189 Phthia

189 Phthia
Discovery[1]
Discovered by	C. H. F. Peters
Discovery site	Clinton, New York
Discovery date	9 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 arc	136.18 yr (49739 d)
Aphelion	2.5415 AU (380.20 Gm)
Perihelion	2.3597 AU (353.01 Gm)
Semi-major axis	2.4506 AU (366.60 Gm)
Eccentricity	0.037105
Orbital period	3.84 yr (1401.2 d)
Mean anomaly	336.98°
Mean motion	0° 15m 24.912s / day
Inclination	5.1774°
Longitude of ascending node	203.42°
Argument of perihelion	168.03°
Physical characteristics
Dimensions	37.66±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]
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]

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.

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

"Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
Noah Webster (1884) A Practical Dictionary of the English Language
Yeomans, Donald K., "189 Phthia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
"The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
Pilcher, Frederick (January 2009), "Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna", The Minor Planet Bulletin, 36 (1), pp. 25–27, Bibcode:2009MPBu...36...25P.
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.

External links

189 Phthia at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
189 Phthia at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[IAU_MPC-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

[JPL-3] Yeomans, Donald K., "189 Phthia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.

[lowell-4] "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.

[Carry2012-5] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[Pilcher2009-6] Pilcher, Frederick (January 2009), "Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna", The Minor Planet Bulletin, 36 (1), pp. 25–27, Bibcode:2009MPBu...36...25P.

[Pravec2012-7] 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 (1667), Bibcode:2012LPICo1667.6089P. See Table 4.