Asteroids

152685 1998MZ help

Last update: 2025-09-25 13:26 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.575

Aphelion (Q)

2.118

Eccentricity (e)

0.573

Inclination (i)

0.1

deg

Orbit period (P)

570.5

Earth MOID

0.00162

U parameter

0.0

Next Earth close approach

Date

2041-11-17

Nominal distance (from Earth center)

0.16872

25239593

Maximum Brightness

18.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.3

mag

Diameter

400 - 800*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1998-06-18

Observatory

Steward Observatory, Kitt Peak-Spacewatch

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.346151

1-sigma variation

1.638E-9

Unit

Eccentricity (e)

Value

0.573027

1-sigma variation

1.876E-8

Unit

Inclination (i)

Value

0.1479

1-sigma variation

2.549E-6

Unit

Long. of Ascending Node (Ω)

Value

122.3017

1-sigma variation

0.0009

Unit

Arg. of Perihelion (ω)

Value

39.2251

1-sigma variation

0.0009

Unit

Mean Anomaly (M)

Value

241.46983

1-sigma variation

4.639E-6

Unit

Perihelion distance

Value

0.574770

1-sigma variation

Unit

Aphelion distance

Value

2.117533

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.355760

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.591319

1-sigma variation

Unit

MOID

Value

0.001617

1-sigma variation

Unit

Orbit Period

Value

570.4786

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.68435E-18	1.44372E-17	-8.83322E-16	-2.50153E-13	2.48725E-13	-4.13089E-15
e	1.44372E-17	3.52090E-16	-4.05511E-15	-1.75930E-12	1.72237E-12	3.48772E-14
i	-8.83322E-16	-4.05511E-15	6.49887E-12	-7.38721E-10	7.38451E-10	1.87126E-12
Ω	-2.50153E-13	-1.75930E-12	-7.38721E-10	7.33597E-7	-7.33604E-7	4.22641E-10
ω	2.48725E-13	1.72237E-12	7.38451E-10	-7.33604E-7	7.33622E-7	-4.31490E-10
M	-4.13089E-15	3.48772E-14	1.87126E-12	4.22641E-10	-4.31490E-10	2.15232E-11

Date of computation: 2025-09-25 13:26 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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.29

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

400 - 800*

Unit

Source

[4]

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

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude
[5]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9961

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.650189

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-06-18.3844

Unit

Source

[2]

Last Observation

Value

2025-09-25.381669

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

475 (10)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2016-11-19

Unit

Source

[3]

Last Observation

Value

2016-11-19

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

2 (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 152685 1998MZ 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	1955-11-27 07:08	< 1 s	0.0363182	0.0363179	0.0000001
EARTH	1962-06-15 22:31	< 1 min	0.0501939	0.0501931	0.0000003
VENUS	1971-10-07 19:01	< 1 min	0.0434724	0.0434715	0.0000003
VENUS	1985-09-14 15:05	< 1 min	0.0254571	0.0254566	0.0000002
EARTH	1991-11-20 12:10	< 1 s	0.1075075	0.1075070	0.0000002
EARTH	1998-06-06 01:37	< 1 s	0.1348426	0.1348421	0.0000002
VENUS	2006-01-05 21:14	< 1 min	0.0257644	0.0257641	0.0000001
MARS	2015-03-11 07:00	< 1 s	0.0212585	0.0212583	0.0000000
EARTH	2016-11-20 00:47	< 1 s	0.1060375	0.1060375	0.0000000
EARTH	2023-06-07 15:02	< 1 s	0.1171359	0.1171356	0.0000001
VENUS	2029-08-07 01:49	< 1 min	0.0325292	0.0325288	0.0000001
MARS	2029-10-18 02:22	< 1 s	0.0473669	0.0473667	0.0000001
EARTH	2041-11-17 11:13	< 1 s	0.1687163	0.1687155	0.0000002
EARTH	2055-12-03 06:21	< 1 s	0.1285886	0.1285880	0.0000002
EARTH	2062-06-17 15:54	< 1 s	0.0690594	0.0690592	0.0000001
EARTH	2080-11-28 11:18	< 1 min	0.0559509	0.0559503	0.0000002
EARTH	2087-06-17 01:01	< 1 min	0.0494115	0.0494108	0.0000002
VENUS	2090-07-05 21:05	< 1 min	0.0203191	0.0203190	0.0000000
VENUS	2107-09-25 06:22	< 1 min	0.0299248	0.0299217	0.0000010
EARTH	2116-11-26 23:26	< 1 min	0.0027459	0.0027449	0.0000003

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
64.76092690	161.09176337	0.00161655	MINIMUM
297.73746300	322.39235987	0.00213668	MINIMUM
2.17923621	62.87680650	0.41772304	SADDLE
180.59079205	240.93842583	1.10828936	SADDLE
2.21417915	242.91908587	1.58375350	SADDLE
180.58055864	60.92616257	3.10976929	MAXIMUM

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MOID Plots

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