154 Bertha
| Discovery[1] | |
|---|---|
| Discovered by | P. M. Henry |
| Discovery date | 1875 |
| Designations | |
| Main belt | |
| Orbital characteristics[1][2] | |
| Epoch August 27, 2011 (JD 2455800.5) | |
| Aphelion | 516.929 Gm (3.455 AU) |
| Perihelion | 439.707 Gm (2.939 AU) |
| 478.318 Gm (3.197 AU) | |
| Eccentricity | 0.081 |
| 2088.265 d (5.72 a) | |
|
Average orbital speed
|
16.63 km/s |
| 178.804° | |
| Inclination | 21.043° |
| 36.893° | |
| 155.936° | |
| Physical characteristics | |
| Dimensions | 186.85 ± 1.83[2] km |
| Mass | (9.19 ± 5.20) × 1018[2] kg |
|
Mean density
|
2.69 ± 1.52[2] g/cm3 |
|
Equatorial surface gravity
|
0.0517 m/s² |
|
Equatorial escape velocity
|
0.0978 km/s |
| 25.224[3] h | |
| 0.0483 ± 0.0107[4] | |
| Temperature | ~156 K |
| C[4] | |
| 7.530[4] | |
154 Bertha is a main-belt asteroid. It was discovered by the French brothers Paul Henry and Prosper Henry on November 4, 1875, but the credit for the discovery was given to Prosper. It is probably named after Berthe Martin-Flammarion, sister of the astronomer Camille Flammarion.[5]
Observations performed at the Palmer Divide Observatory in Colorado Springs, Colorado in during 2007 produced a light curve with a period of 22.30 ± 0.03 hours and a brightness range of 0.10 ± 0.02 in magnitude. A 1998 measurement gave a value of 27.6 hours, which doesn't fit the PDO data.[6] In 2011, observations from the Organ Mesa Observatory in Las Cruces, New Mexico were used to determine a rotation period of 25.224 ± 0.002 hours with a brightness variability of 0.10 ± 0.01 magnitude, ruling out previous studies.[3]
This is classified as a C-type asteroid[4] and it has an estimated diameter of about 187 km.[2]
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found. See Table 1.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found. See Table 4.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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