131 Vala
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=July 2020}}
{{Infobox planet
| minorplanet=yes
| background=#D6D6D6
| name=131 Vala
| discoverer=Christian Heinrich Friedrich Peters
| discovered=24 May 1873
| mpc_name=(131) Vala
| alt_names=A873 KA; 1945 KA;
{{mp|1952 DS|3}}; 1953 QE
| pronounced={{IPAc-en|'|v|ɑː|l|ə}}{{dict.com|Vala}}
| mp_category=Main belt
| epoch=31 July 2016 (JD 2457600.5)
| semimajor={{Convert|2.43198|AU|Gm|2|adj=ri2|abbr=on}}
| perihelion={{Convert|2.26604|AU|Gm|2|adj=ri2|abbr=on}}
| aphelion={{Convert|2.5979|AU|Gm|2|adj=ri2|abbr=on|lk=on}}
| eccentricity=0.068233
| period={{convert|1385.3|days|years|2|abbr=on|lk=on|order=flip}}
| inclination=4.9602°
| asc_node=65.682°
| arg_peri=160.641°
| mean_anomaly=289.275°
| avg_speed=19.08 km/s
| dimensions={{val|40.44|1.8|ul=km}}
| mass=6.9{{E|16}} kg
| density=
| surface_grav=0.0113 m/s²
| escape_velocity=0.0214 km/s
| rotation={{Convert|5.1812|h|d|abbr=on|lk=on}}
| spectral_type=K (Bus)
| albedo={{val|0.1051|0.010}}
| single_temperature=~178 K
| mean_motion={{Deg2DMS|0.25987|sup=ms}} / day
| observation_arc=142.88 yr (52187 d)
| uncertainty=0
| moid={{Convert|1.25637|AU|Gm|adj=ri2|2|abbr=on}}
| jupiter_moid={{Convert|2.37651|AU|Gm|adj=ri2|2|abbr=on}}
| tisserand=3.499
|image= Орбита астероида 131.png
|caption=Orbital diagram
|named_after= vǫlva
}}
131 Vala is an inner main-belt asteroid. It was discovered by C. H. F. Peters on 24 May 1873, and derives its name from völva (vǫlva, {{lit|staff bearer}}), a prophetess in Norse paganism. One observation of an occultation of a star by Vala is from Italy (26 May 2002). 10-μm radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 34 km.
In the Tholen classification system, it is categorized as an SU-type asteroid, while the Bus asteroid taxonomy system lists it as a K-type asteroid. Photometric observations of this asteroid during 2007 at the Organ Mesa Observatory in Las Cruces, New Mexico were used to create a "nearly symmetric bimodal" light curve plot. This showed a rotation period of 10.359 ± 0.001 hours and a brightness variation of 0.09 ± 0.02 magnitude during each cycle. The result is double the 5.18-hour period reported in the JPL Small-Body Database.
On 2028-Apr-05, Vala will pass {{convert|0.0276|AU|km mi|abbr=on|lk=on}} from asteroid 2 Pallas.
References
{{reflist|refs=
|type=2011-10-20 last obs (arc=138 years)
|title=JPL Small-Body Database Browser: 131 Vala
|url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=131
|publisher=Jet Propulsion Laboratory
|accessdate=12 May 2016}}
|type=2011-10-20 last obs (arc=138 years)
|title=JPL Close-Approach Data: 131 Vala
|url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=131;cad=1#cad
|accessdate=2011-12-07}}
{{Cite book |last=Schmadel |first=Lutz D.|authorlink=Lutz D. Schmadel|author2=International Astronomical Union |title=Dictionary of minor planet names |year=2003 |publisher=Springer-Verlag |location=Berlin; New York |isbn=978-3-540-00238-3 |page=27|url=https://books.google.com/books?id=KWrB1jPCa8AC&pg=PA27}}
| first1 = Frederick
| last1 = Pilcher
| title = Period Determination for 84 Klio, 98 Ianthe, 102 Miriam 112 Iphigenia, 131 Vala, and 650 Amalasuntha
| work = The Minor Planet Bulletin
| volume = 35
| issue = 2
| pages = 71–72
| date = June 2008
| doi = 10.1016/j.pss.2012.03.009
| bibcode = 2008MPBu...35...71P
| postscript= .| arxiv= 1203.4336
}}
| last1 = Morrison
| first1 = D.
| last2 = Chapman
| first2 = C. R.
| title = Radiometric diameters for an additional 22 asteroids
| work = Astrophysical Journal
| volume = 204
| pages = 934–939
| date = March 1976
| doi = 10.1142/9789812834300_0469
| bibcode = 2008mgm..conf.2594S
| postscript= .}}
|last1=DeMeo
|first1=Francesca E.
|last2=Binzel
|first2=Richard P.
|last3=Slivan
|first3=Stephen M.
|last4=Bus
|first4=Schelte J.
|display-authors=1
|title=An extension of the Bus asteroid taxonomy into the near-infrared
|work=Icarus
|volume=202
|issue=1
|pages=160–180
|date=July 2009
|doi=10.1016/j.icarus.2009.02.005
|bibcode=2009Icar..202..160D
|url=http://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016%252Fj.icarus.2009.02.005.pdf
|accessdate=2013-04-08
|postscript=.
|url-status=dead
|archiveurl=https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf
|archivedate=2014-03-17
}} See appendix A.
}}
Further reading
- {{citation
| title=Spin-Shape Model for 131 Vala
| display-authors=1 | last1=Franco | first1=Lorenzo
| last2=Pilcher | first2=Frederick | last3=Marchini | first3=Alessandro
| last4=Baj | first4=Giorgio | last5=Bacci | first5=Paolo
| last6=Maestripieri | first6=Martina | last7=Bacci | first7=Roberto
| journal=Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers
| volume=46 | issue=4 | pages=392–394 | date=October 2019
| bibcode=2019MPBu...46..392F }}
External links
- {{AstDys|131}}
- {{JPL small body}}
{{Minor planets navigator |130 Elektra |number=131 |132 Aethra}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:000131}}
Category:SU-type asteroids (Tholen)
Category:Xc-type asteroids (SMASS)
Category:Objects observed by stellar occultation
{{S-beltasteroid-stub}}