# 189 Phthia

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{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
 | minorplanet     = yes
 | background      = #D6D6D6
 | name            = 189 Phthia
 | symbol          = 
|image=000189-asteroid shape model (189) Phthia.png
|caption= 3D convex shape model of 189 Phthia
 | discovery_ref   = <ref name="IAU_MPC"/>
 | discoverer      = [C. H. F. Peters](/source/Christian_Heinrich_Friedrich_Peters)
 | discovered      = 9 September 1878
 | discovery_site  = [Clinton, New York](/source/Clinton%2C_Oneida_County%2C_New_York)
 | mpc_name        = (189) Phthia
 | mp_category     = [main-belt](/source/main-belt)
 | alt_names       = A878 RA
 | pronounced      = {{IPAc-en|'|θ|aɪ|.|ə}}<ref>Noah Webster (1884) ''A Practical Dictionary of the English Language''</ref>
 | orbit_ref       = <ref name="JPL"/><ref name="lowell">{{Cite web |url=http://ftp.lowell.edu/pub/elgb/astorb.html |website=astorb |title=The Asteroid Orbital Elements Database |publisher=[Lowell Observatory](/source/Lowell_Observatory) }}</ref>
 | epoch           = 31 July 2016 ([JD](/source/Julian_day) 2457600.5)
 | aphelion        = {{Convert|2.5415|AU|Gm|abbr=on|lk=on}}
 | perihelion      = {{Convert|2.3597|AU|Gm|abbr=on}}
 | semimajor       = {{Convert|2.4506|AU|Gm|abbr=on}}
 | eccentricity    = 0.037105
 | period          = 3.84 [yr](/source/Julian_year_(astronomy)) (1401.2 [d](/source/Julian_year_(astronomy)))
 | inclination     = 5.1774°
 | dimensions      = {{val|37.66|2.0|ul=km}}<ref name="JPL"/><br />40.91 ± 1.36 km<ref name="Carry2012"/>
 | mass            = {{nowrap|(3.84 ± 0.81) × 10<sup>16</sup> kg<ref name="Carry2012"/>}}
 | density         = 1.07 ± 0.25 g/cm<sup>3</sup><ref name="Carry2012"/>
 | spectral_type   = [S](/source/S-type_asteroid)<ref name="Pravec2012"/> ([Tholen](/source/Tholen_classification))
 | albedo          = {{val|0.2310|0.027}}<ref name="JPL"/><br />0.1566 ± 0.0349<ref name="Pravec2012"/>
 | abs_magnitude   = 9.33,<ref name="JPL"/> 9.60<ref name="Pravec2012"/>
 | rotation        = {{Convert|22.346|h|d|abbr=on|lk=on}}<ref name="JPL"/><ref name="Pilcher2009"/>
 | asc_node        = 203.42°
 | arg_peri        = 168.03°
 | mean_anomaly    = 336.98[°](/source/Degree_(angle))
 | mean_motion     = {{Deg2DMS|0.25692|sup=ms}} / day
 | observation_arc = 136.18 yr (49739 d)
 | uncertainty     = 0
}}

'''189 Phthia''' is a bright-coloured, rocky [main belt](/source/Asteroid_belt) [asteroid](/source/asteroid) that was discovered by German-American astronomer [Christian Heinrich Friedrich Peters](/source/Christian_Heinrich_Friedrich_Peters) on September 9, 1878,<ref name="IAU_MPC"/> in [Clinton, New York](/source/Clinton%2C_Oneida_County%2C_New_York), and named after [Phthia](/source/Phthia), a region of [ancient Greece](/source/ancient_Greece).

[Photometric](/source/Photometry_(astronomy)) observations of this asteroid at the Organ Mesa Observatory in [Las Cruces, New Mexico](/source/Las_Cruces%2C_New_Mexico), during 2008 gave a [light curve](/source/light_curve) with a period of 22.346 ± 0.001 hours and a brightness variation of 0.26 ± 0.02 in [magnitude](/source/Magnitude_(astronomy)).<ref name="Pilcher2009"/>

==References==
{{Reflist|refs=

<ref name="IAU_MPC">{{Citation
 | title     = Numbered Minor Planets 1–5000
 | work      = Discovery Circumstances
 | publisher = IAU Minor Planet center
 | url       = https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html
 | accessdate= 2013-04-07
 | postscript= .}}</ref>

<ref name="JPL">{{Citation
 | first1    = Donald K.
 | last1     = Yeomans
 | title     = 189 Phthia
 | work      = JPL Small-Body Database Browser
 | publisher = [NASA Jet Propulsion Laboratory](/source/NASA_Jet_Propulsion_Laboratory)
 | url       = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=189
 | accessdate= 12 May 2016
 | postscript= .}}</ref>

<ref name="Carry2012">{{Citation
 | first1    = B.
 | last1     = Carry
 | title     = Density of asteroids
 | work      = Planetary and Space Science
 | volume    = 73
 | pages      = 98–118
 |date=December 2012
 | doi       = 10.1016/j.pss.2012.03.009
 | bibcode   = 2012P&SS...73...98C
 | postscript= .
 |arxiv = 1203.4336 }} See Table 1.</ref>

<ref name="Pravec2012">{{Citation
 | last1     = Pravec
 | first1    = P.
 | last2     = Harris
 | first2    = A. W.
 | last3     = Kusnirak
 | first3    = P.
 | last4     = Galad
 | first4    = A.
 | last5     = Hornoch
 | first5    = K.
 | display-authors = 1
 | title     = Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations
 | work      = Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan
 | issue     = 1667
 |date=May 2012
 | bibcode   = 2012LPICo1667.6089P
 | postscript= .}} See Table 4.</ref>

<ref name="Pilcher2009">{{Citation
 | last1     = Pilcher
 | first1    = Frederick
 | title     = Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna
 | work      = The Minor Planet Bulletin
 | volume    = 36
 | issue     = 1
 | pages     = 25–27 
 |date=January 2009
 | bibcode   = 2009MPBu...36...25P
 | postscript= .}}</ref>

}} <!-- end of reflist -->

==External links==
* {{AstDys|189}}
* {{JPL small body}}

{{Minor planets navigator |188 Menippe |number=189 |190 Ismene}}
{{Small Solar System bodies}}
{{Authority control}}

{{DEFAULTSORT:000189}}
Category:Background asteroids
Phthia
Phthia
Category:S-type asteroids (Tholen)
Category:Sa-type asteroids (SMASS)
18780909

{{S-beltasteroid-stub}}

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Adapted from the Wikipedia article [189 Phthia](https://en.wikipedia.org/wiki/189_Phthia) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/189_Phthia?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.