1064 Aethusa

{{Short description|Main-belt asteroid}} {{Use dmy dates|date=October 2019}} {{Infobox planet | minorplanet = yes | name = 1064 Aethusa | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = <ref name="jpldata" /> | discoverer = K. Reinmuth | discovery_site = Heidelberg Obs. | discovered = 2 August 1926 | mpc_name = (1064) Aethusa | alt_names = 1926 PA{{·}}1962 HF | pronounced = {{IPAc-en|iː|'|θj|uː|s|@}}<ref>John Walker (1808) ''A Key to the Classical Pronunciation of Greek, Latin, and Scripture Proper Names''</ref> | named_after = ''Aethusa cynapium'' {{small|(fool's parsley)}}<ref name="springer" /> | mp_category = main-belt{{·}}{{small|(middle)}} | orbit_ref = <ref name="jpldata" /> | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 90.66 yr (33,112 days) | aphelion = 2.9930 AU | perihelion = 2.0917 AU | semimajor = 2.5424 AU | eccentricity = 0.1773 | period = 4.05 yr (1,481 days) | mean_anomaly = 165.59° | mean_motion = {{Deg2DMS|0.2431|sup=ms}} / day | inclination = 9.5020° | asc_node = 280.57° | arg_peri = 20.515° | dimensions = {{val|17.42|3.60}} km<ref name="Nugent-2016" /> 18.56 km {{small|(derived)}}<ref name="lcdb" /> {{val|18.66|0.9}} km<ref name="SIMPS" /> {{val|19.77|0.36}} km<ref name="AKARI" /> {{val|20.007|0.173}} km<ref name="Masiero-2014" /> {{val|22.377|0.131}} km<ref name="WISE" /> {{val|25.361|4.376}} km<ref name="Ryan-2015" /> | rotation = {{val|8.621|0.004}} h<ref name="Warner-2006m" />{{efn|name=lightcurveplot}} {{val|12.916|0.002}} h<ref name="geneva-obs" /> | albedo = {{val|0.160|0.087}}<ref name="Ryan-2015" /> {{val|0.2282|0.0133}}<ref name="WISE" /> {{val|0.27|0.12}}<ref name="Nugent-2016" /> {{val|0.278|0.046}}<ref name="Masiero-2014" /> {{val|0.288|0.012}}<ref name="AKARI" /> 0.2952 {{small|(derived)}}<ref name="lcdb" /> {{val|0.3202|0.034}}<ref name="SIMPS" /> | spectral_type = S<ref name="lcdb" /> | abs_magnitude = 10.50<ref name="SIMPS" /><ref name="AKARI" /><ref name="WISE" /><ref name="Ryan-2015" />{{·}}10.6<ref name="jpldata" /><ref name="lcdb" />{{·}}{{val|10.75|0.20}}<ref name="Veres-2015" />{{·}}10.88<ref name="Nugent-2016" /> }}

'''1064 Aethusa''', provisional designation {{mp|1926 PA}}, is a stony background asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 2 August 1926, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.<ref name="MPC-object" /> The asteroid was named after the plant ''Aethusa cynapium'' (fool's parsley).<ref name="springer" />

== Orbit and classification ==

''Aethusa'' is a background asteroid with no associated asteroid family. It orbits the Sun in the central main belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,481 days). Its orbit has an eccentricity of 0.18 and an inclination of 10° with respect to the ecliptic.<ref name="jpldata" /> The observation arc begins at Heidelberg/Simeiz Observatory two nights after the asteroid's official discovery observation.<ref name="MPC-object" />

== Physical characteristics ==

''Aethusa'' is an assumed stony S-type asteroid, the most common type in the inner part of the central asteroid belt.

=== Rotation period ===

In November 2004, a rotational lightcurve of ''Aethusa'' was obtained from photometric observations by French amateur astronomer René Roy at Blauvac Observatory ({{small|627}}). Lightcurve analysis gave a rotation period of 12.916 hours with a brightness variation of 0.12 magnitude ({{small|U=2}}), while in March 2006, astronomer Brian Warner at his Palmer Divide observatory in Colorado, United States, obtained a shorter period of 8.621 hours and an amplitude of 0.18 magnitude ({{small|U=2}}).<ref name="Warner-2006m" /><ref name="geneva-obs" />{{efn|name=lightcurveplot}}

=== Diameter and albedo ===

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, the MIPS photometer on the Spitzer Space Telescope, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Aethusa'' measures between 17.42 and 25.361 kilometers in diameter and its surface has an albedo between 0.160 and 0.3202.<ref name="Nugent-2016" /><ref name="SIMPS" /><ref name="AKARI" /><ref name="Masiero-2014" /><ref name="WISE" /><ref name="Ryan-2015" />

The ''Collaborative Asteroid Lightcurve Link'' derives a high albedo of 0.2952 and a diameter of 18.56 kilometers based on an absolute magnitude of 10.6.<ref name="lcdb" />

