-7	2.69177E-7	3.17561E-5	9.96051E-7	6.44006E-5	-6.59495E-4
ω	2.65129E-5	1.74049E-5	2.05339E-3	6.44006E-5	4.16432E-3	-4.26442E-2
M	-2.71508E-4	-1.78240E-4	-2.10294E-2	-6.59495E-4	-4.26442E-2	4.36701E-1

Date of computation: 2024-02-21 14:29 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

25.248

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

24 - 50*

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

[-]

Download this part as:

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

1106

Unit

Source

[1]

Normalized RMS of residuals

Value

0.744434

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-04-05.340266

Unit

Source

[2]

Last Observation

Value

2021-04-09.468827

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 2021GU2 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	1951-10-04 01:24	> 1 d	0.1109321	0.0037724	0.1255812
EARTH	1953-03-31 14:11	> 1 d	0.0930491	0.0171527	0.1185343
EARTH	1974-10-09 05:23	632.8	0.0392531	0.0035437	0.0128798
EARTH	1976-04-04 16:10	849.0	0.0654610	0.0167414	0.0194154
EARTH	1985-10-04 13:24	> 1 d	0.0873348	0.0046533	0.0543998
EARTH	1987-04-01 21:01	> 1 d	0.0640551	0.0185495	0.0549427
EARTH	2008-10-11 19:25	1033.7	0.1382670	0.0516196	0.0289304
EARTH	2010-04-08 14:24	1250.3	0.1601185	0.0804598	0.0266787
EARTH	2019-10-07 07:18	172.3	0.0280819	0.0157304	0.0041250
EARTH	2021-04-02 17:39	< 1 min	0.0230656	0.0229791	0.0000288
EARTH	2042-10-04 17:23	> 1 d	0.0910218	0.0037969	0.0714966
EARTH	2044-03-31 15:02	> 1 d	0.0910212	0.0154570	0.0705255
EARTH	2054-10-11 19:24	> 1 d	0.1172044	0.0030105	0.0597252
EARTH	2056-04-06 20:39	> 1 d	0.1176937	0.0165135	0.0548007
EARTH	2077-10-08 07:53	1003.1	0.0138478	0.0041251	0.0191302
EARTH	2079-04-04 18:35	266.1	0.0396925	0.0395686	0.0001894
EARTH	2088-10-03 16:11	> 1 d	0.1102184	0.0040327	0.1537900
EARTH	2090-04-01 08:47	> 1 d	0.0842880	0.0193821	0.1631556
EARTH	2111-10-14 08:45	> 1 d	0.1608990	0.0051234	0.2924791
EARTH	2113-04-10 11:34	> 1 w	0.1851573	0.0156121	0.2863651
EARTH	2122-10-09 15:46	> 1 w	0.0128066	0.0053640	0.2514912
EARTH	2124-04-05 17:31	> 1 d	0.0624532	0.0275025	0.0395645

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