Asteroids

2017HG4 help

Last update: 2024-04-26 23:50 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.706

Aphelion (Q)

1.025

Eccentricity (e)

0.184

Inclination (i)

3.0

deg

Orbit period (P)

294.1

Earth MOID

0.00132

U parameter

1.2

Next Earth close approach

Date

2025-04-12

Nominal distance (from Earth center)

0.17864

26723999

Maximum Brightness

27.3

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

27.7

mag

Diameter

8 - 17*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-04-26

Observatory

Pan-STARRS 1, Haleakala

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.865540

1-sigma variation

1.516E-8

Unit

Eccentricity (e)

Value

0.184094

1-sigma variation

7.302E-8

Unit

Inclination (i)

Value

2.9968

1-sigma variation

5.233E-6

Unit

Long. of Ascending Node (Ω)

Value

210.4564

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

205.7613

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

18.20119

1-sigma variation

0.00003

Unit

Perihelion distance

Value

0.706200

1-sigma variation

Unit

Aphelion distance

Value

1.024880

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.002363

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.276722

1-sigma variation

Unit

MOID

Value

0.001320

1-sigma variation

Unit

Orbit Period

Value

294.1231

1-sigma variation

Unit

U parameter

Value

1.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.29804E-16	-9.58120E-16	-3.70179E-14	5.04897E-13	-5.40312E-13	-2.32690E-13
e	-9.58120E-16	5.33153E-15	1.15490E-13	-3.16779E-12	3.50191E-12	6.15383E-13
i	-3.70179E-14	1.15490E-13	2.73839E-11	4.47898E-11	-1.19829E-11	1.11170E-11
Ω	5.04897E-13	-3.16779E-12	4.47898E-11	3.23172E-9	-2.82552E-9	-9.95962E-10
ω	-5.40312E-13	3.50191E-12	-1.19829E-11	-2.82552E-9	2.78903E-9	5.68797E-10
M	-2.32690E-13	6.15383E-13	1.11170E-11	-9.95962E-10	5.68797E-10	8.35938E-10

Date of computation: 2024-04-23 10:08 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

27.694

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

8 - 17*

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 ODIM	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

1480

Unit

Source

[1]

Unobserved

Value

1078

Unit

Source

[1]

Normalized RMS of residuals

Value

0.58054

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-04-26.26272

Unit

Source

[2]

Last Observation

Value

2021-05-15.29929

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

38 (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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	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 2017HG4 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1956-04-08 15:27	1.5	0.1621995	0.1618691	0.0001101
VENUS	1962-04-17 05:40	12.5	0.0380961	0.0380564	0.0000133
EARTH	1967-05-14 17:15	12.5	0.0272957	0.0272544	0.0000138
VENUS	1970-11-13 07:58	28.6	0.0383212	0.0382875	0.0000113
EARTH	1974-04-08 11:37	2.0	0.0958111	0.0955706	0.0000802
EARTH	1974-07-28 20:49	233.4	0.1997167	0.1995675	0.0000498
EARTH	1985-05-29 19:30	< 1 min	0.1960162	0.1957712	0.0000817
VENUS	1991-03-19 11:36	19.4	0.0424666	0.0423910	0.0000253
EARTH	1992-05-19 21:03	17.3	0.0388219	0.0387305	0.0000305
EARTH	1999-04-13 15:38	3.4	0.0291878	0.0291504	0.0000124
EARTH	2010-05-31 02:15	< 1 min	0.1774315	0.1774063	0.0000084
EARTH	2017-04-22 06:23	< 1 min	0.0015601	0.0015600	0.0000000
EARTH	2021-04-16 04:54	< 1 min	0.0223640	0.0223637	0.0000001
VENUS	2025-01-04 13:33	< 1 min	0.0159874	0.0159872	0.0000001
EARTH	2025-04-12 15:12	< 1 min	0.1786389	0.1786373	0.0000005
EARTH	2042-06-13 22:05	< 1 min	0.1687920	0.1687760	0.0000053
EARTH	2046-06-01 23:57	2.1	0.0373203	0.0373155	0.0000016
EARTH	2050-04-17 23:40	1.2	0.0122889	0.0122786	0.0000034
EARTH	2063-02-08 14:47	345.3	0.1881888	0.1879170	0.0000906
EARTH	2063-06-15 22:18	7.9	0.0843015	0.0839012	0.0001336
VENUS	2063-09-25 05:50	66.2	0.0311216	0.0306929	0.0001434
EARTH	2067-04-13 18:14	3.7	0.0748409	0.0748284	0.0000042
EARTH	2067-08-18 02:45	72.9	0.1859368	0.1858891	0.0000159
EARTH	2080-06-15 09:11	2.5	0.1435022	0.1421898	0.0004377
EARTH	2084-04-16 13:48	48.5	0.0236539	0.0228858	0.0002561
VENUS	2096-12-27 13:05	> 1 d	0.0084041	0.0060174	0.0027589
EARTH	2097-04-10 10:48	863.1	0.0597831	0.0597607	0.0000105
EARTH	2097-08-23 15:22	1324.5	0.1885446	0.1867403	0.0006018
VENUS	2099-06-09 08:17	382.5	0.0076254	0.0056241	0.0006925
EARTH	2106-02-04 18:40	> 1 mo	0.1923462	0.1449943	0.0157841
EARTH	2106-06-16 03:26	923.8	0.1045132	0.0434031	0.0301676
EARTH	2110-04-15 01:42	292.8	0.1576703	0.0370559	0.0402161
EARTH	2119-06-16 20:56	195.9	0.1540496	0.0475248	0.0418270
VENUS	2119-10-03 03:34	> 1 w	0.0086146	0.0052355	0.0311251
VENUS	2122-03-04 08:15	> 1 w	0.0406972	0.0156632	0.1455482

Download as: