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167 Urda

{{Short description|Main-belt asteroid}}

{{Use dmy dates|date=October 2019}}

{{Infobox planet

| minorplanet=yes

| name=167 Urda

| image= 167Urda (Lightcurve Inversion).png

| image_scale =

| caption=A three-dimensional model of 167 Urda based on its light curve.

| background=#D6D6D6

| discovery_ref=

| discoverer=C. H. F. Peters

| discovery_site=Clinton, New York

| discovered=28 August 1876

| mpc_name=(167) Urda

| pronounced= {{IPAc-en|'|ɜːr|d|ə}}

| alt_names=A876 QA; 1899 KC;
1905 QA; 1906 WA

| named_after=Urd

| mp_category=main belt (Koronis asteroid family)

| orbit_ref=

| epoch=31 July 2016 (JD 2457600.5)

| semimajor={{Convert|2.8538511|AU|Gm|abbr=on}}

| perihelion={{Convert|2.7493497|AU|Gm|abbr=on}}

| aphelion={{Convert|2.9583526|AU|Gm|abbr=on|lk=on}}

| eccentricity=0.0366177

| period=4.82 yr (1760.9 d)

| inclination=2.212408°

| asc_node=166.21859°

| arg_peri=133.03586°

| mean_anomaly=37.607175°

| avg_speed=

| dimensions={{val|39.94|1.9|ul=km}}

| mass=

| density=

| surface_grav=

| escape_velocity=

| rotation={{Convert|13.07|h|d|abbr=on|lk=on}}

| spectral_type=S

| magnitude=

| abs_magnitude=9.1

| albedo={{val|0.2230|0.023}}

| single_temperature=

| mean_motion={{Deg2DMS|0.2044359|sup=ms}} / day

| observation_arc=132.01 yr (48218 d)

| uncertainty=0

| moid={{Convert|1.73392|AU|Gm|abbr=on}}

| jupiter_moid={{Convert|2.10867|AU|Gm|abbr=on}}

| tisserand=3.302

}}

167 Urda is a main-belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on August 28, 1876, in Clinton, New York, and named after Urd, one of the Norns in Norse mythology. In 1905, Austrian astronomer Johann Palisa showed that the asteroid varied in brightness.

Photometric observations of this asteroid at the Palmer Divide Observatory in Colorado Springs, Colorado, during 2007–8 gave a light curve with a period of 13.06133 ± 0.00002 hours. This S-type asteroid is a member of the Koronis family of asteroids that share similar orbital elements.

In 2002, a diameter estimate of 37.93 ± 3.17 km was obtained from the Midcourse Space Experiment observations, with an albedo of 0.2523 ± 0.0448.

A stellar occultation by Urda was observed from Japan on July 23, 2001.{{Cite web|url=http://mpocc.astro.cz/world/mpocc1.txt|title=Observed Minor Planet Occultation Events - Asteroidal Occultations|access-date=2018-10-14}}

References

{{Reflist|refs=

{{Citation

| first1 = Donald K.

| last1 = Yeomans

| title = 167 Urda

| work = JPL Small-Body Database Browser

| publisher = NASA Jet Propulsion Laboratory

| url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=167

| accessdate= 12 May 2016

| postscript= .}}

{{Citation

| editor1-first = Patrick

| editor1-last = Moore

| editor1-link = Patrick Moore

| editor2-first = Robin

| editor2-last = Rees

| title = Patrick Moore's Data Book of Astronomy

| publisher = Cambridge University Press

| edition = 2nd

| year = 2011

| pages = 164–165

| url = https://books.google.com/books?id=2FNfjWKBZx8C&pg=PA165

| postscript= .}}

{{Citation

| last1 = Warner

| first1 = Brian D.

| last2 = Durech

| first2 = Josef

| last3 = Fauerbach

| first3 = Michael

| last4 = Marks

| first4 = Scott

| display-authors = 1

| title = Shape and Spin Models for Four Asteroids

| work = The Minor Planet Bulletin

| volume = 35

| issue = 4

| pages = 167–171

|date=October 2008

| bibcode = 2008MPBu...35..167W

| postscript= .}}

{{Citation

| last1 = Maddrill

| first1 = James D.

| title = Variable Asteroid (167) Urda

| work = Publications of the Astronomical Society of the Pacific

| volume = 17

| issue = 105

| pages = 190–192

|date=December 1905

| jstor = 40691277

| bibcode = 1905PASP...17..186.

| doi = 10.1086/121648

| postscript= .| doi-access= free

}}

{{Citation

| last1 = Tedesco

| first1 = Edward F.

| last2 = Egan

| first2 = Michael P.

| last3 = Price

| first3 = Stephan D.

| display-authors = 1

| title = The Midcourse Space Experiment Infrared Minor Planet Survey

| work = The Astronomical Journal

| volume = 124

| issue = 124

| pages = 583–591

|date=July 2002

| doi = 10.1086/340960

| bibcode = 2002AJ....124..583T

| postscript= .| doi-access= free

}}

}}

External links

  • [http://www.minorplanetobserver.com/pdolc/A167_2007.HTM Lightcurve plot of 167 Urda], Palmer Divide Observatory, B. D. Warner (2007)
  • [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|167}}
  • {{JPL small body}}

{{Minor planets navigator |166 Rhodope |number=167 |168 Sibylla}}

{{Small Solar System bodies}}

{{Authority control}}

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Category:Koronis asteroids

Urda

Urda

Category:S-type asteroids (Tholen)

Category:Sk-type asteroids (SMASS)

18760828

Category:Objects observed by stellar occultation

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