Asteroids

308635 2005YU55 help

Last update: 2025-06-27 14:33 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.659

Aphelion (Q)

1.655

Eccentricity (e)

0.431

Inclination (i)

0.3

deg

Orbit period (P)

454.5

Earth MOID

0.00047

U parameter

0.0

Next Earth close approach

Date

2036-10-31

Nominal distance (from Earth center)

0.12148

18173280

Maximum Brightness

20.1

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

21.7

mag

Diameter

306

Taxonomic type

Rotation period (T)

19.31

Discovery Information

Discovery Date

2005-12-28

Observatory

Steward Observatory, Kitt Peak-Spacewatch

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.156851

1-sigma variation

2.307E-9

Unit

Eccentricity (e)

Value

0.430504

1-sigma variation

7.866E-9

Unit

Inclination (i)

Value

0.3399

1-sigma variation

1.108E-6

Unit

Long. of Ascending Node (Ω)

Value

35.9302

1-sigma variation

3.682E-5

Unit

Arg. of Perihelion (ω)

Value

273.5530

1-sigma variation

3.675E-5

Unit

Mean Anomaly (M)

Value

347.78020

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.658822

1-sigma variation

Unit

Aphelion distance

Value

1.654879

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.077447

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.035558

1-sigma variation

Unit

MOID

Value

0.000468

1-sigma variation

Unit

Orbit Period

Value

454.4796

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.32277E-18	3.24318E-19	-1.13013E-16	3.00088E-15	-2.23670E-15	-3.31021E-14
e	3.24318E-19	6.18693E-17	-3.99499E-16	-4.28716E-14	3.62018E-14	-4.82890E-15
i	-1.13013E-16	-3.99499E-16	1.22865E-12	3.87574E-11	-3.87598E-11	7.24392E-13
Ω	3.00088E-15	-4.28716E-14	3.87574E-11	1.35551E-9	-1.35254E-9	-1.66725E-11
ω	-2.23670E-15	3.62018E-14	-3.87598E-11	-1.35254E-9	1.35057E-9	1.21169E-11
M	-3.31021E-14	-4.82890E-15	7.24392E-13	-1.66725E-11	1.21169E-11	2.06076E-10

Date of computation: 2025-06-27 14:33 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

19.31

Unit

Source

[4]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.2

Unit

mag

Source

[4]

Rotation Direction

Value

RETRO

Unit

Source

[1]

Spinvector L

Value

Unit

Source

[1]

Spinvector B

Value

-60

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

Taxonomy (all)

Value

Unit

Source

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

21.27

21.675

Unit

mag

Source

[5]

[6]

Slope Parameter (G)

Value

0.15**

-0.147

Unit

mag

Source

[6]

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.065

Unit

Source

[8]

Diameter

Value

306

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.34

0.67

Unit

V-R

B-V

Source

[9]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[10]

