Asteroids

2016YM4 help

Last update: 2025-07-29 02:36 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.752

Aphelion (Q)

4.789

Eccentricity (e)

0.729

Inclination (i)

3.2

deg

Orbit period (P)

1684.0

Earth MOID

0.01066

U parameter

5.4

Next Earth close approach

Date

2030-07-08

Nominal distance (from Earth center)

0.13653

20424944

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

22.3

mag

Diameter

90 - 200*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2016-12-24

Observatory

Mt. Lemmon Survey

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

2.770128

1-sigma variation

0.000115

Unit

Eccentricity (e)

Value

0.728670

1-sigma variation

0.000012

Unit

Inclination (i)

Value

3.2288

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

130.2931

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

236.5644

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

306.17140

1-sigma variation

0.04125

Unit

Perihelion distance

Value

0.751620

1-sigma variation

Unit

Aphelion distance

Value

4.788637

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.182690

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.086754

1-sigma variation

Unit

MOID

Value

0.010662

1-sigma variation

Unit

Orbit Period

Value

1684.0240

1-sigma variation

Unit

U parameter

Value

5.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.31814E-8	1.36310E-9	6.94806E-9	-4.14822E-8	4.87600E-8	-4.73535E-6
e	1.36310E-9	1.40983E-10	7.18055E-10	-4.28502E-9	5.03132E-9	-4.89688E-7
i	6.94806E-9	7.18055E-10	3.91535E-9	-2.44277E-8	2.83630E-8	-2.49606E-6
Ω	-4.14822E-8	-4.28502E-9	-2.44277E-8	1.59293E-7	-1.83317E-7	1.49023E-5
ω	4.87600E-8	5.03132E-9	2.83630E-8	-1.83317E-7	2.13147E-7	-1.75169E-5
M	-4.73535E-6	-4.89688E-7	-2.49606E-6	1.49023E-5	-1.75169E-5	1.70116E-3

Date of computation: 2025-07-29 02:36 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

22.343

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

90 - 200*

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

[-]

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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

Unit

Source

[1]

Unobserved

Value

3110

Unit

Source

[1]

Normalized RMS of residuals

Value

0.473734

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2016-12-05.187753

Unit

Source

[2]

Last Observation

Value

2017-02-02.287014

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

62 (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

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

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 2016YM4 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	1957-11-04 15:13	> 1 mo	0.1976417	0.0698489	0.8812656
VENUS	1984-12-25 15:59	> 1 mo	0.0411665	0.0058063	0.2459433
VENUS	1998-07-04 00:00	> 1 d	0.0076177	0.0067951	0.0022635
EARTH	2016-12-05 02:57	< 1 min	0.0517815	0.0517789	0.0000008
EARTH	2030-07-08 09:58	468.1	0.1365323	0.1196523	0.0056300
EARTH	2039-07-30 20:55	1174.9	0.1328750	0.1148827	0.0060036
VENUS	2039-08-29 18:47	> 1 d	0.0163057	0.0158824	0.0009415
EARTH	2057-11-23 07:36	> 1 w	0.1621412	0.0405666	0.0718957
EARTH	2112-07-08 14:47	> 1 d	0.1784860	0.0010375	0.0785594
EARTH	2121-08-10 23:49	> 1 mo	0.1779450	0.0070397	0.1428507

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
330.43940341	197.59559460	0.01066181	MINIMUM
27.97723279	329.46449746	0.04766543	MINIMUM
359.15064716	263.67592828	0.25312158	SADDLE
358.88675316	83.00300801	1.74923837	SADDLE
179.83838812	84.32170269	3.79176567	SADDLE
179.80336531	264.30719156	5.78914664	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2016YM4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2121-07-20.806	95939.806	-1.122	0.000	0.46 ± 0.006	3.29E4	1.38E-5	1.14E2	-3.67	0


Based on 62 optical observations (of which 0 are rejected as outliers) from 2016/12/05.188 to 2017/02/02.287.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.16 and 1.16 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: