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{{Infobox planet
{{Infobox planet
| minorplanet = yes
| minorplanet = yes
| name = 5642 Bobbywilliams
| background = #FFFFC0
| background = #FFCCD1
| apsis =
| image =
| name = Bobbywilliams
| symbol =
| caption =
| discovery_ref = &thinsp;<ref name="jpldata" />
| image =
| discovered = 27 July 1990
| caption =
| discoverer = [[Henry E. Holt|H. E. Holt]]
| discovery_ref =
| discovery_site = [[Palomar Observatory|Palomar Obs.]]
| discoverer = [[H. E. Holt]]
| mp_name = 5642 Bobbywilliams
| discovery_site = [[Palomar Observatory|Palomar]]
| discovered = 27 July 1990
| alt_names = {{mp|1990 OK|1}}
| named_after = [[Bobby G. Williams]]<br />{{small|([[JPL]] staff member)}}<ref name="springer" />
| mp_name = 5642
| mp_category = [[List of Mars-crossing minor planets|Mars-crosser]]&thinsp;<ref name="MPC-Bobbywilliams" /><ref name="lcdb" />
| alt_names = 1990 OK1
| orbit_ref = &thinsp;<ref name="jpldata" />
| mp_category =
| epoch = 31 July 2016 ([[Julian day|JD]] 2457600.5)
| orbit_ref = <ref name="jpldata">{{Cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=5642;cad=1 |title=5642 Bobbywilliams (1990 OK1) |work=[[JPL Small-Body Database]] |publisher=[[NASA]]/[[Jet Propulsion Laboratory]] |access-date=13 April 2016}}</ref>
| uncertainty = 0
| epoch = 13 January 2016 ([[Julian day|JD]] 2457400.5)
| observation_arc = {{nowrap|40.87 yr (14,928 days)}}
| aphelion = {{Convert|3.0866569|AU|Gm|abbr=on|lk=on}}
| aphelion = 3.0867 [[Astronomical unit|AU]]
| perihelion = {{Convert|1.5424661|AU|Gm|abbr=on}}
| perihelion = 1.5431 AU
| semimajor = {{Convert|2.314562|AU|Gm|abbr=on}}
| semimajor = 2.3149 AU
| eccentricity = 0.3335817
| eccentricity = 0.3334
| period = 3.52 [[Julian year (astronomy)|yr]] (1286.2 [[Julian year (astronomy)|d]])
| period = 3.52 [[Julian year (astronomy)|yr]] (1,286 days)
| avg_speed =
| mean_anomaly = 123.29[[Degree (angle)|°]]
| inclination = 24.98386°
| mean_motion = {{Deg2DMS|0.2798|sup=ms}} / day
| asc_node = 310.18041°
| inclination = 24.981°
| mean_anomaly = 67.33056[[Degree (angle)|°]]
| arg_peri = 38.93570°
| asc_node = 310.18°
| arg_peri = 38.959°
| satellites =
| moid = 0.5806 AU
| dimensions =
| dimensions = 4.71 km {{small|(calculated)}}<ref name="lcdb" />
| mass =
| rotation = {{val|4.8341|0.0003}} [[Hour|h]]<ref name="Oey-2012d" />
| density =
| albedo = 0.20 {{small|(assumed)}}<ref name="lcdb" />
| surface_grav =
| spectral_type = [[S-type asteroid|S]]&thinsp;<ref name="lcdb" />
| escape_velocity =
| abs_magnitude = 14.0<ref name="jpldata" /><ref name="lcdb" /><br />{{val|14.24|0.23}}<ref name="Veres-2015" />
| sidereal_day =
| axial_tilt =
| pole_ecliptic_lat =
| pole_ecliptic_lon =
| albedo =
| temperatures=
| temp_name1 =
| mean_temp_1 =
| max_temp_1 =
| temp_name2 =
| max_temp_2 =
| spectral_type =
| abs_magnitude = 14.0
| mean_motion = {{Deg2DMS|0.2798988|sup=ms}} / day
| rotation = {{Convert|4.8341|h|d|abbr=on|lk=on}}
| observation_arc = 14928 days (40.87 yr)
| uncertainty = 0
| moid = {{Convert|0.578729|AU|Gm|abbr=on}}
| jupiter_moid = {{Convert|2.44488|AU|Gm|abbr=on}}
| tisserand = 3.388
}}
}}
'''5642 Bobbywilliams''' (1990 OK1) is a [[Mars-crossing asteroid]] discovered on July 27, 1990 by [[H. E. Holt]] at [[Palomar Observatory|Palomar]].


