189 Phthia

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
(189) Phthia
Pronunciation/ˈθ.ə/[2]
A878 RA
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)
2.4506 AU (366.60 Gm)
Eccentricity0.037105
3.84 yr (1401.2 d)
336.98°
0° 15m 24.912s / day
Inclination5.1774°
203.42°
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]
22.346 h (0.9311 d)[3][6]
0.2310±0.027[3]
0.1566 ± 0.0349[7]
S[7] (Tholen)
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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