137 Meliboea
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 21 April 1874 |
| Designations | |
| 1958 UE, 1962 GB, A923 FA | |
| Main belt, meliboea family | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 131.00 yr (47848 d) |
| Aphelion | 3.7946 AU (567.66 Gm) |
| Perihelion | 2.45345 AU (367.031 Gm) |
| 3.12402 AU (467.347 Gm) | |
| Eccentricity | 0.21465 |
| 5.52 yr (2016.8 d) | |
|
Average orbital speed
|
16.66 km/s |
| 221.115° | |
| 0° 10m 42.593s / day | |
| Inclination | 13.419° |
| 202.261° | |
| 107.116° | |
| Earth MOID | 1.48053 AU (221.484 Gm) |
| Jupiter MOID | 1.79839 AU (269.035 Gm) |
| Jupiter Tisserand parameter | 3.138 |
| Physical characteristics | |
| Dimensions |
145.42±3.3 km 145.92 ± 3.58 km |
| Mass | (7.27 ± 3.07) × 1018 kg |
|
Mean density
|
4.46 ± 1.91 g/cm3 |
|
Equatorial surface gravity
|
0.0406 m/s² |
|
Equatorial escape velocity
|
0.0769 km/s |
| 25.676 h (1.0698 d) | |
|
0.0503±0.002 0.0492 ± 0.0128 |
|
| Temperature | ~158 K |
| C (Tholen) | |
| 8.05, 8.10 | |
137 Meliboea is a large, dark main-belt asteroid that was discovered by Austrian astronomer J. Palisa on April 21, 1874, the second of his many asteroid discoveries, and named after one of the three Meliboeas in Greek mythology. The largest body in the Meliboea family of asteroids that share similar orbital elements, only 791 Ani approaches its size. It is classified as a C-type asteroid and may be composed of carbonaceous materials.
Photometric observations of this asteroid made at the Torino Observatory in Italy during 1990–1991 were used to determine a synodic rotation period of 15.28 ± 0.02 hours. A 2009 study at the Organ Mesa Observatory in Las Cruces, New Mexico found a period of 25.676 ± 0.001 hours and a brightness variation of 0.16 ± 0.02 in magnitude. They ruled out a period of 15 hours determined in previous studies.
During 2002, 137 Meliboea was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 144 ± 16 km. This is consistent with the asteroid dimensions computed through other means.
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