[11]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Mueller, T.G. et al. (2013) Astron. Astrophys. 558, A97. (Physical Properties of Asteroid (308635) 2005 YU55 derived from multi-instrument infrared observations during a very close Earth-Approach) 2.) Merline, W.J. et al. (2011) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/09200/09242.html"> 9242. (2005 YU_55) (NIR/AO-observations with Keck II)
[2]	EARN	1.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2571"> ATel#2571 (Palomar Spectroscopy of 2001 FM129, 2004 FG11, and 2005 YU55)
[3]	EARN	1.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2571"> ATel#2571 (Palomar Spectroscopy of 2001 FM129, 2004 FG11, and 2005 YU55) 2.) Somers, J.M. et al. (2010) DPS 42, 1316. (abstract) (Optical Characterization Of Planetary Radar Targets, Low-deltaV, And Potentially Hazardous Asteroids: Results From 2009-2010)
[4]	EARN	1.) Warner, B.D. et al. (2012) ACM2012, 6013. (CCD PHOTOMETRIC OBSERVATIONS OF 2005 YU55 DURING THE 2011 NOVEMBER FLYBY) 2.) Warner, B.D. et al. (2001) href="http://www.minorplanet.info/ObsGuides/YU55/">2005 YU55 Observing Campaign Webpage 3.) Gyorgyey Ries, J. (2012) AAS 219, 432.13 (Broadband CCD Photometry of 2005 YU55 in Four Colors at McDonald Observatory) (November 2011 flyby)
[5]	EARN	1.) Warner, B.D. et al. (2012) ACM2012, 6013. (CCD PHOTOMETRIC OBSERVATIONS OF 2005 YU55 DURING THE 2011 NOVEMBER FLYBY) 2.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=3763"> ATel#3763 (Broadband photometry of 2005 YU55: Solar phase behavior and absolute magnitude) 3.) Bodewits, D. et al. (2011) CBET HREF="http://www.cbat.eps.harvard.edu/iau/cbet/002900/CBET002937.txt"> 2937. (2005 YU_55)) (UV observations)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Mueller, T.G. et al. (2013) Astron. Astrophys. 558, A97. (Physical properties of asteroid 308635 (2005 YU55) derived from multi-instrument infrared observations during a very close Earth approach) 2.) Merline, W.J. et al. (2011) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/09200/09242.html"> 9242. (2005 YU_55) (NIR/AO-observations with Keck II) 3.) Mueller, T. et al. (2011) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/09200/09241.html"> 9241. (2005 YU_55) (IR-observation with Herschel) 4.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=3763"> ATel#3763 (Broadband photometry of 2005 YU55: Solar phase behavior and absolute magnitude) 5.) Busch, M.W. et al. (2012) ACM2012, 6179. (Shape and Spin of Near-Earth Asteroid 308635 (2005 YU55) From Radar Images and Speckle Tracking) 6.) Mueller, T.G. et al. (2013) Astron. Astrophys. 558, A97. (Physical Properties of Asteroid (308635) 2005 YU55 derived from multi-instrument infrared observations during a very close Earth-Approach) 7.) Mueller, T.G. et al. (2011) Astron. Astrophys 525, A145. (Thermo-physical properties of 162173 (1999 JU3), a potential flyby and rendezvous target for interplanetary missions) 8.) Moskovitz, N.A. et al. (2012) ACM2012, 6382. (THE NEAR-EARTH ENCOUNTER OF 2005 YU55: TIME-RESOLVED VISIBLE AND NEARINFRARED SPECTROSCOPY)
[8]	EARN	1.) Mueller, T.G. et al. (2013) Astron. Astrophys. 558, A97. (Physical properties of asteroid 308635 (2005 YU55) derived from multi-instrument infrared observations during a very close Earth approach) 2.) Mueller, T. et al. (2011) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/09200/09241.html"> 9241. (2005 YU_55) (IR-observation with Herschel) 3.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=3763"> ATel#3763 (Broadband photometry of 2005 YU55: Solar phase behavior and absolute magnitude) 4.) Mueller, T.G. et al. (2013) Astron. Astrophys. 558, A97. (Physical Properties of Asteroid (308635) 2005 YU55 derived from multi-instrument infrared observations during a very close Earth-Approach) 5.) Mueller, T.G. et al. (2011) Astron. Astrophys 525, A145. (Thermo-physical properties of 162173 (1999 JU3), a potential flyby and rendezvous target for interplanetary missions) 6.) Moskovitz, N.A. et al. (2012) ACM2012, 6382. (THE NEAR-EARTH ENCOUNTER OF 2005 YU55: TIME-RESOLVED VISIBLE AND NEARINFRARED SPECTROSCOPY)
[9]	EARN	1.) Vereshchagina, A.I. (2014) Solar System Res. 48, 382-390. (Astrometry and photometry of asteroid (308635) 2005 YU55)
[10]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Taylor, P.A. et al. (2012) AAS 219, 432.11 (Radar Observations of 2005 YU55's Flyby of Earth) (April 2010 flyby) 3.) Busch, M.W. et al. (2012) ACM2012, 6179. (Shape and Spin of Near-Earth Asteroid 308635 (2005 YU55) From Radar Images and Speckle Tracking)
[11]	EARN	1.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2571"> ATel#2571 (Palomar Spectroscopy of 2001 FM129, 2004 FG11, and 2005 YU55) 2.) Lim, L.F. et al. (2012) LPSC 43, 2202. (The Near-Earth Encounter of 2005 YU55: Thermal Infrared Observations from Gemini North) 3.) Moskovitz, N.A. et al.(2012) LPSC 43, 2202. (THE NEAR-EARTH ENCOUNTER OF ASTEROID 2005 YU55: VISIBLE AND NEAR-INFRARED SPECTROSCOPY)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

