Asteroids

2017DH16 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.825

Aphelion (Q)

1.774

Eccentricity (e)

0.365

Inclination (i)

1.6

deg

Orbit period (P)

541.1

Earth MOID

0.00701

U parameter

8.5

Next Earth close approach

Date

2025-10-03

Nominal distance (from Earth center)

0.02649

3962640

Maximum Brightness

22.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.2

mag

Diameter

9 - 21*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-02-21

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.299519

1-sigma variation

0.002369

Unit

Eccentricity (e)

Value

0.364892

1-sigma variation

0.000901

Unit

Inclination (i)

Value

1.6074

1-sigma variation

0.0265

Unit

Long. of Ascending Node (Ω)

Value

134.5612

1-sigma variation

1.6032

Unit

Arg. of Perihelion (ω)

Value

307.0340

1-sigma variation

1.4416

Unit

Mean Anomaly (M)

Value

356.99515

1-sigma variation

1.55717

Unit

Perihelion distance

Value

0.825335

1-sigma variation

Unit

Aphelion distance

Value

1.773704

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.063011

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.429190

1-sigma variation

Unit

MOID

Value

0.007006

1-sigma variation

Unit

Orbit Period

Value

541.0938

1-sigma variation

Unit

U parameter

Value

8.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.61119E-6	2.13422E-6	-6.28377E-5	-3.79762E-3	3.41483E-3	-3.68861E-3
e	2.13422E-6	8.11760E-7	-2.39002E-5	-1.44443E-3	1.29883E-3	-1.40297E-3
i	-6.28377E-5	-2.39002E-5	7.03703E-4	4.25283E-2	-3.82416E-2	4.13074E-2
Ω	-3.79762E-3	-1.44443E-3	4.25283E-2	2.57021E0	-2.31114E0	2.49643E0
ω	3.41483E-3	1.29883E-3	-3.82416E-2	-2.31114E0	2.07818E0	-2.24479E0
M	-3.68861E-3	-1.40297E-3	4.13074E-2	2.49643E0	-2.24479E0	2.42477E0

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

27.24

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

9 - 21*

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

3119

Unit

Source

[1]

Normalized RMS of residuals

Value

0.297502

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-02-21.3025

Unit

Source

[2]

Last Observation

Value

2017-03-03.305399

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

40 (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 2017DH16 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
MARS	1954-09-10 05:31	352.3	0.0471615	0.0423227	0.0314166
EARTH	1955-02-27 03:28	> 1 d	0.1332521	0.0070024	0.0859229
EARTH	1958-01-19 09:55	> 1 mo	0.1212033	0.0183254	0.0489905
EARTH	1960-11-08 03:44	> 1 mo	0.1352235	0.0375995	0.0353792
EARTH	1963-09-25 16:04	> 1 d	0.1159963	0.0239360	0.0639077
EARTH	1986-03-02 04:44	> 1 d	0.1855923	0.0079354	0.0892072
EARTH	1989-01-26 23:35	> 1 mo	0.1049413	0.0128070	0.0731965
EARTH	1991-11-08 16:16	> 1 mo	0.1344247	0.0297917	0.0477266
EARTH	1994-09-23 21:49	> 1 d	0.1427271	0.0238727	0.1002728
EARTH	2017-02-17 23:15	< 1 min	0.0085505	0.0085187	0.0000106
EARTH	2020-01-05 18:51	> 1 d	0.1440911	0.1292727	0.0049586
EARTH	2022-11-16 13:58	> 1 w	0.1434713	0.1124645	0.0104311
EARTH	2025-10-03 20:45	> 1 d	0.0264886	0.0235531	0.0191438
EARTH	2057-02-23 20:34	> 1 mo	0.0725806	0.0074010	0.5407699
EARTH	2060-01-21 05:55	> 1 mo	0.1198119	0.0188749	0.2286988
EARTH	2062-11-27 11:32	> 1 mo	0.1543370	0.0582158	0.0469099
EARTH	2065-10-06 17:58	> 1 d	0.0268169	0.0237348	0.0265867
EARTH	2068-09-22 06:23	> 1 d	0.1894339	0.0792407	0.0371738
EARTH	2100-02-28 21:50	> 1 mo	0.1366685	0.0085107	0.8836620
EARTH	2103-02-11 03:53	> 1 mo	0.0622425	0.0087774	0.7661219
EARTH	2105-12-16 15:37	> 1 mo	0.1597472	0.1447128	0.0221045
EARTH	2108-10-20 02:04	> 1 mo	0.0860838	0.0240236	0.2195982
EARTH	2111-09-28 07:21	> 1 d	0.1202463	0.0247892	0.0624525

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
48.78432323	45.80536088	0.00648262	MINIMUM
309.18090577	270.44082831	0.02360459	MINIMUM
358.57436337	337.58860377	0.16025387	SADDLE
179.43029500	158.67054181	0.76148252	SADDLE
358.87256769	158.03074390	1.84093257	SADDLE
179.54035555	338.75212150	2.76060488	MAXIMUM

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MOID Plots

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