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{{Infobox planet
{{Multiple issues|
| minorplanet = yes
{{refimprove|date=May 2015}}
| name = 1691 Oort
{{notability|Astro|date=May 2015}}
| background = #FFFFC0
| image = [[File:1691Oort (Lightcurve Inversion).png|250px]]
| caption = {{longitem|[[Light-curve]]-based 3D-model of 1691 Oort|style=padding: 5px 0; line-height: 1.3em;}}
| discovery_ref = &thinsp;<ref name="jpldata" />
| discovered = 9 September 1956
| discoverer = [[Karl Reinmuth|K. Reinmuth]]<br />[[Ingrid van Houten-Groeneveld|I. Groeneveld]]
| discovery_site = [[Heidelberg-Königstuhl State Observatory|Heidelberg Obs.]]
| mp_name = 1691 Oort
| alt_names = 1956 RB{{·}}1945 TD<br />1947 DA{{·}}1950 PZ<br />1950 RU{{·}}1951 XW<br />1955 MW{{·}}1956 SD<br />1964 DA{{·}}A917 TD
| named_after = [[Jan Oort]]<br />{{small|(astronomer)}}<ref name="springer" />
| mp_category = [[main-belt]]{{·}}[[Themis family|Themis]]&thinsp;<ref name="lcdb" />
| orbit_ref = &thinsp;<ref name="jpldata" />
| epoch = 27 June 2015 ([[Julian day|JD]] 2457200.5)
| uncertainty = 0
| observation_arc = {{nowrap|69.66 yr (25,443 days)}}
| aphelion = 3.7160 [[Astronomical unit|AU]]
| perihelion = 2.6216 AU
| semimajor = 3.1688 AU
| eccentricity = 0.1726
| period = 5.64 [[Julian year (astronomy)|yr]] (2,060 days)
| mean_anomaly = 99.783[[degree (angle)|°]]
| inclination = 1.0824°
| asc_node = 174.47°
| arg_peri = 233.13°
| dimensions = {{val|37.37|0.74}} km<ref name="AKARI" /><br />{{val|33.163|0.534}} km<ref name="WISE" /><br />27.13 km {{small|(caculated)}}<ref name="lcdb" />
| rotation = 10.2705 [[hour|h]]<ref name="geneva-obs" /><br />{{val|10.2684|0.0005}} h<ref name="Hanus-2013c" />
| albedo = {{val|0.053|0.002}}<ref name="AKARI" /><br />{{val|0.0672|0.0150}}<ref name="WISE" /><br />0.10 {{small|(assumed)}}<ref name="lcdb" />
| spectral_type = [[Asteroid color indices|B–V]] = 0.682<br />[[Asteroid color indices|U–B]] = 0.316<br />[[Tholen classification|Tholen]] = CU&thinsp;<ref name="jpldata" /><br />[[C-type asteroid|C]]&thinsp;<ref name="lcdb" />
| abs_magnitude = 10.95
}}
}}
{{Infobox planet
| width = 25em
| bgcolour = #FFFFC0
| image = [[File:1691Oort (Lightcurve Inversion).png|250px]]
|caption=A three-dimensional model of 1691 Oort based on its light curve.
| apsis =
| name = Oort
| symbol =
| discovery = yes
| discovery_ref =
| discoverer = [[Ingrid van Houten-Groeneveld]] and [[Karl Wilhelm Reinmuth]]
| discovery_site = [[Landessternwarte Heidelberg-Königstuhl|Heidelberg]]
| discovered = September 9, 1956
| designations = yes
| mp_name = 1691
| alt_names = 1956 RB
| named_after = [[Jan Oort]]
| mp_category =
| orbit_ref =
| epoch = May 14, 2008
| aphelion = 3.7041652
| perihelion = 2.6331262
| semimajor =
| eccentricity = 0.1690058
| period = 2060.1978362
| avg_speed =
| inclination = 1.07707
| asc_node = 174.65986
| mean_anomaly = 5.89751
| arg_peri = 232.63108
| satellites =
| physical_characteristics = yes
| dimensions =
| mass =
| density =
| surface_grav =
| escape_velocity =
| 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 = 10.95
}}
'''1691 Oort''' (1956 RB) is a [[Asteroid belt|main-belt]] [[asteroid]] discovered on September 9, 1956 by [[Ingrid van Houten-Groeneveld]] and [[Karl Wilhelm Reinmuth]] at [[Landessternwarte Heidelberg-Königstuhl|Heidelberg]]. It was named after the Dutch astronomer [[Jan Oort]].


