Asteroids

199145 2005YY128 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.441

Aphelion (Q)

2.856

Eccentricity (e)

0.732

Inclination (i)

3.8

deg

Orbit period (P)

773.2

Earth MOID

0.02963

U parameter

0.0

Next Earth close approach

Date

2029-09-26

Nominal distance (from Earth center)

0.05951

8903114

Maximum Brightness

15.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.3

mag

Diameter

600 - 1300*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2005-12-30

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

1.648588

1-sigma variation

3.087E-9

Unit

Eccentricity (e)

Value

0.732278

1-sigma variation

2.275E-8

Unit

Inclination (i)

Value

3.7716

1-sigma variation

4.257E-6

Unit

Long. of Ascending Node (Ω)

Value

299.9498

1-sigma variation

3.169E-5

Unit

Arg. of Perihelion (ω)

Value

315.1894

1-sigma variation

3.185E-5

Unit

Mean Anomaly (M)

Value

87.70433

1-sigma variation

1.606E-6

Unit

Perihelion distance

Value

0.441364

1-sigma variation

Unit

Aphelion distance

Value

2.855812

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.513940

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.605658

1-sigma variation

Unit

MOID

Value

0.029630

1-sigma variation

Unit

Orbit Period

Value

773.1552

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.52970E-18	-1.27732E-17	1.42207E-15	1.22057E-15	-4.80384E-15	-4.52033E-15
e	-1.27732E-17	5.17345E-16	7.07372E-15	-5.91502E-14	1.37825E-13	1.78229E-14
i	1.42207E-15	7.07372E-15	1.81231E-11	1.12900E-10	-1.11917E-10	-2.81965E-13
Ω	1.22057E-15	-5.91502E-14	1.12900E-10	1.00454E-9	-1.00306E-9	-4.52259E-12
ω	-4.80384E-15	1.37825E-13	-1.11917E-10	-1.00306E-9	1.01462E-9	8.04648E-12
M	-4.52033E-15	1.78229E-14	-2.81965E-13	-4.52259E-12	8.04648E-12	2.57898E-12

Date of computation: 2025-09-10 00:30 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

18.308

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

600 - 1300*

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 Aegis	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

20116

Unit

Source

[1]

Unobserved

Value

201

Unit

Source

[1]

Normalized RMS of residuals

Value

0.684661

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1970-01-31.27941

Unit

Source

[2]

Last Observation

Value

2025-02-27.138965

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

583 (3)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2023-02-11

Unit

Source

[3]

Last Observation

Value

2023-02-12

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

3 (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 199145 2005YY128 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
MERCURY	1955-06-18 13:41	< 1 min	0.0262161	0.0262159	0.0000001
MERCURY	1966-01-20 15:02	< 1 min	0.0264601	0.0264600	0.0000000
EARTH	1970-02-24 16:03	< 1 min	0.1911132	0.1911118	0.0000005
MERCURY	1976-08-21 17:42	< 1 min	0.0248973	0.0248970	0.0000001
EARTH	1987-02-11 18:14	< 1 min	0.0994310	0.0994294	0.0000005
MERCURY	1987-03-30 09:23	< 1 min	0.0247860	0.0247858	0.0000001
EARTH	1993-09-23 03:11	< 1 min	0.0906522	0.0906512	0.0000003
MERCURY	1997-10-29 18:54	< 1 min	0.0218787	0.0218784	0.0000001
MERCURY	2008-05-30 16:06	< 1 min	0.0215033	0.0215030	0.0000001
MERCURY	2018-12-31 20:01	< 1 s	0.0461791	0.0461789	0.0000001
EARTH	2023-02-16 00:45	< 1 s	0.0307335	0.0307335	0.0000000
EARTH	2029-09-26 15:36	< 1 s	0.0595136	0.0595135	0.0000001
EARTH	2059-02-18 10:51	< 1 min	0.0488634	0.0488617	0.0000006
MERCURY	2059-04-12 15:18	< 1 min	0.0438758	0.0438740	0.0000006
EARTH	2065-10-01 17:56	< 1 min	0.1127971	0.1127950	0.0000007
EARTH	2076-02-09 05:11	< 1 min	0.1774904	0.1774887	0.0000006
EARTH	2082-09-22 11:14	< 1 min	0.1196399	0.1196385	0.0000005
MERCURY	2103-10-13 22:49	< 1 min	0.0371878	0.0371871	0.0000003
EARTH	2112-02-23 21:02	< 1 min	0.1204084	0.1204069	0.0000005
MERCURY	2114-05-21 11:56	< 1 min	0.0238020	0.0238010	0.0000003
EARTH	2118-10-06 11:05	< 1 min	0.1721750	0.1721735	0.0000005
MERCURY	2124-12-29 18:31	< 1 min	0.0210144	0.0210138	0.0000002

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
303.08068416	44.09872297	0.02960461	MINIMUM
57.41920106	262.45532969	0.05919140	MINIMUM
0.68256930	153.75496103	0.57404956	SADDLE
0.77172244	334.01787174	1.42632974	SADDLE
180.07453344	333.14646949	1.87244473	SADDLE
180.16963460	153.18795210	3.86991597	MAXIMUM

Download:

MOID Plots

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