Asteroids

164207 2004GU9 help

Last update: 2024-04-24 23:53 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.865

Aphelion (Q)

1.137

Eccentricity (e)

0.136

Inclination (i)

13.7

deg

Orbit period (P)

365.9

Earth MOID

0.00141

U parameter

0.1

A₂

-61.6

10^-15au/days²

Next Earth close approach

Date

2026-10-12

Nominal distance (from Earth center)

0.19834

29671938

Maximum Brightness

21.1

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

21.1

mag

Diameter

163

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2004-04-13

Observatory

Lincoln Laboratory ETS, New Mexico

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

1.001215

1-sigma variation

4.117E-9

Unit

Eccentricity (e)

Value

0.135963

1-sigma variation

1.436E-7

Unit

Inclination (i)

Value

13.6521

1-sigma variation

8.585E-6

Unit

Long. of Ascending Node (Ω)

Value

38.4245

1-sigma variation

9.703E-6

Unit

Arg. of Perihelion (ω)

Value

279.5279

1-sigma variation

1.711E-5

Unit

Mean Anomaly (M)

Value

226.82937

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.865087

1-sigma variation

Unit

Aphelion distance

Value

1.137344

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.030777

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.001674

1-sigma variation

Unit

MOID

Value

0.001408

1-sigma variation

Unit

Orbit Period

Value

365.9229

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

A₂

Value

-61.58230

1-sigma variation

7.91255

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.69461E-17	4.05568E-16	2.20348E-14	3.98955E-16	-6.90234E-15	-2.63851E-14	2.95598E-8
e	4.05568E-16	2.06224E-14	1.15716E-12	3.07276E-14	-2.51953E-13	-6.77850E-13	4.95093E-7
i	2.20348E-14	1.15716E-12	7.37016E-11	-3.25063E-12	-1.15199E-11	-3.23448E-11	2.70149E-5
Ω	3.98955E-16	3.07276E-14	-3.25063E-12	9.41574E-11	-5.00860E-11	-6.16161E-11	5.80009E-6
ω	-6.90234E-15	-2.51953E-13	-1.15199E-11	-5.00860E-11	2.92625E-10	-2.95927E-10	8.44982E-6
M	-2.63851E-14	-6.77850E-13	-3.23448E-11	-6.16161E-11	-2.95927E-10	5.31479E-10	-7.45783E-5
A₂	2.95598E-8	4.95093E-7	2.70149E-5	5.80009E-6	8.44982E-6	-7.45783E-5	6.26084E1

Date of computation: 2024-04-23 11:53 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

21.127

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.219

Unit

Source

[2]

Diameter

Value

163

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]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs) 2.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8357

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.655734

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-05-11.30459

Unit

Source

[2]

Last Observation

Value

2024-03-28.166792

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

340 (3)