== Naming ==

This minor planet was named after the genus "Aethusa" in the carrot family, of which the plant ''Aethusa cynapium'' – commonly known as fool's parsley, fool's cicely, or poison parsley – is the only member. The official naming citation was mentioned in ''The Names of the Minor Planets'' by Paul Herget in 1955 ({{small|H 101}}).<ref name="springer" />

== See also == * {{section link|List of minor planets named after animals and plants|Plants}}

== Notes == {{notelist|refs=

{{efn|name=lightcurveplot|1={{usurped|1=[https://web.archive.org/web/20201003213549/http://www.minorplanetobserver.com/pdolc/A1064_2006.HTM Lightcurve plot of 1064 Aethusa]}}, Palmer Divide Observatory, Brian D. Warner (2006)}}

}}

== References == {{reflist|30em|refs=

<ref name="jpldata">{{cite web |type = 2017-03-29 last obs. |title = JPL Small-Body Database Browser: 1064 Aethusa (1926 PA) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001064 |publisher = Jet Propulsion Laboratory |accessdate = 30 August 2017}}</ref>

<ref name="springer">{{cite book |title = Dictionary of Minor Planet Names – (1064) Aethusa |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 91 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1065 |chapter = (1064) Aethusa }}</ref>

<ref name="MPC-object">{{cite web |title = 1064 Aethusa (1926 PA) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1064 |accessdate = 30 August 2017}}</ref>

<ref name="geneva-obs">{{cite web |title = Asteroids and comets rotation curves – (1064) Aethusa |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page3cou.html#001064 |accessdate = 30 August 2017}}</ref>

<ref name="Masiero-2014">{{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = T. |last2 = Grav |first3 = A. K. |last3 = Mainzer |first4 = C. R. |last4 = Nugent |first5 = J. M. |last5 = Bauer |first6 = R. |last6 = Stevenson |first7 = S. |last7 = Sonnett |date = August 2014 |title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M |journal = The Astrophysical Journal |volume = 791 |issue = 2 |page = 11 |bibcode = 2014ApJ...791..121M |doi = 10.1088/0004-637X/791/2/121 |arxiv = 1406.6645 |s2cid = 119293330 |access-date= 30 August 2017}}</ref>

<ref name="lcdb">{{cite LCDB|number = 1064 |accessdate = 30 August 2017}}</ref>

<ref name="Ryan-2015">{{Cite journal |display-authors = 6 |first1 = E. L. |last1 = Ryan |first2 = D. R. |last2 = Mizuno |first3 = S. S. |last3 = Shenoy |first4 = C. E. |last4 = Woodward |first5 = S. J. |last5 = Carey |first6 = A. |last6 = Noriega-Crespo |first7 = K. E. |last7 = Kraemer |first8 = S. D. |last8 = Price |date = June 2015 |title = The kilometer-sized Main Belt asteroid population revealed by Spitzer |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015A&A...578A..42R |journal = Astronomy and Astrophysics |volume = 578 |page = 12 |bibcode = 2015A&A...578A..42R |doi = 10.1051/0004-6361/201321375 |access-date= 30 August 2017 |arxiv = 1204.1116}}</ref>

<ref name="Nugent-2016">{{cite journal |display-authors = 6 |first1 = C. R. |last1 = Nugent |first2 = A. |last2 = Mainzer |first3 = J. |last3 = Bauer |first4 = R. M. |last4 = Cutri |first5 = E. A. |last5 = Kramer |first6 = T. |last6 = Grav |first7 = J. |last7 = Masiero |first8 = S. |last8 = Sonnett |first9 = E. L. |last9 = Wright |date = September 2016 |title = NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos |journal = The Astronomical Journal |volume = 152 |issue = 3 |page = 12 |bibcode = 2016AJ....152...63N |doi = 10.3847/0004-6256/152/3/63 |arxiv = 1606.08923 |doi-access = free }}</ref>

<ref name="AKARI">{{cite journal |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 |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |doi-access= }} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=1064 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])</ref>

<ref name="SIMPS">{{cite journal |first1 = E. F. |last1 = Tedesco |first2 = P. V. |last2 = Noah |first3 = M. |last3 = Noah |first4 = S. D. |last4 = Price |date = October 2004 |title = IRAS Minor Planet Survey V6.0 |url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |journal = NASA Planetary Data System |volume = 12 |pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |accessdate = 22 October 2019}}</ref>

<ref name="WISE">{{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407|s2cid = 35447010 }}</ref>

<ref name="Warner-2006m">{{Cite journal |author = Warner, Brian D. |date = December 2006 |title = Asteroid lightcurve analysis at the Palmer Divide Observatory - March - June 2006 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2006MPBu...33...85W |journal = The Minor Planet Bulletin |volume = 33 |issue = 4 |pages = 85–88 |issn = 1052-8091 |bibcode = 2006MPBu...33...85W |access-date= 30 August 2017}}</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 |s2cid = 53493339 |access-date= 30 August 2017}}</ref>

}}

== 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|1064}} * {{JPL small body}}

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{{DEFAULTSORT:Aethusa}} 001064 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19260802