919 Ilsebill
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| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 30 October 1918 |
| Designations | |
| (919) Ilsebill | |
Named after | Fairy tale character "Ilsebill" (The Fisherman and his Wife)[2] |
| A918 UD · 1935 JG 1950 RP · 1950 SE 1950 TN · 1972 MA 1918 EQ | |
| main-belt[1][3] · (middle) background[4][5] | |
| Orbital characteristics[3] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 101.19 yr (36,960 d) |
| Aphelion | 3.0033 AU |
| Perihelion | 2.5408 AU |
| 2.7721 AU | |
| Eccentricity | 0.0834 |
| 4.62 yr (1,686 d) | |
| 14.861° | |
| 0° 12m 48.96s / day | |
| Inclination | 8.1657° |
| 229.83° | |
| 156.02° | |
| Physical characteristics | |
| 5.0325±0.0011 h[9] | |
| 11.4[1][3] | |
919 Ilsebill (prov. designation: A918 UD or 1918 EQ) is a dark background asteroid from the central region of the asteroid belt. It was discovered on 30 October 1918, by astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The carbonaceous C-type asteroid has a short rotation period of 5.0 hours and measures approximately 33 kilometers (21 miles) in diameter. It was named after "Ilsebill", a character in the fairy tale The Fisherman and his Wife by the Brothers Grimm.[2]
Ilsebill is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the central asteroid belt at a distance of 2.5–3.0 AU once every 4 years and 7 months (1,686 days; semi-major axis of 2.77 AU). Its orbit has an eccentricity of 0.08 and an inclination of 8° with respect to the ecliptic.[3] The body's observation arc begins at Heidelberg Observatory with its official discovery observation on 30 October 1918.[1]
Naming
This minor planet was named after the character "Ilsebill" in the fairy tale The Fisherman and his Wife (German: Von dem Fischer und seiner Frau) by the Brothers Grimm. The asteroid was named likely after the discoverer's death in 1932, upon a proposal made by his widow Gisela Wolf, and subsequently published by ARI (RI 1013). The naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 89).[2]
