878 Mildred
| Discovery [1][2] | |
|---|---|
| Discovered by | S. B. Nicholson H. Shapley |
| Discovery site | Mount Wilson |
| Discovery date | 6 September 1916 |
| Designations | |
| MPC designation | 878 |
| 1916 f, 1985 VG6, 1991 GZ8 | |
| Nysa family [3] Main belt  |
|
| Orbital characteristics [1] | |
| Epoch 9 December 2014 (JD 2457000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 98.59 yr |
| Aphelion | 2.8931 AU |
| Perihelion | 1.8281 AU |
| 2.3606 AU | |
| Eccentricity | 0.2255 |
| 3.63 yr (1,324.7 d) | |
| 36.400° | |
| Inclination | 2.0609° |
| 172.86° | |
| 189.75° | |
| Physical characteristics | |
| Dimensions | ~4 km[4] |
| 2.660 h[1] | |
|
Spectral type
|
S[3] |
| 14.7[1] | |
878 Mildred is a minor planet in the main belt orbiting the Sun. It is the lowest numbered, and thus the namesake, of the Mildred family of asteroids, a subgroup of the Nysa family.[3] The Mildred subgroup, and by extension 878 Mildred itself, is thought to have been formed by a recent fragmentation event from a larger asteroid.[3]
Discovery
878 Mildred was originally discovered in 1916 using the 1.5 m Hale Telescope at the Mount Wilson Observatory, but was subsequently lost until it was again observed on single nights in 1985 and 1991 (a lost asteroid).[2] Initially only two observations of the asteroid were taken on 1916-09-06 which does not allow for an accurate orbital determination, however interest in the object prompted further investigation and more measurements were taken in late September and October.[4] The asteroid was re-discovered in 1991 by Gareth V. Williams.[5]
Physical properties
By comparing the asteroid's perceived brightness and the then computed distance from the Sun they arrived at an absolute visual magnitude of 14.3, which if one assumes Mars-like albedo gives an approximate diameter of 3 to 5 kilometers.[4]
References
- ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
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