289 Nenetta

289 Nenetta is an A-type asteroid with a diameter of 38 km. It was discovered by Auguste Charlois on 10 March 1890 in Nice, France.^[2] The asteroid is orbiting the Sun at a distance of 2.87 AU with an eccentricity (ovalness) of 0.204 and an orbital period of 4.87 yr. The orbital plane is inclined at an angle of 6.7° to the plane of the ecliptic.^[1]

289 Nenetta

Orbital diagram
Discovery
Discovered by	Auguste Charlois
Discovery date	10 March 1890
Designations
MPC designation	(289) Nenetta
Minor planet category	Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	113.69 yr (41526 d)
Aphelion	3.46101 AU (517.760 Gm)
Perihelion	2.28661 AU (342.072 Gm)
Semi-major axis	2.87381 AU (429.916 Gm)
Eccentricity	0.20433
Orbital period (sidereal)	4.87 yr (1,779.4 d)
Mean anomaly	104.307°
Mean motion	0° 12m 8.316s / day
Inclination	6.69535°
Longitude of ascending node	182.114°
Argument of perihelion	189.219°
Physical characteristics
Dimensions	37.586±1.002 km
Synodic rotation period	6.902 h (0.2876 d)
Geometric albedo	0.2438±0.042
Absolute magnitude (H)	9.51

Photometric observations taken in 2018 provided a light curve showing a synodic rotation period of 6.916±0.001 h for the asteroid with an amplitude of 0.20±0.02 in magnitude. This result is mostly consistent with previous measurements.^[3]

The spectrum of 289 Nenetta reveals the strong presence of the mineral olivine, a relative rarity in the asteroid belt.^[4]