1704 Wachmann
{{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;}}
| discovered = 7 March 1924
| discoverer = K. Reinmuth
| discovery_site = Heidelberg Obs.
| mpc_name = (1704) Wachmann
| alt_names = A924 EE{{·}}1947 CE
1957 BJ
| pronounced =
| named_after = Arno Wachmann
{{small|(German astronomer)}}
| mp_category = main-belt{{·}}{{small|(inner)}}
| 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}}
{{val|6.934|0.070}} km
7.82 km {{small|(calculated)}}
| rotation = {{val|3.314|0.001}} h
| albedo = {{val|0.1767|0.0133}}
{{val|0.193|0.036}}
0.20 {{small|(assumed)}}
| spectral_type = S
| abs_magnitude = 12.9{{·}}{{val|12.97|0.13}}{{·}}13.3
}}
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.
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. No precoveries were taken. The asteroid's observation arc begins 3 days after its official discovery observation.
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}}).
= 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, 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.
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. The official {{MoMP|1704|naming citation}} was published by the Minor Planet Center on 20 February 1976 ({{small|M.P.C. 3933}}).
References
{{reflist|refs=
|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}}
|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 }}
|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}}
|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}}
|title = LCDB Data for (1704) Wachmann
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1704%7CWachmann
|accessdate = 20 July 2016}}
|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}}
|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}}
|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}}
|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}}
}}
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}}
{{Minor planets navigator |1703 Barry |number=1704 |1705 Tapio}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Wachmann}}