6793 Palazzolo

6793 Palazzolo, provisional designation 1991 YE, is a stony asteroid from the middle region of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 30 December 1991, by Italian amateur astronomers Ulisse Quadri and Luca Strabla at the Bassano Bresciano Observatory in northern Italy.^[9] The asteroid was named after the Italian city of Palazzolo sull'Oglio.^[2]

6793 Palazzolo

Discovery[1]
Discovered by	U. Quadri L. Strabla
Discovery site	Bassano Bresciano Obs.
Discovery date	30 December 1991
Designations
MPC designation	(6793) Palazzolo
Named after	Palazzolo sull'Oglio (Italian city)[2]
Alternative designations	1991 YE · 1982 YS2 1990 SZ23
Minor planet category	main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	33.90 yr (12,382 days)
Aphelion	3.1007 AU
Perihelion	2.2594 AU
Semi-major axis	2.6800 AU
Eccentricity	0.1569
Orbital period (sidereal)	4.39 yr (1,603 days)
Mean anomaly	273.56°
Mean motion	0° 13m 28.56s / day
Inclination	4.9244°
Longitude of ascending node	106.38°
Argument of perihelion	46.196°
Physical characteristics
Dimensions	8.01 km (calculated)[3] 9.882±0.051 km[4][5]
Synodic rotation period	6.190±0.040 h[6] 6.2308±0.0072 h[3][7] 6.2323±0.0072 h[7]
Geometric albedo	0.083±0.004[4][5] 0.10 (assumed)[3]
Spectral type	S[3]
Absolute magnitude (H)	13.6[1] · 13.78±0.23[8] · 13.520±0.110[6] · 13.3[4] · 14.143±0.005 (S)[7] · 13.709±0.002 (R)[7]

Orbit and classification

Palazzolo orbits the Sun in the central main-belt at a distance of 2.3–3.1 AU once every 4 years and 5 months (1,603 days). Its orbit has an eccentricity of 0.16 and an inclination of 5° with respect to the ecliptic.^[1]

In 1982, the asteroid was first identified as 1982 YS₂ at Crimea–Nauchnij. Its observation arc begins 1990, with its identification as 1990 SZ₂₃ at ESO's La Silla Observatory, 1 year prior to its official discovery observation at Bassano Bresciano.^[9]

Physical characteristics

Palazzolo is an assumed S-type asteroid.^[3]

Rotation period

In 2012, a rotational lightcurve of Palazzolo was obtained from photometric observations at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 6.2308 hours with a brightness amplitude of 0.16 in magnitude (U=2).^[7]

Follow-up observations in 2013 and 2014, gave a similar period of 6.190 and 6.2323 hours with an amplitude of 0.16 and 0.14, respectively (U=2/2).^[7][6]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Palazzolo has a diameter of 9.9 kilometers and an albedo of 0.083,^[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 and calculates a diameter of 8.0 kilometers.^[3]

Naming

This minor planet is named after the Italian city of Palazzolo sull'Oglio, located between Brescia and Bergamo, in northern parts of the country. Known for its industries, including the first Italian factories producing cement and buttons, the city is now famous for its of spinning machines and zippers. It was founded on the banks of river Oglio, with archaeological findings dating back to the Roman era.^[2] The approved naming citation was published by the Minor Planet Center on 4 April 1996 (M.P.C. 26933).^[10]