357 Ninina

357 Ninina is a large main-belt asteroid.^[1] It was discovered by Auguste Charlois on February 11, 1893, in Nice. The reference of its name is not known, though Ninine is a French personal name.^[3] This minor planet is orbiting at a distance of 3.16 AU from the Sun with a period of 5.61 years and an orbital eccentricity (ovalness) of 0.074. The orbital plane is inclined at an angle of 15.1° to the plane of the ecliptic.^[1]

357 Ninina

Lightcurve-base 3D-model of 357 Ninina.
Discovery
Discovered by	Auguste Charlois
Discovery date	11 February 1893
Designations
MPC designation	(357) Ninina
Alternative designations	1893 J
Minor planet category	Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	108.56 yr (39650 d)
Aphelion	3.38973 AU (507.096 Gm)
Perihelion	2.92272 AU (437.233 Gm)
Semi-major axis	3.15623 AU (472.165 Gm)
Eccentricity	0.073982
Orbital period (sidereal)	5.61 yr (2,048.1 d)
Mean anomaly	144.322°
Mean motion	0° 10m 32.783s / day
Inclination	15.0642°
Longitude of ascending node	137.809°
Argument of perihelion	254.250°
Physical characteristics
Dimensions	97+7 −8 km[2]
Synodic rotation period	36.0105 h (1.50044 d)
Geometric albedo	0.0510±0.002
Absolute magnitude (H)	8.72

Photometric observations of 357 Ninina during 2023 provided a light curve that presents an Earth commensurate rotation period of 36.00±0.01 h with a brightness amplitude of 0.08±0.01 in magnitude.^[4] In 2024, spin shape modelling using the light curve inversion technique show a blocky, rounded figure, with a refined rotation period of 35.9840±0.0005 h^[5]