| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 13 August 1923 |
| Designations | |
| (1026) Ingrid | |
Named after | Ingrid, niece of astronomer Albrecht Kahrstedt[2] |
| 1923 NY · 1957 UC 1963 GD · 1981 WL8 1986 CG2 · 1986 ES2 | |
| main-belt · (inner) Flora[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.89 yr (34,294 days) |
| Aphelion | 2.6636AU |
| Perihelion | 1.8458 AU |
| 2.2547 AU | |
| Eccentricity | 0.1814 |
| 3.39yr (1,237 days) | |
| 292.55° | |
| 0° 17m 27.96s / day | |
| Inclination | 5.3994° |
| 104.59° | |
| 212.34° | |
| Physical characteristics | |
| Dimensions | 5.73±1.01 km[5] 6.96±0.68 km[6] 7.353±0.082 km[7] 7.670±0.069 km[8] 8.19 km(calculated)[3] |
| 5h[9] | |
| 0.1441±0.0250[8] 0.156±0.024[7] 0.175±0.035[6] 0.24(assumed)[3] 0.43±0.22[5] | |
| S [3] | |
| 12.6[3] · 12.70[5] · 12.8[1] · 13.30[6][8] | |
1026 Ingrid, provisional designation1923 NY, is a stony Florianasteroid and long-lost minor planet (1923–1986) from the inner regions of theasteroid belt, approximately 7 kilometers in diameter. It was discovered byKarl Reinmuth at Heidelberg in 1923, and later named after Ingrid, niece and godchild of astronomerAlbrecht Kahrstedt.[10]
Ingrid was discovered on 13 August 1923, by German astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was observed for only a few days during August 1923, before it became alost minor planet for nearly 63 years until its recovery by Japanese astronomerSyuichi Nakano in 1986.[10][11]
Nakano was able to show thatIngrid had been observed andprovisionally designated several times during its lost period: as1957 UC at the discovering Heidelberg Observatory in October 1957, possibly as1963 GD atGoethe Link Observatory in April 1963, as1981 WL8 at theCrimean Astrophysical Observatory in November 1981, and as1986 ES2 atPalomar Observatory in March 1986.[10][11]
With the recovery ofIngrid in 1986, and the almost simultaneously recovered asteroid1179 Mally, the list of long-lost numbered asteroids was reduced to four.[11] The last remaining lost asteroid,69230 Hermes, was recovered in 2003.
Ingrid is a member of theFlora family (402), a giantasteroid family and the largest family of stony asteroids.[3][4] It orbits the Sun in theinner main-belt at a distance of 1.8–2.7 AU once every 3 years and 5 months (1,237 days). Its orbit has aneccentricity of 0.18 and aninclination of 5° with respect to theecliptic.[1] The body'sobservation arc begins at Heidelberg, one night after its official discovery observation in 1923.[10]
Ingrid is an assumedS-type asteroid, in-line with the Flora family'sspectral type.[3][12]: 23
A rotationallightcurve ofIngrid was obtained from photometric observations by a group of Hungarian astronomers. The 2005-published lightcurve analysis gave arotation period of 5 hours with a brightness variation of 0.5magnitude (U=2).[9]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Ingrid measures between 5.73 and 7.67 kilometers in diameter and its surface has analbedo between 0.1441 and 0.43.[5][6][7][8]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 8.19 kilometers based anabsolute magnitude of 12.6.[3]
Thisminor planet was named after Ingrid, niece and godchild of Albrecht Kahrstedt (1897–1971), a German astronomer atARI and director of the institute's Potsdam division, who requested the naming of this asteroid and984 Gretia (mother of Ingrid) in a personal letter to the discoverer in February 1926.[2] Kahrstedt himself was honored with the naming of1587 Kahrstedt.
The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H98).Lutz Schmadel quoted an excerpt of Kahrstedt's letter in hisDictionary of Minor Planet Names (LDS).[2]