'''5642 Bobbywilliams''', provisional designation {{mp|1990 OK|1}}, is an eccentric stony [[asteroid]] and [[Mars-crosser]] from the inner regions of the [[asteroid belt]], approximately 4.7 kilometers in diameter. It was discovered by American astronomer [[Henry E. Holt]] at the U.S. [[Palomar Observatory]], California, on 27 July 1990.<ref name="MPC-Bobbywilliams" />
==References==
{{Reflist}}


The [[S-type asteroid|S-type]] asteroid orbits the Sun at a distance of 1.5–3.1&nbsp;[[Astronomical unit|AU]] once every 3 years and 6 months (1,286 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.33 and an [[orbital inclination|inclination]] of 25[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> The first [[precovery]] was taken at the Australian [[Siding Spring Observatory]] in 1975, extending the asteroid's [[observation arc]] by 15 years prior to its discovery.<ref name="MPC-Bobbywilliams" />
== External links ==
* {{JPL Small Body}}


A rotational [[light-curve]] for this asteroid was obtained from photometric observations by astronomer Julian Oey at both the Australian [[Kingsgrove Observatory|Kingsgrove]] and [[Leura Observatory|Leura]] observatories in July 2011. It gave a well-defined [[rotation period]] of {{val|4.8341|0.0003}} hours with a brightness variation of 0.05 in [[Magnitude (astronomy)|magnitude]] ({{small|[[LCDB quality code|U=3]]}}).<ref name="Oey-2012d" /> The ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 4.71 kilometers.<ref name="lcdb" />
{{Minor planets navigator|5641 McCleese|5643 Roques}}

{{Small Solar System bodies}}
The minor planet was named for [[Jet Propulsion Laboratory]] engineer Bobby G. Williams (b.&thinsp;1951), specialized in [[celestial mechanics]] and the navigation of [[space probe]]s. He has been a leading navigation manager when [[NEAR Shoemaker]] had its rendezvous with the asteroids [[253 Mathilde]] and [[433 Eros]],<ref name="springer" /> Naming citation was published on 28 July 1999 ({{small|[[Minor Planet Circulars|M.P.C.]] 35483}}).<ref name="MPC-Circulars-Archive" />

== References ==
{{reflist
|refs=

<ref name="jpldata">{{cite web
|type = 2016-02-21 last obs.
|title = JPL Small-Body Database Browser: 5642 Bobbywilliams (1990 OK1)
|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005642
|publisher = Jet Propulsion Laboratory
|accessdate = July 2016}}</ref>

<ref name="springer">{{cite book
|title = Dictionary of Minor Planet Names – (5642) Bobbywilliams
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|pages = 478–479
|date = 2007
|url = http://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_5346
|isbn = 978-3-540-00238-3
|accessdate = July 2016}}</ref>

<ref name="MPC-Bobbywilliams">{{cite web
|title = 5642 Bobbywilliams (1990 OK1)
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=5642
|accessdate = July 2016}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = July 2016}}</ref>

<ref name="lcdb">{{cite web
|title = LCDB Data for (5642) Bobbywilliams
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=5642%7CBobbywilliams
|accessdate = July 2016}}</ref>

<ref name="Oey-2012d">{{cite journal
|author = Oey, Julian
|date = July 2012
|title = Lightcurve Analysis of Asteroids Observed in 2011 from Leura and Kingsgrove Observatories
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38..221O
|journal = The Minor Planet Bulletin
|volume = 39
|issue = 3
|pages = 145–147
|issn = 1052-8091
|bibcode = 2012MPBu...39..145O
|access-date= July 2016}}</ref>

<ref name="Veres-2015">{{cite journal
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|access-date= July 2016}}</ref>

}} <!-- end of reflist -->

== External links ==
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
* [http://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center
* {{JPL small body|title=5642 Bobbywilliams (1990 OK1)|id=2005642}}


