1101 Clematis
{{Short description|Asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1101 Clematis
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = K. Reinmuth
| discovery_site = Heidelberg Obs.
| discovered = 22 September 1928
| mpc_name = (1101) Clematis
| alt_names = 1928 SJ{{·}}1928 WB
{{mp|1963 TG|1}}{{·}}{{mp|1969 TG|1}}
| pronounced = {{IPAc-en|ˈ|k|l|ɛ|m|ə|t|ᵻ|s}}{{OED|clematis}}
| adjective = Clematidian
| named_after = κληματίς clēmatis
{{small|(flowering plant)}}
| mp_category = main-belt{{·}}{{small|(outer)}}
Alauda
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 89.17 yr (32,571 days)
| aphelion = 3.4833 AU
| perihelion = 2.9770 AU
| semimajor = 3.2302 AU
| eccentricity = 0.0784
| period = 5.81 yr (2,120 days)
| mean_anomaly = 151.11°
| mean_motion = {{Deg2DMS|0.1698|sup=ms}} / day
| inclination = 21.424°
| asc_node = 201.98°
| arg_peri = 107.54°
| dimensions = {{val|29.13|1.62}} km
{{val|29.65|1.21}} km
{{val|33.765|0.809}} km
37.60 km {{small|(derived)}}
{{val|37.86|1.4}} km
| rotation = {{val|6}} h
{{val|8.5994|0.0006}} h
{{val|8.61|0.02}} h
{{val|12.68|0.01}} h
{{val|34.3|0.1}} h{{efn|name=lightcurve-plot-Warner}}
| albedo = 0.0788 {{small|(derived)}}
{{val|0.1124|0.009}}
{{val|0.127|0.019}}
{{val|0.190|0.023}}
| spectral_type = C {{small|(assumed)}}
| abs_magnitude = 10.10{{·}}10.50{{·}}10.6{{·}}{{val|10.64|0.28}}
}}
1101 Clematis {{IPAc-en|ˈ|k|l|ɛ|m|ə|t|ᵻ|s}} is an Alauda asteroid from the outermost regions of the asteroid belt, approximately 37 kilometers in diameter. It was discovered on 22 September 1928, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany, and assigned the provisional designation {{mp|1928 SJ}}. It was named for the flowering plant Clematis. The presumably carbonaceous asteroid has a relatively long rotation period of 34.3 hours.
Orbit and classification
Clematis is a member of the Alauda family ({{small|902}}), a large family of typically "bright" carbonaceous asteroids and named after its parent body, 702 Alauda.{{rp|23}} According to a different study, this object is also the namesake of the Clematis family, a small family of 5–16 asteroids hence they may have arisen from the same collisional event. All members have a relatively high orbital inclination.
It orbits the Sun in the outermost asteroid belt at a distance of 3.0–3.5 AU once every 5 years and 10 months (2,120 days; semi-major axis of 3.23 AU). Its orbit has an eccentricity of 0.08 and an inclination of 21° with respect to the ecliptic.
The body's observation arc begins with its observation as {{mp|1963 TG|1}} at Goethe Link Observatory in October 1963, more than 35 years after its official discovery observation at Heidelberg.
Physical characteristics
Clematis is an assumed carbonaceous C-type asteroids, while the overall spectral type for members of the Alauda family is that of a somewhat brighter B-type.{{rp|23}}
= Rotation period =
In September 2009, a rotational lightcurve{{efn|name=lightcurve-plot-Warner}} of Clematis was obtained from photometric observations by American astronomers Brian Warner at the Palmer Divide Observatory, Colorado, and by Robert Stephens at GMARS ({{small|G79}}, California. Lightcurve analysis gave a synodic rotation period of 34.3 hours with a brightness amplitude of 0.16 magnitude ({{small|U=2}}), which significantly differs from previously reported periods of 6 to 12.68 hours ({{small|U=1/2/2/2}}). While not being a slow rotator, Clematis has a much longer period than that known for most other asteroids, and its small amplitude is indicative for a rather spheroidal shape.
= Diameter and albedo =
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Clematis measures between 29.13 and 37.86 kilometers in diameter and its surface has an albedo between 0.1124 and 0.190.
The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0788 and a diameter of 37.60 kilometers based on an absolute magnitude of 10.5.
Naming
This minor planet was named after the flowering plant Clematis, a genus within the Ranunculaceae (buttercup or crowfoot family). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H n.a.}}).
= Reinmuth's flowers =
Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between {{MoMP|1009|(1009)}} and {{MoMP|1200|(1200)}}. This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants).
Notes
{{notelist|refs=
{{efn|name=lightcurve-plot-Warner|1=[http://www.minorplanetobserver.com/pdolc/A1101_2009.HTM Lightcurve plot of 1101 Clematis], Palmer Divide Observatory, B. D. Warner (2009): rotation period {{val|34.3|0.1}} hours with a brightness amplitude of {{val|0.16|0.02}} mag. Quality code of 2. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1101%7CClematis LCDB]}}
}}
References
{{reflist|30em|refs=
|type = 2017-11-25 last obs.
|title = JPL Small-Body Database Browser: 1101 Clematis (1928 SJ)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001101
|publisher = Jet Propulsion Laboratory
|accessdate = 12 January 2018}}
|last = Schmadel | first = Lutz D.
|title = Dictionary of Minor Planet Names |publisher = Springer Berlin Heidelberg
|page = 93
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1102 |chapter = (1101) Clematis }}
|last = Schmadel
|first = Lutz D.
|title = Dictionary of Minor Planet Names
|publisher = Springer Berlin Heidelberg
|page = 90
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1055
|chapter = (1054) Forsytia}}
|title = 1101 Clematis (1928 SJ)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1101
|accessdate = 12 January 2018}}
|title = Asteroids and comets rotation curves – (1101) Clematis
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page3cou.html#001101
|accessdate = 12 January 2018}}
|title = Asteroid 1101 Clematis – Nesvorny HCM Asteroid Families V3.0
|work = Small Bodies Data Ferret
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}}
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|arxiv = 1108.3740|s2cid = 54772591
}}
|title = LCDB Data for (1101) Clematis
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1101%7CClematis
|accessdate = 12 January 2018}}
|first1 = E. F. |last1 = Tedesco
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|journal = NASA Planetary Data System
|volume = 12
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|bibcode = 2004PDSS...12.....T
|accessdate = 22 October 2019}}
|display-authors = 6
|first1 = Fumihiko |last1 = Usui
|first2 = Daisuke |last2 = Kuroda
|first3 = Thomas G. |last3 = Müller
|first4 = Sunao |last4 = Hasegawa
|first5 = Masateru |last5 = Ishiguro
|first6 = Takafumi |last6 = Ootsubo
|first7 = Daisuke |last7 = Ishihara
|first8 = Hirokazu |last8 = Kataza
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|first10 = Shinki |last10 = Oyabu
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|author = Stephens, Robert D.
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|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004MPBu...31....4S
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|access-date= 12 January 2018}}
|first1 = Brian D. |last1 = Warner
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|date = April 2010
|title = Analysis of the Lightcurve of 1101 Clematis
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...73W
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|access-date= 12 January 2018}}
|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
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|first16 = John L. |last16 = Tonry
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|date = November 2015
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}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [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
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|1101}}
- {{JPL small body}}
{{Minor planets navigator |1100 Arnica |number=1101 |1102 Pepita}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Clematis}}