'''1691 Oort''', provisional designation 1956 RB, is a dark [[asteroid]] from the outer region of the [[asteroid belt]], roughly 30 kilometers in diameter. It was discovered by German astronomer [[Karl Reinmuth]] and Dutch female astronomer [[Ingrid van Houten-Groeneveld]] at [[Heidelberg-Königstuhl State Observatory|Heidelberg Observatory]] in south-west Germany on 9 September 1956.<ref name="MPC-Oort" />
== External links ==
*{{JPL small body}}


The carbonaceous [[C-type asteroid|C-type]] asteroid, classified as CU-type in the [[Tholen classification|Tholen]] taxonomy, orbits the Sun at a distance of 2.6–3.7&nbsp;[[Astronomical unit|AU]] once every 5 years and 8 months (2,060 days). Its orbit shows an [[orbital eccentricity|eccentricity]] of 0.17 and is nearly coplanar to the plane of the [[ecliptic]], with an [[orbital inclination]] of only 1 degree.<ref name="jpldata" /> It has a well-defined [[rotation period]] of 10.27 hours<ref name="geneva-obs" /><ref name="Hanus-2013c" /> and an [[geometric albedo|albedo]] of 0.05–0.07 determined by the [[Akari (satellite)|Akari]] and [[Wide-field Infrared Survey Explorer|WISE]]/[[NEOWISE]] surveys.<ref name="AKARI" /><ref name="WISE" />

It was named in honor of Dutch astronomer [[Jan Oort]] (1900–1992), director of the [[Leiden Observatory]] (1945–1970), president of the [[International Astronomical Union]] (1958–1961), and a well-known authority on stellar statistics and galactic structure.<ref name="springer" /> He overturned the idea that the Sun was at the center of the Milky Way. The [[Oort cloud]], the outermost gravitational bound region of the Solar System, was also named after him.

== References ==
{{reflist
|refs=

<ref name="geneva-obs">{{cite web
|title=Asteroids and comets rotation curves – (1691) Oort
|last=Behrend |first=Raoul
|publisher=Geneva Observatory
|url=http://obswww.unige.ch/~behrend/page4cou.html#001691
|accessdate=November 2015}}</ref>

<ref name="lcdb">{{cite web
|title=LCDB Data for (1691) Oort
|publisher=Asteroid Lightcurve Database (LCDB)
|url=http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1691%7COort
|accessdate=November 2015}}</ref>

<ref name="jpldata">{{cite web
|type=2015-06-13 last obs.
|title=JPL Small-Body Database Browser: 1691 Oort (1956 RB)
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001691
|publisher=Jet Propulsion Laboratory
|accessdate=November 2015}}</ref>

<ref name="springer">{{cite book
|url=http://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1692
|title=Dictionary of Minor Planet Names – (1691) Oort
|last=Schmadel |first=Lutz D.
|publisher=Springer Berlin Heidelberg
|page=134
|date=2003
|isbn=978-3-540-29925-7
|accessdate=November 2015}}</ref>

<ref name="MPC-Oort">{{cite web
|title=1691 Oort (1956 RB)
|work=Minor Planet Center
|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=1691
|accessdate=November 2015}}</ref>

<ref name="AKARI">{{cite journal
|authors = Usui, Fumihiko; Kuroda, Daisuke; M&#252;ller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; Ishihara, Daisuke; Kataza, Hirokazu; Takita, Satoshi; Oyabu, Shinki; Ueno, Munetaka; Matsuhara, Hideo; Onaka, Takashi
|date = October 2011
|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011PASJ...63.1117U
|journal = Publications of the Astronomical Society of Japan
|publisher =
|volume = 63
|issue = 5
|pages = 1117–1138
|bibcode = 2011PASJ...63.1117U
|doi = 10.1093/pasj/63.5.1117
|access-date= November 2015}}</ref>

<ref name="WISE">{{cite journal
|authors = Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; McMillan, R. S.; Spahr, T.; Cutri, R. M.; Wright, E.; Watkins, J.; Mo, W.; Maleszewski, C.
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 25
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|access-date= November 2015}}</ref>

<ref name="Hanus-2013c">{{cite journal
|authors = Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; Higgins, D.; Koff, R. A.; Oey, J.; Pilcher, F.; Stephens, R.; Strabla, L. P.; Ulisse, Q.; Girelli, R.
|date = November 2013
|title = An anisotropic distribution of spin vectors in asteroid families
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...559A.134H
|journal = Astronomy &#38; Astrophysics
|publisher =
|volume = 559
|page = 19
|bibcode = 2013A&A...559A.134H
|doi = 10.1051/0004-6361/201321993
|access-date= November 2015}}</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.se/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/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* {{JPL small body|title=1691 Oort (1956 RB)|id=2001691}}
{{Minor planets navigator|1690 Mayrhofer|1692 Subbotina}}
{{Minor planets navigator|1690 Mayrhofer|1692 Subbotina}}
{{Small Solar System bodies}}
{{Small Solar System bodies}}

