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289 Nenetta

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289 Nenetta
Discovery
Orbital diagram
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° 12^m 8.316^s / 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

Nenetta (minor planet designation: 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]

Photometric observations taken in 2018 provided a light curve showing a synodic rotation periodof6.916±0.001 h for the asteroid with an amplitudeof0.20±0.02inmagnitude. 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]

References

[edit]

^ ^a ^b "289 Nenetta". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.

^ Schmadel, Lutz (5 August 2003), Dictionary of minor planet names, Springer, p. 40, ISBN 9783540002383.

^ Pilcher, Frederick (October 2018), "New Lightcurves of 33 Polyhymnia, 49 Pales, 289 Nenetta 504 Cora, and 821 Fanny", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, 45 (4): 356–359, Bibcode:2018MPBu...45..356P.