5857

Unit

Source

[1]

Unobserved

Value

1285

Unit

Source

[1]

Normalized RMS of residuals

Value

0.32322

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-12-24.29832

Unit

Source

[2]

Last Observation

Value

2022-01-06.256608

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

4003 (31)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2011-11-10

Unit

Source

[3]

Last Observation

Value

2011-11-10

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (0)

Unit

Source

[1]

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
[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 308635 2005YU55 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
EARTH	1950-11-03 11:16	< 1 min	0.1014879	0.1014709	0.0000057
EARTH	1960-04-13 02:17	< 1 min	0.1092731	0.1092483	0.0000083
EARTH	1961-11-01 17:48	< 1 min	0.1296705	0.1296446	0.0000086
EARTH	1971-04-10 06:19	< 1 min	0.1899077	0.1898845	0.0000077
VENUS	1984-12-05 22:28	< 1 min	0.0485965	0.0485885	0.0000027
VENUS	1986-02-21 14:41	< 1 min	0.0439552	0.0439509	0.0000014
VENUS	1990-12-01 10:23	< 1 min	0.0288021	0.0288005	0.0000005
VENUS	1992-02-17 23:40	< 1 min	0.0126295	0.0126283	0.0000004
MARS	2002-07-14 14:28	< 1 min	0.0397093	0.0397092	0.0000000
EARTH	2010-04-19 12:19	< 1 s	0.0151942	0.0151942	0.0000000
EARTH	2011-11-08 23:28	< 1 s	0.0021720	0.0021720	0.0000000
EARTH	2016-11-01 12:26	< 1 s	0.1236508	0.1236505	0.0000001
VENUS	2029-01-19 20:43	< 1 min	0.0023191	0.0023183	0.0000002
EARTH	2036-10-31 10:56	1.2	0.1214809	0.1214356	0.0000151
EARTH	2040-04-14 02:17	1.2	0.1518139	0.1517539	0.0000200
EARTH	2041-11-12 06:34	1.3	0.1017326	0.1016661	0.0000222
EARTH	2045-04-25 03:21	1.8	0.0698707	0.0697990	0.0000239
VENUS	2055-07-01 13:07	2.2	0.0291799	0.0291292	0.0000169
EARTH	2070-10-23 01:04	20.3	0.1935967	0.1933045	0.0000974
EARTH	2075-11-08 07:25	9.2	0.0013550	0.0012611	0.0000501
EARTH	2080-10-25 03:02	> 1 w	0.1883401	0.0003136	0.0745061
VENUS	2094-04-05 01:44	> 1 w	0.0052542	0.0033604	0.1789258
VENUS	2095-06-29 02:53	> 1 mo	0.0035709	0.0033451	0.1623599
VENUS	2096-09-26 13:59	> 1 mo	0.0356546	0.0048654	9.9438093
VENUS	2101-10-16 16:28	> 1 mo	0.0469141	0.0351940	22.2241036
VENUS	2103-01-16 05:21	> 1 mo	0.0362276	0.0348292	12.8418682
EARTH	2105-04-16 02:49	> 1 mo	0.1017138	0.0038405	66.7729457
EARTH	2106-11-09 14:30	> 1 mo	0.0084944	0.0004183	74.0668824
EARTH	2111-11-05 03:53	> 1 mo	0.0855909	0.0005294	1412.1605286
MARS	2113-06-04 19:14	> 1 mo	0.0264521	0.0257157	135.2644121
EARTH	2116-10-24 21:13	> 1 mo	0.1923293	0.0021714	2600.8989723
MARS	2117-04-10 11:44	> 1 mo	0.0316125	0.0301518	79.1079043
MARS	2121-02-09 10:33	> 1 mo	0.0435936	0.0296551	1194.2227727

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
287.74890063	108.04428650	0.00046762	MINIMUM
70.51224351	304.51960450	0.00107089	MINIMUM
358.68477550	205.78793058	0.35577625	SADDLE
179.47528267	26.66406502	0.66953322	SADDLE
358.72140447	25.82870054	1.64415089	SADDLE
179.46051671	206.64748778	2.66937545	MAXIMUM

Download:

MOID Plots

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