{{DEFAULTSORT:001691}}
{{DEFAULTSORT:Oort}}
[[Category:Main-belt asteroids]]
[[Category:Main-belt asteroids|001691]]
[[Category:Discoveries by Karl Wilhelm Reinmuth]]
[[Category:Numbered asteroids]]
[[Category:Discoveries by Ingrid van Houten-Groeneveld]]
[[Category:Discoveries by Karl Wilhelm Reinmuth|001691]]
[[Category:Discoveries by Ingrid van Houten-Groeneveld|Oort]]
[[Category:Asteroids named for people|Oort]]
[[Category:Asteroids named for people|Oort]]
[[Category:Astronomical objects discovered in 1956|19560909]]
[[Category:Astronomical objects discovered in 1956|19560909]]
[[Category:Cu-type asteroids (Tholen)]]
[[Category:Cu-type asteroids (Tholen)|001691]]


{{beltasteroid-stub}}
{{Beltasteroid-stub}}

Revision as of 17:02, 10 November 2015

1691 Oort
Light-curve-based 3D-model of 1691 Oort
Discovery [1]
Discovered byK. Reinmuth
I. Groeneveld
Discovery siteHeidelberg Obs.
Discovery date9 September 1956
Designations
1691 Oort
Named after
Jan Oort
(astronomer)[2]
1956 RB · 1945 TD
1947 DA · 1950 PZ
1950 RU · 1951 XW
1955 MW · 1956 SD
1964 DA · A917 TD
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc69.66 yr (25,443 days)
Aphelion3.7160 AU
Perihelion2.6216 AU
3.1688 AU
Eccentricity0.1726
5.64 yr (2,060 days)
99.783°
Inclination1.0824°
174.47°
233.13°
Physical characteristics
Dimensions37.37±0.74 km[4]
33.163±0.534 km[5]
27.13 km (caculated)[3]
10.2705 h[6]
10.2684±0.0005 h[7]
0.053±0.002[4]
0.0672±0.0150[5]
0.10 (assumed)[3]
B–V = 0.682
U–B = 0.316
Tholen = CU [1]
C [3]
10.95

1691 Oort, provisional designation 1956 RB, is a dark asteroid from the outer region of the asteroid belt, roughly 30 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth and Dutch female astronomer Ingrid van Houten-Groeneveld at Heidelberg Observatory in south-west Germany on 9 September 1956.[8]

The carbonaceous C-type asteroid, classified as CU-type in the Tholen taxonomy, orbits the Sun at a distance of 2.6–3.7 AU once every 5 years and 8 months (2,060 days). Its orbit shows an eccentricity of 0.17 and is nearly coplanar to the plane of the ecliptic, with an orbital inclination of only 1 degree.[1] It has a well-defined rotation period of 10.27 hours[6][7] and an albedo of 0.05–0.07 determined by the Akari and WISE/NEOWISE surveys.[4][5]

It was named in honor of Dutch astronomer Jan Oort (1900–1992), director of the Leiden Observatory (1945–1970), president of the International Astronomical Union (1958–1961), and a well-known authority on stellar statistics and galactic structure.[2] He overturned the idea that the Sun was at the center of the Milky Way. The Oort cloud, the outermost gravitational bound region of the Solar System, was also named after him.

References

  1. ^ a b c d "JPL Small-Body Database Browser: 1691 Oort (1956 RB)" (2015-06-13 last obs.). Jet Propulsion Laboratory. Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  2. ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1691) Oort. Springer Berlin Heidelberg. p. 134. ISBN 978-3-540-29925-7. Retrieved November 2015. {{cite book}}: Check date values in: |accessdate= (help)
  3. ^ a b c d "LCDB Data for (1691) Oort". Asteroid Lightcurve Database (LCDB). Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  4. ^ a b c "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. October 2011. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Cite uses deprecated parameter |authors= (help)
  5. ^ a b c "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. November 2011. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Cite uses deprecated parameter |authors= (help)
  6. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1691) Oort". Geneva Observatory. Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  7. ^ a b "An anisotropic distribution of spin vectors in asteroid families". Astronomy & Astrophysics. 559: 19. November 2013. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Cite uses deprecated parameter |authors= (help)
  8. ^ "1691 Oort (1956 RB)". Minor Planet Center. Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)

External links


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