{{DEFAULTSORT:Bobbywilliams}}
{{DEFAULTSORT:Bobbywilliams}}
[[Category:Mars-crossing asteroids|005642]]
[[Category:Mars-crossing asteroids|005642]]
[[Category:Numbered minor planets|005642]]
[[Category:Numbered minor planets|005642]]
[[Category:Asteroids named for people]]
[[Category:Discoveries by Henry E. Holt]]
[[Category:Discoveries by Henry E. Holt]]
[[Category:Asteroids named for people]]
[[Category:Astronomical objects discovered in 1990|19900727]]
[[Category:Astronomical objects discovered in 1990|19900727]]


{{mars-crosser-asteroid-stub}}

Revision as of 19:42, 10 July 2016

5642 Bobbywilliams
Discovery [1]
Discovered byH. E. Holt
Discovery sitePalomar Obs.
Discovery date27 July 1990
Designations
5642 Bobbywilliams
Named after
Bobby G. Williams
(JPL staff member)[2]
1990 OK1
Mars-crosser [3][4]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc40.87 yr (14,928 days)
Aphelion3.0867 AU
Perihelion1.5431 AU
2.3149 AU
Eccentricity0.3334
3.52 yr (1,286 days)
123.29°
0° 16m 47.28s / day
Inclination24.981°
310.18°
38.959°
Earth MOID0.5806 AU
Physical characteristics
Dimensions4.71 km (calculated)[4]
4.8341±0.0003 h[5]
0.20 (assumed)[4]
S [4]
14.0[1][4]
14.24±0.23[6]

5642 Bobbywilliams, provisional designation 1990 OK1, is an eccentric stony asteroid and Mars-crosser from the inner regions of the asteroid belt, approximately 4.7 kilometers in diameter. It was discovered by American astronomer Henry E. Holt at the U.S. Palomar Observatory, California, on 27 July 1990.[3]

The S-type asteroid orbits the Sun at a distance of 1.5–3.1 AU once every 3 years and 6 months (1,286 days). Its orbit has an eccentricity of 0.33 and an inclination of 25° with respect to the ecliptic.[1] The first precovery was taken at the Australian Siding Spring Observatory in 1975, extending the asteroid's observation arc by 15 years prior to its discovery.[3]

A rotational light-curve for this asteroid was obtained from photometric observations by astronomer Julian Oey at both the Australian Kingsgrove and Leura observatories in July 2011. It gave a well-defined rotation period of 4.8341±0.0003 hours with a brightness variation of 0.05 in magnitude (U=3).[5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 4.71 kilometers.[4]

The minor planet was named for Jet Propulsion Laboratory engineer Bobby G. Williams (b. 1951), specialized in celestial mechanics and the navigation of space probes. He has been a leading navigation manager when NEAR Shoemaker had its rendezvous with the asteroids 253 Mathilde and 433 Eros,[2] Naming citation was published on 28 July 1999 (M.P.C. 35483).[7]

References

  1. ^ a b c d "JPL Small-Body Database Browser: 5642 Bobbywilliams (1990 OK1)" (2016-02-21 last obs.). Jet Propulsion Laboratory. Retrieved July 2016. {{cite web}}: Check date values in: |accessdate= (help)
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (5642) Bobbywilliams. Springer Berlin Heidelberg. pp. 478–479. ISBN 978-3-540-00238-3. Retrieved July 2016. {{cite book}}: Check date values in: |accessdate= (help)
  3. ^ a b c "5642 Bobbywilliams (1990 OK1)". Minor Planet Center. Retrieved July 2016. {{cite web}}: Check date values in: |accessdate= (help)
  4. ^ a b c d e f "LCDB Data for (5642) Bobbywilliams". Asteroid Lightcurve Database (LCDB). Retrieved July 2016. {{cite web}}: Check date values in: |accessdate= (help)
  5. ^ a b Oey, Julian (July 2012). "Lightcurve Analysis of Asteroids Observed in 2011 from Leura and Kingsgrove Observatories". The Minor Planet Bulletin. 39 (3): 145–147. Bibcode:2012MPBu...39..145O. ISSN 1052-8091. Retrieved July 2016. {{cite journal}}: Check date values in: |access-date= (help)
  6. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved July 2016. {{cite journal}}: Check date values in: |access-date= (help)
  7. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved July 2016. {{cite web}}: Check date values in: |accessdate= (help)

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=5642_Bobbywilliams&oldid=729223461"