10415 Mali Lošinj

10415 Mali Lošinj (provisional designation 1998 UT₁₅) is a dark background asteroid and very slow rotator from the outer region of the asteroid belt, approximately 16 kilometers in diameter. It was discovered by Croatian astronomer Korado Korlević at Višnjan Observatory, Croatia, on 23 October 1998.^[9] The asteroid was named after the Croatian town of Mali Lošinj.

10415 Mali Lošinj

Discovery[1]
Discovered by	K. Korlević
Discovery site	Višnjan Obs.
Discovery date	23 October 1998
Designations
MPC designation	(10415) Mali Lošinj
Named after	Mali Lošinj (Croatian island)[2]
Alternative designations	1998 UT15 · 1925 VM 1962 WE1 · 1977 TN3 1987 SW20 · 1988 VW7
Minor planet category	main-belt · (outer)[3] background
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	54.52 yr (19,915 days)
Aphelion	3.0650 AU
Perihelion	2.9115 AU
Semi-major axis	2.9883 AU
Eccentricity	0.0257
Orbital period (sidereal)	5.17 yr (1,887 days)
Mean anomaly	121.02°
Mean motion	0° 11m 26.88s / day
Inclination	14.427°
Longitude of ascending node	221.70°
Argument of perihelion	298.55°
Physical characteristics
Dimensions	13.514±0.135[4] 14.912±0.112 km[5] 16.20±0.70 km[6] 18.77 km (calculated)[3]
Synodic rotation period	240.5115±20.6153 h[7]
Geometric albedo	0.057 (assumed)[3] 0.128±0.019[6][4] 0.1521±0.0344[5]
Spectral type	C[3] · X[8]
Absolute magnitude (H)	11.54±0.44[8] · 11.8[5][6] · 11.9[1] · 11.911±0.002 (R)[7] · 12.36[3]

Orbit and classification

Mali Lošinj orbits the Sun in the outer main-belt at a distance of 2.9–3.1 AU once every 5 years and 2 months (1,887 days). Its orbit has an eccentricity of 0.03 and an inclination of 14° with respect to the ecliptic.^[1] The first used precovery was obtained at Goethe Link Observatory in 1962, extending the asteroid's observation arc by 36 years prior to its discovery. The first unused observations were made at Heidelberg Observatory in 1925.^[9]

Physical characteristics

Mali Lošinj has also been characterized as an X-type asteroid by Pan-STARRS photometric survey.^[3][8]

Slow rotators

In September 2013, photometric observations at the Palomar Transient Factory in California gave a rotational lightcurve that showed a period of 240.5115 hours with a brightness amplitude of 0.48 in magnitude (U=2).^[7] Mali Lošinj is a slow rotator, as asteroids of this size usually rotate within hours once around its axis.

Diameter and albedo

According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, Mali Lošinj measures between 13.5 and 16.2 kilometers in diameter and its surface has an albedo between 0.13 and 0.15.^[4][5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a somewhat larger diameter of 18.8 kilometers with an absolute magnitude of 12.36.^[3]

Naming

This minor planet was named after the Croatian town of Mali Lošinj, located on the island of Lošinj, in the northern Adriatic Sea. The island and the town are well known for its nautical school and the Leo Brener Observatory.^[2] The minor planet 10645 Brač is also named after a Croatian island in the Adriatic Sea. The approved naming citation was published by the Minor Planet Center on 15 December 2005 (M.P.C. 55720).^[10]