189 Phthia

189 Phthia
Discovery[1]
Discovered by C. H. F. Peters
Discovery site Clinton, New York
Discovery date September 9, 1878
Orbital characteristics[2][3]
Aphelion 2.541 AU
Perihelion 2.360 AU
2.450 AU
Eccentricity 0.037
3.84 years
Inclination 5.18°
Physical characteristics
Dimensions 40.91 ± 1.36[4] km
Mass (3.84 ± 0.81) × 1016[4] kg
Mean density
 1.07 ± 0.25[4] g/cm3
22.346[5] h
Albedo 0.1566 ± 0.0349[6]
Spectral type
 S[6] (Tholen)
9.60[6]

    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.

    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.[5]

    References

    1. ↑ 1.0 1.1 "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
    2. ↑ Yeomans, Donald K., "189 Phthia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-04-07.
    3. ↑ The Asteroid Orbital Elements Database
    4. ↑ 4.0 4.1 4.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    5. ↑ 5.0 5.1 Pilcher, Frederick (January 2009), "Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 36 (1): 25–27, Bibcode:2009MPBu...36...25P.
    6. ↑ 6.0 6.1 6.2 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 (1667), Bibcode:2012LPICo1667.6089P. See Table 4.