Asteroids

2021HU

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

Orbital Properties

Epoch

59400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.877

Aphelion (Q)

2.287

Eccentricity (e)

0.446

Inclination (i)

6.9

deg

Orbit period (P)

726.6

days

Earth MOID

0.01808

Next Earth close approach

Date

2023-04-22

Nominal distance (from Earth center)

0.05267

7879427

Maximum Brightness

121.8

Orbit Visualiser

Click the button to start Orbit Visualiser

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.3

Diameter

30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-04-17

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

1.58

1-sigma variation

7.08496E-4

Unit

Eccentricity (e)

Value

0.445807931462792

1-sigma variation

2.89695E-4

Unit

Inclination (i)

Value

6.93

1-sigma variation

3.296E-3

Unit

Ascending Node (Ω)

Value

44.87

1-sigma variation

1.710E-4

Unit

Arg. of Perihelion (ω)

Value

225.13

1-sigma variation

7.809E-4

Unit

Mean Anomaly (M)

Value

13.55

1-sigma variation

6.464E-3

Unit

Perihelion

Value

8.766E-1

1-sigma variation

Unit

Aphelion

Value

2.29

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

8.564E-1

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-4.439E-2

1-sigma variation

Unit

MOID

Value

1.808E-2

1-sigma variation

Unit

Orbit Period

Value

726.57

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.01966E-7	2.05247E-7	2.33539E-6	1.14141E-7	5.51115E-7	-4.57971E-6
e	2.05247E-7	8.39230E-8	9.54910E-7	4.66866E-8	2.25364E-7	-1.87259E-6
i	2.33539E-6	9.54910E-7	1.08656E-5	5.30568E-7	2.56441E-6	-2.13070E-5
Ω	1.14141E-7	4.66866E-8	5.30568E-7	2.92578E-8	1.26652E-7	-1.04271E-6
ω	5.51115E-7	2.25364E-7	2.56441E-6	1.26652E-7	6.09823E-7	-5.02982E-6
M	-4.57971E-6	-1.87259E-6	-2.13070E-5	-1.04271E-6	-5.02982E-6	4.17841E-5

Date of computation: 2021-04-29 13:23 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

25.316

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

30*

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

0.381762

Unit

arcseconds

Source

[1]

First Observation

Value

2021-04-08.499733

Unit

Source

[2]

Last Observation

Value

2021-04-27.83815

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

48 (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 2021HU from 1950 to 2150

Body	Date	MJD	Nominal distance (au)	Min possible distance (au)	Stretching (au)	Width (au)	Close approach probability
EARTH	2007-09-01.23594	54344.2	0.1874515	0.1200419	5.482E-2	2.512E-7	5.49E-1
EARTH	2009-08-24.49933	55067.5	0.1291092	0.1200142	4.483E-2	2.486E-7	9.19E-1
EARTH	2011-08-13.27152	55786.3	0.1267369	0.1200546	3.287E-2	2.379E-7	1.00E0
EARTH	2013-07-21.06668	56494.1	0.1569833	0.1321838	1.642E-2	2.797E-7	1.00E0
EARTH	2015-06-27.74677	57200.7	0.1648031	0.1606562	8.053E-3	5.109E-7	1.00E0
EARTH	2017-06-04.07626	57908.1	0.1434074	0.1233965	7.709E-3	3.803E-7	1.00E0
EARTH	2019-05-14.06258	58617.1	0.0922245	0.0720142	6.365E-3	1.915E-7	1.00E0
EARTH	2021-04-29.45313	59333.5	0.0249368	0.0248939	1.431E-5	2.810E-8	1.00E0
EARTH	2023-04-22.83477	60056.8	0.0526707	0.0190845	8.181E-3	1.019E-7	1.00E0
EARTH	2025-04-15.91507	60780.9	0.1326756	0.0798122	1.433E-2	9.713E-8	1.00E0
EARTH	2132-09-03.98194	100003.0	0.1991844	0.1187281	2.197E-1	2.478E-7	2.44E-1
EARTH	2134-08-28.76211	100726.8	0.1354694	0.1187548	2.068E-1	2.468E-7	2.59E-1
EARTH	2136-08-18.56596	101447.6	0.1210900	0.1187544	1.847E-1	2.399E-7	2.90E-1
EARTH	2138-07-30.95224	102159.0	0.1500534	0.1187479	1.298E-1	2.361E-7	3.94E-1
EARTH	2140-07-06.34782	102865.3	0.1670272	0.1428014	7.232E-2	4.549E-7	5.13E-1
EARTH	2142-06-14.42564	103573.4	0.1564176	0.0154196	8.017E-2	4.586E-7	6.19E-1
EARTH	2144-05-24.33370	104283.3	0.1209116	0.0155344	1.259E-1	2.615E-7	5.15E-1
EARTH	2146-05-07.14616	104996.1	0.0570099	0.0152537	1.630E-1	1.401E-7	4.07E-1
EARTH	2148-04-27.05469	105717.1	0.0213293	0.0152927	1.335E-1	1.070E-7	4.98E-1

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