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Phthia (minor planet designation: 189 Phthia) is a bright-coloured, rocky main belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on September 9, 1878[1] in Clinton, New York and named after Phthia, a region of Ancient Greece.

189 Phthia
3D convex shape model of 189 Phthia
Discovery[1]
Discovered byC. H. F. Peters
Discovery siteClinton, New York
Discovery date9 September 1878
Designations
MPC designation
(189) Phthia
Pronunciation/ˈθaɪ.ə/[2]
Minor planet category
main-belt
Orbital characteristics[3][4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc136.18 yr (49739 d)
Aphelion2.5415 AU (380.20 Gm)
Perihelion2.3597 AU (353.01 Gm)
Semi-major axis
2.4506 AU (366.60 Gm)
Eccentricity0.037105
Orbital period (sidereal)
3.84 yr (1401.2 d)
Mean anomaly
336.98°
Mean motion
0° 15m 24.912s / day
Inclination5.1774°
Longitude of ascending node
203.42°
Argument of perihelion
168.03°
Physical characteristics
Dimensions37.66±2.0 km[3]
40.91 ± 1.36 km[5]
Mass(3.84 ± 0.81) × 1016 kg[5]
Mean density
1.07 ± 0.25 g/cm3[5]
Synodic rotation period
22.346 h (0.9311 d)[3][6]
Geometric albedo
0.2310±0.027[3]
0.1566 ± 0.0349[7]
Spectral type
S[7] (Tholen)
Absolute magnitude (H)
9.33,[3] 9.60[7]

    Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2008 gave a light curve with a period of 22.346 ± 0.001 hours and a brightness variation of 0.26 ± 0.02 in magnitude.[6]


    References


    1. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    2. Noah Webster (1884) A Practical Dictionary of the English Language
    3. Yeomans, Donald K., "189 Phthia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    4. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
    5. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    6. Pilcher, Frederick (January 2009), "Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna", The Minor Planet Bulletin, vol. 36, no. 1, pp. 25–27, Bibcode:2009MPBu...36...25P.
    7. Pravec, P.; et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan, no. 1667, Bibcode:2012LPICo1667.6089P. See Table 4.



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    На других языках

    [de] (189) Phthia

    (189) Phthia ist ein Asteroid des Asteroiden-Hauptgürtels, der am 9. September 1878 von Christian Heinrich Friedrich Peters entdeckt wurde. Benannt wurde der Himmelskörper nach Phthia, der Tochter des Phoroneus und Mutter des Achaios aus der griechischen Mythologie.
    - [en] 189 Phthia

    [es] (189) Phthia

    (189) Phthia es un asteroide que forma parte del cinturón de asteroides y fue descubierto el 9 de septiembre de 1878 por Christian Heinrich Friedrich Peters desde el observatorio Litchfield de Clinton, Estados Unidos. El nombre puede haber sido tomado de Ftía, hija de Níobe, o de Ftía, amante de Apolo, ambos personajes de la mitología griega.[2]

    [ru] (189) Фтия

    (189) Фтия (др.-греч. Φθία) — небольшой каменный астероид главного пояса.


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