| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 8 January 1937 |
| Designations | |
| (1409) Isko | |
Named after | Ise Koch[2] (wife of astronomer) Fritz Kubach |
| 1937 AK · 1933 FG 1935 SZ1 · 1951 GN A900 UD | |
| main-belt · (middle)[3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 116.70 yr (42,623 days) |
| Aphelion | 2.8258AU |
| Perihelion | 2.5258 AU |
| 2.6758 AU | |
| Eccentricity | 0.0561 |
| 4.38yr (1,599 days) | |
| 250.81° | |
| 0° 13m 30.72s / day | |
| Inclination | 6.7090° |
| 177.56° | |
| 207.79° | |
| Physical characteristics | |
| Dimensions | 34.62±11.47 km[5] 34.66±9.67 km[6] 35.34 km(derived)[3] 35.54±1.7 km[7] 37.23±0.48 km[8] 38.46±8.82 km[9] |
| 11.6426±0.0007h[10] | |
| 0.032±0.016[9] 0.04±0.03[6] 0.05±0.05[5] 0.0514(derived)[3] 0.074±0.002[8] 0.0805±0.008[7] | |
| C[11] · C/S (assumed)[3] | |
| 10.60[7][8] · 10.89±0.29[11] · 11.10[1][3][6] · 11.15[5] · 11.42[9] | |
1409 Isko (provisional designation1937 AK) is a carbonaceous backgroundasteroid from the central regions of theasteroid belt, approximately 35 kilometres (22 mi) in diameter. It was discovered on 8 January 1937, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[12] The asteroid was named after Ise Koch, wife of astronomer Fritz Kubach.[2]
Isko is a non-family asteroid of the main belt'sbackground population.[4] It orbits the Sun in thecentral asteroid belt at a distance of 2.5–2.8 AU once every 4 years and 5 months (1,599 days). Its orbit has aneccentricity of 0.06 and aninclination of 7° with respect to theecliptic.[1]
The body'sobservation arc begins with its first identification asA900 UD at Heidelberg in October 1900, more than 36 years prior to its official discovery observation.[12]
Isko has been characterized as a carbonaceousC-type asteroid byPan-STARRS photometric survey.[11]
In December 2001, a rotationallightcurve of Isko was obtained from photometric observations by French amateur astronomersLaurent Bernasconi andRené Roy. Lightcurve analysis gave arotation period of 11.6426 hours with a brightness amplitude of 0.20magnitude (U=2).[10]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, Isko measures between 34.62 and 38.46 kilometres (21.51 and 23.90 mi) in diameter and its surface has analbedo between 0.032 and 0.0805.[5][6][7][8][9]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0514 and a diameter of 35.34 kilometres (21.96 mi) based on anabsolute magnitude of 11.1.[3]
Thisminor planet was named after Ise Koch, wife of German astronomer Fritz Kubach (1912–1945)(de) The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 127).[2]
