Asteroids

162421 2000ET70 help

Last update: 2025-07-29 08:01 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Aten

Perihelion (q)

0.829

Aphelion (Q)

1.064

Eccentricity (e)

0.124

Inclination (i)

22.3

deg

Orbit period (P)

336.4

Earth MOID

0.02988

U parameter

0.0

Next Earth close approach

Date

2035-02-19

Nominal distance (from Earth center)

0.13306

19905113

Maximum Brightness

16.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.2

mag

Diameter

2600 | 2200 | 2100

Taxonomic type

Rotation period (T)

8.947

Discovery Information

Discovery Date

2000-03-08

Observatory

Lincoln Laboratory ETS, New Mexico

ORBIT VISUALISATION TOOLS

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.946638

1-sigma variation

5.270E-10

Unit

Eccentricity (e)

Value

0.123826

1-sigma variation

4.604E-8

Unit

Inclination (i)

Value

22.3232

1-sigma variation

1.211E-6

Unit

Long. of Ascending Node (Ω)

Value

331.1149

1-sigma variation

7.762E-7

Unit

Arg. of Perihelion (ω)

Value

46.0526

1-sigma variation

8.707E-6

Unit

Mean Anomaly (M)

Value

245.53657

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.829420

1-sigma variation

Unit

Aphelion distance

Value

1.063857

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.152207

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.030686

1-sigma variation

Unit

MOID

Value

0.029877

1-sigma variation

Unit

Orbit Period

Value

336.4144

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.77715E-19	-8.31993E-18	2.55472E-17	-1.01442E-16	-1.89578E-15	5.57531E-16
e	-8.31993E-18	2.12009E-15	-1.37786E-14	2.91480E-14	3.90459E-13	-6.52730E-13
i	2.55472E-17	-1.37786E-14	1.46650E-12	-7.01585E-13	-1.75965E-12	4.37626E-12
Ω	-1.01442E-16	2.91480E-14	-7.01585E-13	6.02455E-13	5.06775E-12	-9.05176E-12
ω	-1.89578E-15	3.90459E-13	-1.75965E-12	5.06775E-12	7.58131E-11	-1.20476E-10
M	5.57531E-16	-6.52730E-13	4.37626E-12	-9.05176E-12	-1.20476E-10	2.20791E-10

Date of computation: 2025-07-29 08:01 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

8.947

Unit

Source

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

0.6

Unit

mag

Source

[3]

Rotation Direction

Value

RETRO

Unit

Source

[1]

Spinvector L

Value

Unit

Source

[1]

Spinvector B

Value

-50

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.163

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.065

Unit

Source

[6]

Diameter

Value

2600 | 2200 | 2100

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[7]

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Sources

No.	Name	Additional
[1]	EARN	1.) Naidu, S.P. et al. (2013) Icarus 226, 323-335. (Radar imaging and physical characterization of near-Earth Asteroid (162421) 2000 ET70)
[2]	EARN	1.) Whiteley, R.J. (2001) PhD. Thesis, University of Hawaii. (A Compositional and Dynamical Survey of the Near-Earth Asteroids)
[3]	EARN	1.) Alvarez, E.M. & J.Oey (2012) MPB 39, 170. (PERIOD DETERMINATION FOR NEA (162421) 2000 ET70) 2.) Naidu, S.P. et al. (2013) Icarus 226, 323-335. (Radar imaging and physical characterization of near-Earth Asteroid (162421) 2000 ET70)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Naidu, S.P. et al. (2013) Icarus 226, 323-335. (Radar imaging and physical characterization of near-Earth Asteroid (162421) 2000 ET70) 2.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs) 3.) Marshall, S.E.; Howell, E.S.; Magri, C.; Vervack Jr., R.J.; et al. (2017) Icarus 292, 22-35. (Thermal properties and an improved shape model for near-Earth asteroid (162421) 2000 ET70)
[6]	EARN	1.) Marshall, S.E.; Howell, E.S.; Magri, C.; Vervack Jr., R.J.; et al. (2017) Icarus 292, 22-35. (Thermal properties and an improved shape model for near-Earth asteroid (162421) 2000 ET70) 2.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)
[7]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Naidu, S. et al. (2012) DPS 44 302-06. (abstract) (Radar Observations and Shape Modeling of Near-Earth Asteroid (162421) 2000 ET70) 3.) Naidu, S.P. et al. (2013) Icarus 226, 323-335. (Radar imaging and physical characterization of near-Earth Asteroid (162421) 2000 ET70)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

17690

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.458813

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1977-02-18.3079

Unit

Source

[2]

Last Observation

Value

2025-07-26.60853

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

690 (11)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2012-02-12

Unit

Source

[3]

Last Observation

Value

2012-08-24

Unit

Source

[3]

Delay (Discarded)

Value

18 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

18 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	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 162421 2000ET70 from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1965-02-18 19:53	< 1 s	0.0574538	0.0574536	0.0000001
EARTH	1965-08-31 02:15	< 1 min	0.1709174	0.1709171	0.0000001
EARTH	1977-02-19 07:12	< 1 s	0.0722049	0.0722045	0.0000001
EARTH	1977-08-17 20:34	< 1 min	0.1506963	0.1506962	0.0000000
EARTH	2000-02-19 19:41	< 1 s	0.0938176	0.0938174	0.0000001
EARTH	2000-09-04 10:35	< 1 min	0.1895191	0.1895187	0.0000001
EARTH	2012-02-19 20:37	< 1 s	0.0454431	0.0454431	0.0000000
EARTH	2012-08-21 01:40	< 1 min	0.1503278	0.1503277	0.0000000
EARTH	2024-02-22 12:34	< 1 s	0.1886017	0.1886015	0.0000001
EARTH	2024-08-04 08:38	< 1 min	0.1978656	0.1978653	0.0000001
EARTH	2035-02-19 20:55	< 1 s	0.1330575	0.1330571	0.0000001
EARTH	2047-02-19 09:32	< 1 s	0.0426285	0.0426282	0.0000001
EARTH	2047-08-29 19:55	< 1 min	0.1645293	0.1645290	0.0000001
EARTH	2059-02-19 09:19	< 1 s	0.0369404	0.0369401	0.0000001
EARTH	2059-08-29 01:21	< 1 min	0.1614275	0.1614273	0.0000001
EARTH	2071-02-19 12:28	< 1 s	0.0962169	0.0962159	0.0000003
EARTH	2071-09-06 23:03	< 1 min	0.1961032	0.1961028	0.0000001
EARTH	2096-02-20 14:27	< 1 s	0.0906158	0.0906148	0.0000003
EARTH	2096-08-17 04:37	< 1 min	0.1503754	0.1503752	0.0000000
EARTH	2108-02-20 15:58	< 1 s	0.0477930	0.0477925	0.0000002
EARTH	2108-08-31 20:08	< 1 min	0.1690132	0.1690131	0.0000000

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
127.48217154	47.26160878	0.02987685	MINIMUM
314.84593423	225.60775241	0.14991921	MINIMUM
36.72664104	316.72374381	0.37994688	SADDLE
226.13604393	135.22929541	0.39470326	SADDLE
9.09993026	104.29990017	1.81114313	SADDLE
159.37545657	254.00632785	2.05242081	MAXIMUM

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MOID Plots

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