201 Penelope

201 Penelope
	A One-dimensional model of 201 Penelope based on its light curve.
Discovery
Discovered by	Johann Palisa
Discovery date	7 August 1879
Designations
MPC designation	(201) Penelope
Pronunciation	/pɪˈnɛləpiː/[1]
Named after	Penelópē
Alternative designations	A869 GA
Minor planet category	Main belt
Adjectives	Penelopean /pɪˈnɛloʊˈpiːən/[1]
Orbital characteristics[2]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	136.51 yr (49860 d)
Aphelion	3.16233 AU (473.078 Gm)
Perihelion	2.19242 AU (327.981 Gm)
Semi-major axis	2.67737 AU (400.529 Gm)
Eccentricity	0.18113
Orbital period	4.38 yr (1600.2 d)
Average orbital speed	18.19 km/s
Mean anomaly	79.3202°
Mean motion	0° 13m 29.921s / day
Inclination	5.75820°
Longitude of ascending node	157.026°
Argument of perihelion	180.859°
Physical characteristics
Dimensions	68.39±3.5 km[2]; 87.72 km[3]
Rotation period	3.7474 h (0.15614 d)
Geometric albedo	0.1604±0.018[2]; 0.0881 ± 0.0187[3]
Spectral type	M[3] (Tholen)
Absolute magnitude (H)	8.43,[2] 8.54[3]

Penelope (minor planet designation: 201 Penelope) is a large main belt asteroid that was discovered by Austrian astronomer Johann Palisa on August 7, 1879, in Pola. The asteroid is named after Penelope, the wife of Odysseus in Homer's The Odyssey.

Based upon the spectra of this object, it is classified as a M-type asteroid, indicating it may be metallic in composition.[3] It may be the remnant of the core of a larger, differentiated asteroid. Near infrared absorption features indicate the presence of variable amounts of low-iron, low-calcium orthopyroxenes on the surface. Trace amounts of water is detected with a mass fraction of about 0.13–0.15 wt%.[4] It has an estimated size of around 88 km.[3] With a rotation period of 3.74 hours, it is the fastest rotating asteroid larger than 50 km in diameter.[2]

References

"Penelope". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
"JPL Small-Body Database Search Engine: diameter > 50 (km) and rot_per > 0 (h)". JPL Solar System Dynamics. Retrieved 12 May 2016.
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.
Hardersen, Paul S.; Gaffey, Michael J.; Abell, Paul A. (January 1983), "Near-IR spectral evidence for the presence of iron-poor orthopyroxenes on the surfaces of six M-type asteroids", Icarus, 175 (1), pp. 141–158, Bibcode:2005Icar..175..141H, doi:10.1016/j.icarus.2004.10.017.

External links

The Asteroid Orbital Elements Database
Asteroid Lightcurve Parameters
Asteroid Albedo Compilation
201 Penelope at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
201 Penelope at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[OED-1] "Penelope". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[SBDB-2] "JPL Small-Body Database Search Engine: diameter > 50 (km) and rot_per > 0 (h)". JPL Solar System Dynamics. Retrieved 12 May 2016.

[Pravec2012-3] 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.

[Hardersen1983-4] Hardersen, Paul S.; Gaffey, Michael J.; Abell, Paul A. (January 1983), "Near-IR spectral evidence for the presence of iron-poor orthopyroxenes on the surfaces of six M-type asteroids", Icarus, 175 (1), pp. 141–158, Bibcode:2005Icar..175..141H, doi:10.1016/j.icarus.2004.10.017.