919 Ilsebill

919 Ilsebill (prov. designation: or ) 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. The carbonaceous C-type asteroid has a short rotation period of 5.0 hours and measures approximately 33 km in diameter. It was named after "Ilsebill", a character in the fairy tale The Fisherman and his Wife by the Brothers Grimm.

Orbit and classification
Ilsebill is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. 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. The body's observation arc begins at Heidelberg Observatory with its official discovery observation on 30 October 1918.

Naming
This minor planet was named after the character "Ilsebill" in the fairy tale The Fisherman and his Wife (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, and subsequently published by ARI (RI 1013). The was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 89).

Physical characteristics
In the Bus–Binzel SMASS classification and in the SDSS-based taxonomy, Ilsebill is a common, carbonaceous C-type asteroid.

Rotation period
In October 2010, a rotational lightcurve of Ilsebill was obtained from photometric observations by Zachary Pligge, Ben Hall and Richard Ditteon at the U.S. Oakley Observatory in Indiana. Lightcurve analysis gave a well-defined rotation period of $27.65 km$ hours with a brightness variation of $33.41 km$ magnitude (U=3). In September 2010, a similar, though lower rated period of $33.5 km$ hours with an amplitude of $5.033 h$ was determined by astronomers at the Palomar Transient Factory in California (U=2).

A modeled lightcurve using photometric data from the Lowell Photometric Database and from the Wide-field Infrared Survey Explorer (WISE) was published in 2018. It gave a concurring sidereal period of $0.047$ hours and includes a partial spin axis at (β1 = −53.0°) in ecliptic coordinates (λ,&thinsp;β).

Diameter and albedo
According to the survey carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's WISE telescope, Ilsebill measures ($0.048$), ($0.07$) and ($5.033$) kilometers in diameter and its surface has a low albedo of ($0.25$), ($5.034$) and ($0.24$), respectively. The Collaborative Asteroid Lightcurve Link derives its estimate from IRAS, that is, an albedo of 0.0638 and a diameter of 27.62 km based on an absolute magnitude of 11.4. Further published mean-diameters by the WISE team include ($5.033$), ($27.65$), ($33.41$), ($33.5$) and ($0.07$) with albedos between ($0.048$) and ($0.047$).