{{Short description|Main-belt asteroid}} {{Use dmy dates|date=October 2019}} {{Infobox planet | minorplanet = yes | name = 1704 Wachmann | background = #D6D6D6 | image = 1704Wachmann (Lightcurve Inversion).png | image_scale = | caption = {{longitem|Light curve based 3D-model of ''Wachmann''|style=padding: 5px 0;}} | discovery_ref = <ref name="jpldata" /> | discovered = 7 March 1924 | discoverer = K. Reinmuth | discovery_site = Heidelberg Obs. | mpc_name = (1704) Wachmann | alt_names = A924 EE{{·}}1947 CE<br />1957 BJ | pronounced = | named_after = Arno Wachmann<br />{{small|(German astronomer)}}<ref name="springer" /> | mp_category = main-belt{{·}}{{small|(inner)}}<ref name="lcdb" /> | orbit_ref = <ref name="jpldata" /> | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 93.16 yr (34,026 days) | aphelion = 2.4163 AU | perihelion = 2.0292 AU | semimajor = 2.2228 AU | eccentricity = 0.0871 | period = 3.31 yr (1,210 days) | mean_anomaly = 67.047° | mean_motion = {{Deg2DMS|0.2974|sup=ms}} / day | inclination = 0.9715° | asc_node = 259.47° | arg_peri = 280.77° | dimensions = {{val|6.618|0.070}}<ref name="Masiero-2014" /><br />{{val|6.934|0.070}} km<ref name="WISE" /><br />7.82 km {{small|(calculated)}}<ref name="lcdb" /> | rotation = {{val|3.314|0.001}} h<ref name="Julian-2008" /> | albedo = {{val|0.1767|0.0133}}<ref name="WISE" /><br />{{val|0.193|0.036}}<ref name="Masiero-2014" /><br />0.20 {{small|(assumed)}}<ref name="lcdb" /> | spectral_type = S<ref name="lcdb" /> | abs_magnitude = 12.9<ref name="jpldata" /><ref name="lcdb" />{{·}}{{val|12.97|0.13}}<ref name="Veres-2015" />{{·}}13.3<ref name="WISE" /> }}
'''1704 Wachmann''', provisional designation {{mp|A924 EE}}, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 7 March 1924. It was later named after astronomer Arno Wachmann.<ref name="springer" /><ref name="MPC-Wachmann" />
== Classification and orbit ==
The S-type asteroid orbits the Sun in the inner main-belt at a distance of 2.0–2.4 AU once every 3 years and 4 months (1,210 days). Its orbit has an eccentricity of 0.09 and an inclination of 1° with respect to the ecliptic.<ref name="jpldata" /> No precoveries were taken. The asteroid's observation arc begins 3 days after its official discovery observation.<ref name="MPC-Wachmann" />
== Physical characteristics ==
=== Lightcurves ===
In April 2007, a rotational lightcurve ''Wachmann'' was obtained at the U.S. Sandia View Observatory in New Mexico ({{small|H03}}). Lightcurve analysis gave a well-defined rotation period of {{val|3.314|0.001}} hours with a brightness variation of 0.40 magnitude ({{small|U=3}}).<ref name="Julian-2008" />
=== Diameter and albedo ===
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Wachmann'' measures 6.6 and 6.9 kilometers in diameter, and its surface has an albedo of 0.177 and 0.193, respectively,<ref name="Masiero-2014" /><ref name="WISE" /> while the ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.8 kilometers, based on an absolute magnitude of 12.9.<ref name="lcdb" />
== Naming ==
This minor planet was named for Arno Wachmann (1902–1990), long-time astronomer at the Bergedorf Observatory in Hamburg, discoverer of minor planets and comets, and observer of variable and binary stars. He is best known for the co-discovery of the three "Schwassmann–Wachmann" comets, 29P, 31P and 73P.<ref name="springer" /> The official {{MoMP|1704|naming citation}} was published by the Minor Planet Center on 20 February 1976 ({{small|M.P.C. 3933}}).<ref name="DoMP-Circular-dates" />
== References == <references>
<ref name="jpldata">{{cite web |type = 2017-05-05 last obs. |title = JPL Small-Body Database Browser: 1704 Wachmann (A924 EE) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001704 |publisher = Jet Propulsion Laboratory |accessdate = 7 June 2017}}</ref>
<ref name="springer">{{cite book |title = Dictionary of Minor Planet Names – (1704) Wachmann |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |pages = 135–136 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1705 |chapter = (1704) Wachmann }}</ref>
<ref name="MPC-Wachmann">{{cite web |title = 1704 Wachmann (A924 EE) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1704 |accessdate = 20 July 2016}}</ref>
<ref name="DoMP-Circular-dates">{{cite book |title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) |chapter = Appendix – Publication Dates of the MPCs |last = Schmadel |first=Lutz D. |publisher = Springer Berlin Heidelberg |page = 221 |isbn = 978-3-642-01964-7 |doi = 10.1007/978-3-642-01965-4}}</ref>
<ref name="lcdb">{{cite LCDB|number = 1704 |accessdate = 20 July 2016}}</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}}</ref>
<ref name="Julian-2008">{{Cite journal |last = Julian, II |first = William M. |date = March 2008 |title = Period Determination for 1704 Wachmann |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35....4J |journal = The Minor Planet Bulletin |volume = 35 |issue = 1 |page = 4 |issn = 1052-8091 |bibcode = 2008MPBu...35....4J |access-date= 20 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= 20 July 2016}}</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 |access-date= 8 December 2016}}</ref>
</references> <!-- 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] {{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|1704}} * {{JPL small body}}
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{{DEFAULTSORT:Wachmann}} 001704 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19240307