3401 Vanphilos
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 3401 Vanphilos
| background = #FA8072
| image =
| image_size =
| caption =
| discovered = 1 August 1981
| discoverer = Harvard College Obs.
| discovery_site = Oak Ridge Obs.
{{small|(Agassiz Stn.)}}
| mpc_name = (3401) Vanphilos
| alt_names = 1981 PA{{·}}1946 DA
| pronounced =
| named_after = Vanessa Hall
Philip Osborne
{{small|(friends of G. V. Williams)}}
| mp_category = Mars crosser
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 70.38 yr (25,708 days)
| aphelion = 3.2195 AU
| perihelion = 1.5147 AU
| semimajor = 2.3671 AU
| eccentricity = 0.3601
| period = 3.64 yr (1,330 days)
| mean_anomaly = 264.28°
| mean_motion = {{Deg2DMS|0.2706|sup=ms}} / day
| inclination = 21.797°
| asc_node = 322.38°
| arg_peri = 108.64°
| mars_moid = 0.1190 AU
| dimensions = {{val|7.023|1.045}} km
{{val|7.10|4.56}} km
10.30 km {{small|(calculated)}}
| rotation = {{val|4.225|0.001}} h
{{val|4.226|0.001}} h
{{val|4.2261|0.0005}} h{{efn|name=LCDB-Pravec-2008}}
{{val|4.227|0.005}} h
| albedo = 0.20 {{small|(assumed)}}
{{val|0.31|0.15}}
{{val|0.377|0.198}}
| spectral_type = SMASS = S{{·}}S
| abs_magnitude = {{val|12.29|0.27}}{{·}}12.3{{·}}12.65
}}
3401 Vanphilos, provisional designation {{mp|1981 PA}}, is a stony, eccentric asteroid and sizeable Mars-crosser, approximately 7 kilometers in diameter. It was discovered on 1 August 1981, by and at Harvard's Oak Ridge Observatory (Agassiz Station) in Massachusetts, United States.
Orbit and classification
Vanphilos orbits the Sun in the inner main-belt at a distance of 1.5–3.2 AU once every 3 years and 8 months (1,330 days). Its orbit has an eccentricity of 0.36 and an inclination of 22° with respect to the ecliptic. In 1946, it was first identified as {{mp|1946 DA}} at the Finnish Turku Observatory, extending the body's observation arc by 35 years prior to its official discovery at Harvard.
Physical characteristics
In the SMASS taxonomy, Vanphilos is characterized as a common S-type asteroid.
= Rotation period =
In February and March 2008, three rotational lightcurves of Vanphilos were obtained from photometric observations by astronomers Petr Pravec, James W. Brinsfield and Robert Stephens. Light-curve analysis gave a well defined rotation period of 4.225 and 4.226 hours, respectively, with a change in brightness between 0.50 and 0.54 magnitude ({{small|U=3/3/3}}).{{efn|name=LCDB-Pravec-2008}}
In August 2014, astronomer Brian Warner derived a concurring period of 4.227 hours with an amplitude of 0.62 magnitude from his observations taken at the Palmer Divide Station in Colorado ({{small|U=3}}). Light-curve plots were published on-line by the Ondřejov Observatory and the Center for Solar System Studies.{{efn|name=Lightcurve-plots-CS3}}{{efn|name=Lightcurve-plots-Ondrejov}}
= Diameter and albedo =
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Vanphilos measures 7.02 and 7.10 kilometers in diameter, and its surface has an albedo of 0.377 and 0.31, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 10.30 kilometers, as the lower the body's albedo (reflectivity), the larger its diameter, at a constant absolute magnitude.
Naming
This minor planet was named for Vanessa Hall and Philip Osborne, by astronomer G. V. William to celebrate their marriage on 3 August 1991. The approved naming citation was published by the Minor Planet Center on 25 August 1991 ({{small|M.P.C. 18644}}).
Notes
{{notelist|refs=
{{efn|name=LCDB-Pravec-2008|1=Pravec (2008) web: rotation period {{val|4.2261|0.0005}} hours with a brightness amplitude of 0.51 mag and quality code of 3. Summary figures for (3401) Vanphilos at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=3401%7CVanphilos Collaborative Asteroid Lightcurve Link (CALL)] and [http://www.asu.cas.cz/~ppravec/neo.htm Pravec, P.; Wolf, M.; Sarounova, L. (2008)] at Ondřejov Observatory}}
{{efn|name=Lightcurve-plots-CS3|1=Online published Lightcure plots of (3401) Vanphilos at the [http://www.planetarysciences.org/plots/BDW/3401_VANPHILOS_2014-08-15.PNG Center for Solar System Studies (CS3)] in 2014 }}
{{efn|name=Lightcurve-plots-Ondrejov|1=Online published [http://www.asu.cas.cz/~asteroid/03401.png lightcure plot] of (3401) Vanphilos at Ondřejov Observatory in 2008}}
}}
References
{{reflist|refs=
|type = 2016-07-09 last obs.
|title = JPL Small-Body Database Browser: 3401 Vanphilos (1981 PA)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2003401
|publisher = Jet Propulsion Laboratory
|access-date = 17 June 2017}}
|title = Dictionary of Minor Planet Names – (3401) Vanphilos
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 283
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_3401 |chapter = (3401) Vanphilos }}
|title = 3401 Vanphilos (1981 PA)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=3401
|access-date = 10 January 2017}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 10 January 2017}}
|title = LCDB Data for (3401) Vanphilos
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=3401%7CVanphilos
|access-date = 10 January 2017}}
|display-authors = 6
|first1 = C. R. |last1 = Nugent
|first2 = A. |last2 = Mainzer
|first3 = J. |last3 = Masiero
|first4 = J. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = T. |last6 = Grav
|first7 = E. |last7 = Kramer
|first8 = S. |last8 = Sonnett
|first9 = R. |last9 = Stevenson
|first10 = E. L. |last10 = Wright
|date = December 2015
|title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N
|journal = The Astrophysical Journal
|volume = 814
|issue = 2
|page = 13
|bibcode = 2015ApJ...814..117N
|doi = 10.1088/0004-637X/814/2/117
|access-date= 10 January 2017|arxiv = 1509.02522 |s2cid = 9341381 }}
|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 }}
|author = Brinsfield, James W.
|date = September 2008
|title = Asteroid Lightcurve Analysis at the Via Capote Observatory: First Quarter 2008
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35..119B
|journal = The Minor Planet Bulletin
|volume = 35
|issue = 3
|pages = 119–122
|issn = 1052-8091
|bibcode = 2008MPBu...35..119B
|access-date= 10 January 2017}}
|author = Stephens, Robert D.
|date = September 2008
|title = Asteroids Observed from GMARS and Santana Observatories - Late 2007 and Early 2008
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35..126S
|journal = The Minor Planet Bulletin
|volume = 35
|issue = 3
|pages = 126–128
|issn = 1052-8091
|bibcode = 2008MPBu...35..126S
|access-date= 10 January 2017}}
|author = Warner, Brian D.
|date = January 2015
|title = Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 June-October
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42...54W
|journal = The Minor Planet Bulletin
|volume = 42
|issue = 1
|pages = 54–60
|pmid = 32457970
|issn = 1052-8091
|bibcode = 2015MPBu...42...54W
|access-date= 10 January 2017}}
|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= 10 January 2017}}
}}
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|3401}}
- {{JPL small body}}
{{Minor planets navigator |3400 Aotearoa |number=3401 |3402 Wisdom}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Vanphilos}}