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 164207 2004GU9 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	1957-10-07 18:08	1.6	0.1993371	0.1993233	0.0000046
EARTH	1958-10-11 01:25	1.7	0.1907743	0.1907570	0.0000058
EARTH	1959-10-13 14:36	2.0	0.1827703	0.1827494	0.0000070
EARTH	1960-10-14 23:21	2.2	0.1753398	0.1753148	0.0000083
EARTH	1961-10-17 00:49	2.4	0.1683074	0.1682781	0.0000097
EARTH	1962-10-18 14:45	2.7	0.1622394	0.1622060	0.0000111
EARTH	1963-10-20 02:52	2.9	0.1572708	0.1572330	0.0000126
EARTH	1964-10-20 02:06	3.2	0.1532722	0.1532303	0.0000140
EARTH	1965-10-21 01:00	3.4	0.1503291	0.1502831	0.0000153
EARTH	1966-10-21 16:16	3.6	0.1483786	0.1483288	0.0000166
EARTH	1967-10-21 22:24	3.9	0.1478116	0.1477584	0.0000177
EARTH	1968-10-21 07:07	4.1	0.1479785	0.1479218	0.0000189
EARTH	1969-10-21 05:60	4.3	0.1490819	0.1490223	0.0000199
EARTH	1970-10-20 23:52	4.6	0.1515846	0.1515224	0.0000207
EARTH	1971-10-20 14:23	4.7	0.1555160	0.1554518	0.0000214
EARTH	1972-10-18 17:17	5.0	0.1604262	0.1603605	0.0000219
EARTH	1973-10-17 15:31	5.3	0.1662430	0.1661764	0.0000222
EARTH	1974-10-16 12:00	5.5	0.1727904	0.1727234	0.0000224
EARTH	1975-10-14 17:05	5.8	0.1802565	0.1801897	0.0000223
EARTH	1976-10-11 14:50	6.2	0.1882804	0.1882141	0.0000221
EARTH	1977-10-09 09:07	6.5	0.1967325	0.1966671	0.0000218
EARTH	1994-04-27 13:32	1.7	0.1936990	0.1936349	0.0000214
EARTH	1995-04-28 13:54	1.5	0.1854862	0.1854232	0.0000210
EARTH	1996-04-28 20:09	1.2	0.1780070	0.1779455	0.0000205
EARTH	1997-04-29 13:51	1.0	0.1717699	0.1717103	0.0000198
EARTH	1998-04-30 01:08	< 1 min	0.1668154	0.1667583	0.0000191
EARTH	1999-04-30 19:04	< 1 min	0.1627909	0.1627364	0.0000182
EARTH	2000-04-30 02:02	< 1 min	0.1594166	0.1593652	0.0000171
EARTH	2001-04-30 12:34	< 1 min	0.1575633	0.1575152	0.0000160
EARTH	2002-04-30 22:16	< 1 min	0.1570696	0.1570252	0.0000148
EARTH	2003-04-30 23:19	< 1 min	0.1579588	0.1579184	0.0000135
EARTH	2004-04-30 08:20	< 1 min	0.1598940	0.1598576	0.0000121
EARTH	2005-04-30 10:42	< 1 min	0.1633773	0.1633451	0.0000107
EARTH	2006-04-30 07:56	< 1 min	0.1683623	0.1683342	0.0000094
EARTH	2007-04-30 12:55	< 1 min	0.1743863	0.1743623	0.0000080
EARTH	2008-04-29 05:49	< 1 min	0.1808697	0.1808497	0.0000067
EARTH	2009-04-28 18:54	< 1 min	0.1885057	0.1884894	0.0000055
EARTH	2010-04-28 12:27	< 1 min	0.1969781	0.1969652	0.0000043
EARTH	2026-10-12 08:24	1.1	0.1983447	0.1983284	0.0000054
EARTH	2027-10-14 19:18	1.2	0.1895642	0.1895441	0.0000067
EARTH	2028-10-16 07:52	1.4	0.1814033	0.1813789	0.0000081
EARTH	2029-10-18 01:24	1.5	0.1738969	0.1738682	0.0000096
EARTH	2030-10-19 13:54	1.7	0.1674990	0.1674659	0.0000110
EARTH	2031-10-20 20:54	1.8	0.1622499	0.1622123	0.0000125
EARTH	2032-10-20 16:35	2.0	0.1577219	0.1576800	0.0000140
EARTH	2033-10-21 16:22	2.1	0.1541567	0.1541104	0.0000154
