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]
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]
In the Bus–Binzel SMASS classification and in the SDSS-based taxonomy, Ilsebill is a common, carbonaceous C-type asteroid. [3] [5] [10]
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 ( 916) in Indiana. Lightcurve analysis gave a well-defined rotation period of 5.0325±0.0011 hours with a brightness variation of 0.25±0.02 magnitude ( U=3). [9] In September 2010, a similar, though lower rated period of 5.034±0.0010 hours with an amplitude of 0.24 was determined by astronomers at the Palomar Transient Factory in California ( U=2). [11] [12]
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 5.03348±0.00002 hours and includes a partial spin axis at (β1 = −53.0°) in ecliptic coordinates (λ, β). [13]
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 (27.65±1.7), (33.41±0.49) and (33.500±0.071) kilometers in diameter and its surface has a low albedo of (0.0698±0.010), (0.048±0.002) and (0.047±0.010), respectively. [6] [7] [8] 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. [11] Further published mean-diameters by the WISE team include (29.37±9.40 km), (32.598±7.912 km), (33.17±0.16 km), (34.444±0.254 km) and (38.64±12.97 km) with albedos between (0.027±0.046) and (0.05±0.03). [5] [11]
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]
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]
In the Bus–Binzel SMASS classification and in the SDSS-based taxonomy, Ilsebill is a common, carbonaceous C-type asteroid. [3] [5] [10]
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 ( 916) in Indiana. Lightcurve analysis gave a well-defined rotation period of 5.0325±0.0011 hours with a brightness variation of 0.25±0.02 magnitude ( U=3). [9] In September 2010, a similar, though lower rated period of 5.034±0.0010 hours with an amplitude of 0.24 was determined by astronomers at the Palomar Transient Factory in California ( U=2). [11] [12]
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 5.03348±0.00002 hours and includes a partial spin axis at (β1 = −53.0°) in ecliptic coordinates (λ, β). [13]
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 (27.65±1.7), (33.41±0.49) and (33.500±0.071) kilometers in diameter and its surface has a low albedo of (0.0698±0.010), (0.048±0.002) and (0.047±0.010), respectively. [6] [7] [8] 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. [11] Further published mean-diameters by the WISE team include (29.37±9.40 km), (32.598±7.912 km), (33.17±0.16 km), (34.444±0.254 km) and (38.64±12.97 km) with albedos between (0.027±0.046) and (0.05±0.03). [5] [11]