Discovery | |
---|---|
Discovered by | Paul Götz |
Discovery date | 18 July 1904 |
Designations | |
(538) Friederike | |
Pronunciation | German: [fʁiːdəˈʁiːkə] [1] |
1904 OK | |
Main belt ( Hygiea family) | |
Orbital characteristics [2] | |
Epoch 31 July 2016 ( JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 111.70 yr (40800 d) |
Aphelion | 3.6924 AU (552.38 Gm) |
Perihelion | 2.6238 AU (392.51 Gm) |
3.1581 AU (472.45 Gm) | |
Eccentricity | 0.16919 |
5.61 yr (2049.9 d) | |
275.237 ° | |
0° 10m 32.232s / day | |
Inclination | 6.5204° |
141.173° | |
227.779° | |
Physical characteristics | |
36.245±1.15
km
[2] 36 km [3] | |
Mean
density | ~1.4 g/cm3 [4] |
1.1 d
[5] 46.728 h (1.9470 d) [2] | |
0.0641
[3] 0.0641±0.004 [2] | |
B-type asteroid [6] | |
9.5 | |
538 Friederike is a minor planet (an asteroid specifically) orbiting in the asteroid belt. It is a member of the Hygiea family of asteroids.
Photometric observations at the Organ Mesa Observatory in New Mexico during 2012 showed a rotation period of 46.728 ± 0.004 hours with a brightness variation of 0.25 ± 0.02 in magnitude. [7]