Discovery
Discovery date28 August 1891
Designations
MPC designation(312) Pierretta
Pronunciation/piəˈrɛtə/
Alternative designationsA891 QA
Minor planet categoryMain belt Orbital characteristics
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc128.66 yr (46994 d)
Aphelion3.227 AU (482.8 Gm) Perihelion2.338 AU (349.8 Gm)
Semi-major axis2.782 AU (416.2 Gm)
Eccentricity0.15982
Orbital period (sidereal)4.64 yr (1695.1 d) Mean motion0° 12m 44.554s / day
Inclination9.029344°
Longitude of ascending node6.25477°
Argument of perihelion262.764°
Physical characteristics
Synodic rotation period10.282 h (0.4284 d) Geometric albedo0.1967±0.013
Spectral typeS/Sk
Absolute magnitude (H)8.89