Asteroids

2018GY help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.455

Aphelion (Q)

1.078

Eccentricity (e)

0.406

Inclination (i)

8.8

deg

Orbit period (P)

245.2

Earth MOID

0.00903

U parameter

1.4

A₂

-307.8

10^-15au/days²

Next Earth close approach

Date

2057-05-08

Nominal distance (from Earth center)

0.16358

24471183

Maximum Brightness

24.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.9

mag

Diameter

28 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-04-08

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.766743

1-sigma variation

1.403E-8

Unit

Eccentricity (e)

Value

0.406199

1-sigma variation

1.955E-7

Unit

Inclination (i)

Value

8.7501

1-sigma variation

1.631E-5

Unit

Long. of Ascending Node (Ω)

Value

176.9047

1-sigma variation

7.458E-6

Unit

Arg. of Perihelion (ω)

Value

204.9808

1-sigma variation

1.653E-5

Unit

Mean Anomaly (M)

Value

231.42008

1-sigma variation

0.00008

Unit

Perihelion distance

Value

0.455293

1-sigma variation

Unit

Aphelion distance

Value

1.078193

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.018495

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.537004

1-sigma variation

Unit

MOID

Value

0.009029

1-sigma variation

Unit

Orbit Period

Value

245.2298

1-sigma variation

Unit

U parameter

Value

1.4

1-sigma variation

Unit

A₂

Value

-307.80332

1-sigma variation

41.87140

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.96811E-16	9.60213E-16	8.22574E-14	-4.47473E-15	5.98548E-14	-8.79029E-13	5.81535E-7
e	9.60213E-16	3.82292E-14	2.68679E-12	2.36330E-14	2.72257E-12	-1.33406E-11	2.44799E-6
i	8.22574E-14	2.68679E-12	2.66167E-10	3.55957E-11	1.47891E-10	-9.72634E-10	2.23000E-4
Ω	-4.47473E-15	2.36330E-14	3.55957E-11	5.56171E-11	-4.22286E-11	-2.21794E-12	-2.73063E-8
ω	5.98548E-14	2.72257E-12	1.47891E-10	-4.22286E-11	2.73136E-10	-9.61279E-10	1.61621E-4
M	-8.79029E-13	-1.33406E-11	-9.72634E-10	-2.21794E-12	-9.61279E-10	6.45082E-9	-2.50362E-3
A₂	5.81535E-7	2.44799E-6	2.23000E-4	-2.73063E-8	1.61621E-4	-2.50362E-3	1.75322E3

Date of computation: 2026-03-17 23:26 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

24.865

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

28 - 60*

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

1471

Unit

Source

[1]

Unobserved

Value

1511

Unit

Source

[1]

Normalized RMS of residuals

Value

0.80283

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-03-18.577685

Unit

Source

[2]

Last Observation

Value

2022-03-28.231315

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

41 (6)

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

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 2018GY 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	1963-05-08 03:03	1.2	0.1476333	0.1475655	0.0000226
EARTH	1965-05-03 12:28	3.5	0.1165847	0.1165662	0.0000062
EARTH	1967-04-23 11:04	4.2	0.1092208	0.1092166	0.0000014
EARTH	1969-04-09 01:59	1.8	0.0999427	0.0999373	0.0000018
EARTH	1971-03-27 03:43	1.2	0.0724727	0.0724657	0.0000024
EARTH	1973-03-16 22:13	2.2	0.0257920	0.0257570	0.0000117
EARTH	1975-03-13 12:03	1.1	0.0314476	0.0313882	0.0000198
EARTH	1977-03-12 04:57	< 1 min	0.1030075	0.1029417	0.0000219
EARTH	1979-03-14 02:38	< 1 min	0.1834480	0.1833847	0.0000211
EARTH	2008-05-07 19:35	< 1 min	0.1932221	0.1932177	0.0000015
EARTH	2010-05-07 19:27	< 1 min	0.1413165	0.1413145	0.0000007
EARTH	2012-05-02 11:04	< 1 min	0.1153947	0.1153941	0.0000002
EARTH	2014-04-21 20:10	< 1 min	0.1094709	0.1094703	0.0000002
EARTH	2016-04-07 15:20	< 1 min	0.0988969	0.0988964	0.0000002
EARTH	2018-03-26 06:02	< 1 min	0.0705956	0.0705954	0.0000001
EARTH	2020-03-16 13:10	< 1 s	0.0240581	0.0240580	0.0000000
EARTH	2022-03-13 08:32	< 1 s	0.0304807	0.0304805	0.0000001
EARTH	2024-03-12 01:10	< 1 s	0.0996584	0.0996577	0.0000002
EARTH	2026-03-13 19:40	< 1 min	0.1769476	0.1769461	0.0000005
EARTH	2057-05-08 07:19	< 1 min	0.1635798	0.1635466	0.0000110
EARTH	2059-05-06 12:13	1.4	0.1251813	0.1251632	0.0000060
EARTH	2061-04-28 07:37	4.0	0.1122880	0.1122845	0.0000012
EARTH	2063-04-16 10:14	6.4	0.1073591	0.1073513	0.0000026
EARTH	2065-04-02 15:21	7.1	0.0906325	0.0906060	0.0000089
EARTH	2067-03-22 12:51	5.7	0.0554281	0.0553764	0.0000172
EARTH	2069-03-15 03:42	2.8	0.0096481	0.0096088	0.0000132
EARTH	2071-03-13 10:03	2.4	0.0381642	0.0379913	0.0000576
EARTH	2073-03-12 07:50	< 1 min	0.0955102	0.0952658	0.0000815
EARTH	2075-03-13 16:44	2.8	0.1590803	0.1587823	0.0000993
EARTH	2112-05-08 23:07	2.5	0.1661209	0.1655283	0.0001979
EARTH	2114-05-08 00:12	18.9	0.1322578	0.1318915	0.0001228
EARTH	2116-05-02 16:42	47.4	0.1161912	0.1160715	0.0000406
EARTH	2118-04-24 14:10	79.0	0.1116552	0.1116044	0.0000174
EARTH	2120-04-13 14:20	97.0	0.1055497	0.1053787	0.0000572
EARTH	2122-04-03 14:59	97.4	0.0903668	0.0899830	0.0001281
EARTH	2124-03-24 18:13	79.1	0.0637017	0.0630811	0.0002070
EARTH	2126-03-18 16:16	47.6	0.0279213	0.0271655	0.0002523

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
138.36978840	71.91085779	0.00837291	MINIMUM
356.97266919	277.85196293	0.54421037	SADDLE
355.77901982	96.04882089	1.45787401	SADDLE
177.44732353	277.75889099	2.07510140	MAXIMUM

Download:

MOID Plots

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