Asteroids

2017RH16 help

Last update: 2026-09-06 13:00 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.487

Aphelion (Q)

1.262

Eccentricity (e)

0.443

Inclination (i)

0.6

deg

Orbit period (P)

298.8

Earth MOID

5.924E-7

U parameter

0.5

Next Earth close approach

Date

2027-12-04

Nominal distance (from Earth center)

0.1156

17294194

Maximum Brightness

25.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.1

mag

Diameter

16 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-09-13

Observatory

Pan-STARRS 1, Haleakala

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.874660

1-sigma variation

1.438E-9

Unit

Eccentricity (e)

Value

0.442916

1-sigma variation

6.235E-8

Unit

Inclination (i)

Value

0.6175

1-sigma variation

4.143E-6

Unit

Long. of Ascending Node (Ω)

Value

338.3195

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

226.6080

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

347.11758

1-sigma variation

0.00008

Unit

Perihelion distance

Value

0.487259

1-sigma variation

Unit

Aphelion distance

Value

1.262061

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.000029

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.450902

1-sigma variation

Unit

MOID

Value

0.000001

1-sigma variation

Unit

Orbit Period

Value

298.7839

1-sigma variation

Unit

U parameter

Value

0.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.06800E-18	-7.26229E-17	1.29034E-15	7.79509E-14	-9.16408E-15	-1.05980E-13
e	-7.26229E-17	3.88797E-15	-5.38046E-14	-3.25140E-12	3.71470E-13	4.26581E-12
i	1.29034E-15	-5.38046E-14	1.71661E-11	3.21180E-10	-2.70840E-10	-7.62365E-11
Ω	7.79509E-14	-3.25140E-12	3.21180E-10	2.02484E-8	-1.71452E-8	-4.70915E-9
ω	-9.16408E-15	3.71470E-13	-2.70840E-10	-1.71452E-8	1.68285E-8	4.76199E-10
M	-1.05980E-13	4.26581E-12	-7.62365E-11	-4.70915E-9	4.76199E-10	6.45513E-9

Date of computation: 2026-09-06 13:00 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

26.098

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

16 - 40*

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

3290

Unit

Source

[1]

Unobserved

Value

0.3

Unit

Source

[1]

Normalized RMS of residuals

Value

0.907934

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-09-03.395133

Unit

Source

[2]

Last Observation

Value

2026-09-06.287804

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

42 (5)

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2017RH16 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1954-12-03 09:55	3.5	0.1211904	0.1211280	0.0000208
EARTH	1963-12-03 19:42	2.5	0.1203847	0.1203397	0.0000150
EARTH	1972-12-01 09:42	1.1	0.1344137	0.1343990	0.0000049
EARTH	1981-11-26 04:57	1.5	0.1686765	0.1686616	0.0000050
EARTH	1985-09-17 18:49	2.7	0.1951527	0.1951342	0.0000062
VENUS	1989-06-06 18:33	1.3	0.0481470	0.0481012	0.0000153
VENUS	1991-11-22 11:03	1.2	0.0462294	0.0461877	0.0000139
EARTH	1994-09-03 17:49	< 1 min	0.1030637	0.1030413	0.0000075
EARTH	1995-12-04 00:06	< 1 min	0.1705911	0.1705723	0.0000063
EARTH	2003-09-02 13:48	< 1 min	0.0693781	0.0693523	0.0000086
EARTH	2004-12-07 15:59	< 1 min	0.0249711	0.0249424	0.0000096
EARTH	2017-08-31 14:38	< 1 min	0.0055208	0.0055204	0.0000001
EARTH	2018-12-05 12:58	< 1 min	0.0867881	0.0867878	0.0000001
EARTH	2026-08-31 21:04	< 1 min	0.0222369	0.0222361	0.0000003
EARTH	2027-12-04 17:36	< 1 min	0.1156045	0.1156042	0.0000001
VENUS	2033-09-19 17:42	< 1 min	0.0229448	0.0229443	0.0000002
EARTH	2035-09-03 09:20	< 1 min	0.0982109	0.0982091	0.0000006
EARTH	2036-12-01 06:02	< 1 min	0.1964462	0.1964432	0.0000010
EARTH	2044-09-13 12:34	< 1 min	0.1777959	0.1777932	0.0000009
EARTH	2049-11-25 08:32	< 1 min	0.1675371	0.1675334	0.0000012
VENUS	2054-05-03 00:49	< 1 min	0.0311014	0.0310986	0.0000009
EARTH	2057-09-05 15:21	< 1 s	0.1880926	0.1880882	0.0000015
EARTH	2058-12-04 18:08	< 1 min	0.0964817	0.0964773	0.0000015
EARTH	2066-09-02 23:03	< 1 min	0.0972144	0.0972115	0.0000010
EARTH	2067-12-07 08:02	< 1 min	0.0138608	0.0138588	0.0000007
MERCURY	2072-03-25 05:06	< 1 min	0.0482359	0.0482358	0.0000000
EARTH	2075-09-02 18:34	< 1 min	0.0903843	0.0903803	0.0000013
EARTH	2076-12-06 16:07	< 1 min	0.0196796	0.0196759	0.0000012
MERCURY	2080-06-02 07:26	< 1 min	0.0494013	0.0494011	0.0000001
EARTH	2084-09-04 14:47	< 1 min	0.1793612	0.1793580	0.0000011
EARTH	2085-12-03 08:00	< 1 min	0.1138207	0.1138174	0.0000011
EARTH	2098-09-06 11:16	< 1 min	0.1377153	0.1377053	0.0000034
EARTH	2107-09-01 17:11	< 1 min	0.0111058	0.0110918	0.0000047
EARTH	2108-12-05 11:10	< 1 min	0.0918350	0.0918225	0.0000042
EARTH	2116-08-31 22:42	< 1 min	0.0249591	0.0247972	0.0000540
EARTH	2117-12-04 21:26	1.4	0.1134289	0.1133004	0.0000428
VENUS	2118-01-01 12:00	3.0	0.0292216	0.0291067	0.0000383
VENUS	2120-06-15 14:39	< 1 min	0.0445741	0.0445404	0.0000112
EARTH	2125-09-03 04:29	4.6	0.0914250	0.0912686	0.0000521
EARTH	2126-12-02 12:28	3.8	0.1919776	0.1917587	0.0000730

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
110.42157316	234.59965970	0.00000059	MINIMUM
253.36577517	330.66893506	0.01061723	MINIMUM
181.51758135	282.20284638	0.26545141	SADDLE
3.86328744	104.83689113	0.51648029	SADDLE
3.82280702	284.78747919	1.48363765	SADDLE
181.50006810	102.19718829	2.26537049	MAXIMUM

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MOID Plots

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