1102 Pepita
{{Short description|Stony background asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1102 Pepita
| background = #D6D6D6
| image = 1102Pepita (Lightcurve Inversion).png
| image_scale =
| caption = Lightcurve-based 3D-model of Pepita
| discoverer = J. Comas Solà
| discovery_site = Fabra Obs.
| discovered = 5 November 1928
| mpc_name = (1102) Pepita
| alt_names = 1928 VA{{·}}1960 WQ
A899 KB
| pronounced =
| named_after = Josep Comas i Solà
{{small|(discoverer himself)}}
| mp_category = main-belt{{·}}{{small|(outer)}}
background
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 86.24 yr (31,499 days)
| aphelion = 3.4119 AU
| perihelion = 2.7311 AU
| semimajor = 3.0715 AU
| eccentricity = 0.1108
| period = 5.38 yr (1,966 days)
| mean_anomaly = 267.80°
| mean_motion = {{Deg2DMS|0.1831|sup=ms}} / day
| inclination = 15.828°
| asc_node = 216.59°
| arg_peri = 116.55°
| mean_diameter = {{val|30.88|1.59|ul=km}}
{{val|36.632|0.378|u=km}}
{{val|39.27|2.1|u=km}}
{{val|41.02|0.74|u=km}}
{{val|41.733|0.308|u=km}}
| rotation = {{val|5.1|0.1|ul=h}}
{{val|5.1040|0.0003|u=h}}
{{val|5.10532|0.00005|u=h}}
{{val|5.1054|0.0002|u=h}}
| albedo = {{val|0.1842|0.0220}}
{{val|0.188|0.007}}
{{val|0.1991|0.023}}
{{val|0.229|0.054}}
{{val|0.322|0.058}}
| spectral_type = Tholen {{=}} C
SMASS {{=}} S
B–V {{=}} 0.724
U–B {{=}} 0.424
| abs_magnitude = {{val|8.68|0.65}}
9.40
}}
1102 Pepita, provisional designation {{mp|1928 VA}}, is a stony background asteroid from the outer regions of the asteroid belt, approximately 39 kilometers in diameter. It was discovered on 5 November 1928, by Catalan astronomer Josep Comas i Solà at the Fabra Observatory in Barcelona, Spain. It was named after the discoverer by the feminine form of his nickname. The asteroid has a rotation period of 5.1 hours.
Orbit and classification
Pepita is a non-family asteroid from the main belt's background population. It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.4 AU once every 5 years and 5 months (1,966 days; semi-major axis of 3.07 AU). Its orbit has an eccentricity of 0.11 and an inclination of 16° with respect to the ecliptic.
In May 1899, the asteroid was first observed as {{mp|A899 KB}} at Harvard's Boyden Station in Arequipa, Peru ({{small|800}}). The body's observation arc begins with its official discovery observation at Barcelona.
Physical characteristics
In the SMASS classification, Pepita is a stony S-type asteroid, which agrees with the body's measured geometric albedo (see below). Conversely, it is also classified as a carbonaceous C-type asteroid by Tholen.
= Rotation period and poles =
Three rotational lightcurves of Pepita were obtained from photometric observations by astronomers Hilari Pallares and Enric Forné (2006, {{small|U=2}}), Pierre Antonini and René Roy (2007, {{small|U=3}}), as well as by Robert Stephens (2007, {{small|U=3}}). The consolidated lightcurve gave a well-defined rotation period of 5.1054 hours with a brightness amplitude between 0.31 and 0.36 magnitude.
In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue and other sources gave a concurring sidereal period 5.10532 hours, as well as two spin axes of (25.0°, −34.0°) and (231.0°, −30.0°) in ecliptic coordinates (λ, β).
= 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, Pepita measures between 30.88 and 41.733 kilometers in diameter and its surface has an albedo between 0.1842 and 0.322.
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.1991 and a diameter of 39.27 kilometers based on an absolute magnitude of 9.40.
Naming
This minor planet was named after the discoverer, Josep Comas i Solà (1868–1937), by the feminine form of his nickname, "Pepito". He was the first director of the discovering Fabra Observatory and founded the Astronomical Society of Spain and America ({{langx|es|Sociedad Astronomica de España y América}}, SADEYA).
The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 104}}). The asteroid 1655 Comas Solà is also named after him, as is the Martian crater Comas Sola.{{GPN|1276|name=Martian crater Comas Solá}}
References
{{reflist|30em|refs=
|type = 2017-07-05 last obs.
|title = JPL Small-Body Database Browser: 1102 Pepita (1928 VA)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001102
|publisher = Jet Propulsion Laboratory
|accessdate = 2 February 2018}}
|title = Dictionary of Minor Planet Names – (1102) Pepita
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 94
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1103 }}
|title = 1102 Pepita (1928 VA)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1102
|accessdate = 2 February 2018}}
|title = Asteroids and comets rotation curves – (1102) Pepita
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page3cou.html#001102
|accessdate = 2 February 2018}}
|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
|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
}}
|title = Asteroid 1102 Pepita – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1102
|access-date= 28 October 2019}}
|title = LCDB Data for (1102) Pepita
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1102%7CPepita
|accessdate = 2 February 2018}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = C. |last6 = Nugent
|first7 = M. S. |last7 = Cabrera
|date = November 2012
|title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|journal = The Astrophysical Journal Letters
|volume = 759
|issue = 1
|page = 5
|bibcode = 2012ApJ...759L...8M
|doi = 10.1088/2041-8205/759/1/L8
|arxiv = 1209.5794
}}
|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}}
|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
}}
|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=1102 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
|first1 = Robert D. |last1 = Stephens
|first2 = Pedro V. |last2 = Sada
|date = December 2007
|title = Lightcurve Analysis of 1102 Pepita
|journal = The Minor Planet Bulletin
|volume = 34
|issue = 4
|page = 111
|issn = 1052-8091
|bibcode = 2007MPBu...34..111S
}}
|display-authors = 6
|author = Hanus, J.
|author2 = Durech, J.
|author3 = Broz, M.
|author4 = Warner, B. D.
|author5 = Pilcher, F.
|author6 = Stephens, R.
|author7 = Oey, J.
|author8 = Bernasconi, L.
|author9 = Casulli, S.
|author10 = Behrend, R.
|author11 = Polishook, D.
|author12 = Henych, T.
|author13 = Lehký, M.
|author14 = Yoshida, F.
|author15 = Ito, T.
|date = June 2011
|title = A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method
|journal = Astronomy & Astrophysics
|volume = 530
|page = 16
|bibcode = 2011A&A...530A.134H
|doi = 10.1051/0004-6361/201116738
|arxiv = 1104.4114
}}
|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
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
}}
}}
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|1102}}
- {{JPL small body}}
{{Minor planets navigator |1101 Clematis |number=1102 |1103 Sequoia}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Pepita}}