878 Mildred
| Discovery[1][2] | |
|---|---|
| Discovered by | S. B. Nicholson H. Shapley |
| Discovery site | Mount Wilson Obs. |
| Discovery date | 6 September 1916 |
| Designations | |
| (878) Mildred | |
Named after | Mildred Shapley Matthews |
| 1916 f, 1985 VG6, 1991 GZ8 | |
| main-belt Nysa[3] | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 99.57 yr (36368 days) |
| Aphelion | 2.8953 AU (433.13 Gm) |
| Perihelion | 1.8286 AU (273.55 Gm) |
| 2.3619 AU (353.34 Gm) | |
| Eccentricity | 0.22580 |
| 3.63 yr (1325.9 d) | |
| 198.89° | |
| 0° 16m 17.472s / day | |
| Inclination | 2.0648° |
| 172.83° | |
| 190.14° | |
| Physical characteristics | |
| Dimensions | ~4 km[4] |
| 2.660 h (0.1108 d)[1] | |
| 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
[edit | edit source]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] It is named after Mildred Shapley Matthews.
Physical properties
[edit | edit source]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
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External links
[edit | edit source]- Minor Planet Center Database entry on (878) Mildred
- 878 Mildred at AstDyS-2, Asteroids—Dynamic Site
- 878 Mildred at the JPL Small-Body DatabaseLua error in Module:EditAtWikidata at line 29: attempt to index field 'wikibase' (a nil value).
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