EARTH	2034-10-22 04:47	2.3	0.1518715	0.1518212	0.0000168
EARTH	2035-10-22 12:09	2.5	0.1514498	0.1513959	0.0000180
EARTH	2036-10-21 20:01	2.6	0.1522069	0.1521496	0.0000191
EARTH	2037-10-21 15:38	2.7	0.1542297	0.1541698	0.0000200
EARTH	2038-10-21 11:10	2.9	0.1575732	0.1575109	0.0000208
EARTH	2039-10-21 03:10	3.0	0.1621572	0.1620930	0.0000214
EARTH	2040-10-19 08:11	3.1	0.1674616	0.1673961	0.0000218
EARTH	2041-10-18 14:60	3.2	0.1737636	0.1736970	0.0000222
EARTH	2042-10-17 14:45	3.4	0.1811547	0.1810876	0.0000224
EARTH	2043-10-15 18:15	3.6	0.1898652	0.1897983	0.0000223
EARTH	2044-10-12 14:54	3.9	0.1992252	0.1991590	0.0000221
EARTH	2061-05-05 22:11	< 1 min	0.1977999	0.1977377	0.0000207
EARTH	2062-05-05 08:39	< 1 min	0.1893595	0.1892984	0.0000203
EARTH	2063-05-05 09:58	< 1 min	0.1816715	0.1816119	0.0000199
EARTH	2064-05-04 09:30	< 1 min	0.1743627	0.1743046	0.0000194
EARTH	2065-05-04 03:13	< 1 min	0.1684302	0.1683738	0.0000188
EARTH	2066-05-04 09:12	< 1 min	0.1637939	0.1637396	0.0000181
EARTH	2067-05-04 11:14	< 1 min	0.1603026	0.1602506	0.0000173
EARTH	2068-05-03 11:24	< 1 min	0.1579769	0.1579276	0.0000164
EARTH	2069-05-03 22:12	< 1 min	0.1572100	0.1571637	0.0000154
EARTH	2070-05-04 02:29	< 1 min	0.1578373	0.1577942	0.0000144
EARTH	2071-05-04 12:03	< 1 min	0.1597470	0.1597073	0.0000132
EARTH	2072-05-04 03:21	< 1 min	0.1624295	0.1623932	0.0000121
EARTH	2073-05-04 11:03	< 1 min	0.1666188	0.1665859	0.0000110
EARTH	2074-05-05 07:18	< 1 min	0.1720636	0.1720342	0.0000098
EARTH	2075-05-06 01:44	< 1 min	0.1784031	0.1783771	0.0000087
EARTH	2076-05-05 19:36	< 1 min	0.1856896	0.1856668	0.0000076
EARTH	2077-05-07 08:23	< 1 min	0.1941945	0.1941747	0.0000066
EARTH	2094-10-20 11:10	< 1 min	0.1962884	0.1962638	0.0000082
EARTH	2095-10-21 21:55	< 1 min	0.1876844	0.1876561	0.0000094
EARTH	2096-10-22 01:27	< 1 min	0.1794118	0.1793797	0.0000107
EARTH	2097-10-22 16:49	< 1 min	0.1720558	0.1720197	0.0000120
EARTH	2098-10-23 17:36	< 1 min	0.1658758	0.1658359	0.0000133
EARTH	2099-10-24 03:60	< 1 min	0.1613092	0.1612654	0.0000146
EARTH	2100-10-24 16:57	< 1 min	0.1580098	0.1579625	0.0000158
EARTH	2101-10-25 06:59	< 1 min	0.1559854	0.1559347	0.0000169
EARTH	2102-10-25 09:17	< 1 min	0.1554894	0.1554357	0.0000179
EARTH	2103-10-25 18:22	< 1 min	0.1564928	0.1564364	0.0000188
EARTH	2104-10-24 22:48	< 1 min	0.1581872	0.1581285	0.0000195
EARTH	2105-10-24 20:60	1.0	0.1611001	0.1610397	0.0000201
EARTH	2106-10-25 04:02	< 1 min	0.1654598	0.1653979	0.0000206
EARTH	2107-10-24 23:51	< 1 min	0.1715264	0.1714636	0.0000209
EARTH	2108-10-23 18:29	< 1 min	0.1786760	0.1786126	0.0000211
EARTH	2109-10-23 21:42	< 1 min	0.1867373	0.1866735	0.0000212
EARTH	2110-10-23 07:39	< 1 min	0.1957399	0.1956763	0.0000212

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