Phyllis (minor planet designation: 556 Phyllis) is a minor planet orbiting the Sun. It is an S-type asteroid with a diameter of 38 km and a geometric albedo of 0.185. Based on photometric observations between 1998 and 2006, it has a synodic rotation period of 4.293 ± 0.001 hours.[2] The asteroid is named after Phyllis, a character in Greek mythology.
![]() A three-dimensional model of 556 Phyllis based on its light curve | |
Discovery | |
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Discovered by | Paul Götz |
Discovery site | Heidelberg |
Discovery date | 8 January 1905 |
Designations | |
MPC designation | (556) Phyllis |
Pronunciation | /ˈfɪlɪs/ |
Alternative designations | 1905 PW |
Orbital characteristics[1] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 108.29 yr (39553 d) |
Aphelion | 2.7179 AU (406.59 Gm) |
Perihelion | 2.2115 AU (330.84 Gm) |
Semi-major axis | 2.4647 AU (368.71 Gm) |
Eccentricity | 0.10273 |
Orbital period (sidereal) | 3.87 yr (1413.4 d) |
Mean anomaly | 301.06° |
Mean motion | 0° 15m 16.956s / day |
Inclination | 5.2400° |
Longitude of ascending node | 286.126° |
Argument of perihelion | 177.439° |
Physical characteristics | |
Mean radius | 18.905±0.55 km |
Synodic rotation period | 4.293 h (0.1789 d) |
Geometric albedo | 0.1853±0.011 |
Absolute magnitude (H) | 9.56 |
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