| Discovery[1] | |
|---|---|
| Discovered by | P. Shajn |
| Discovery site | Simeiz Obs. |
| Discovery date | 15 August 1928 |
| Designations | |
| (1113) Katja | |
Named after | Ekaterina Iosko[2] (assistant at Simeiz Observatory) |
| 1928 QC · A909 DH | |
| main-belt · (outer)[3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 108.74 yr (39,719 days) |
| Aphelion | 3.5537AU |
| Perihelion | 2.6687 AU |
| 3.1112 AU | |
| Eccentricity | 0.1422 |
| 5.49yr (2,004 days) | |
| 341.95° | |
| 0° 10m 46.56s / day | |
| Inclination | 13.280° |
| 324.54° | |
| 119.15° | |
| Physical characteristics | |
| Dimensions | 38.20±0.58 km[5] 38.50±2.0 km[6] 38.65 km(derived)[3] 44.792±0.626 km[7] 51.949±1.531 km[8] |
| 18±1h[9] 18.42±0.02 h[9] 18.465±0.010 h[10] 18.47±0.05 h[9] | |
| 0.1144±0.0266[8] 0.168±0.026[7] 0.195±0.018[11] 0.2071±0.023[6] 0.211±0.008[5] 0.2253(derived)[3] | |
| C (assumed)[3] | |
| 9.30[1][3][7] · 9.40[5][6][8] · 9.49±0.20[12] | |
1113 Katja (provisional designation1928 QC) is a backgroundasteroid from the outer regions of theasteroid belt, approximately 39 kilometers in diameter. It was discovered byPelageya Shajn at theSimeiz Observatory in 1928, and named after Ekaterina Iosko, a staff member at the discovering observatory.[2][13]
Katja was discovered on 15 August 1928, by Soviet astronomerPelageya Shajn at theSimeiz Observatory on the Crimean peninsula.[13] Nine nights later, it was independently discovered byMax Wolf at the GermanHeidelberg Observatory on 24 August 1928. TheMinor Planet Center only recognizes the first discoverer.[2] The asteroid was first observed asA909 DH at Heidelberg in February 1909.[13]
Katja is a non-family asteroid of the main belt'sbackground population.[4] It orbits the Sun in theouter asteroid belt at a distance of 2.7–3.6 AU once every 5 years and 6 months (2,004 days;semi-major axis of 3.11 AU). Its orbit has aneccentricity of 0.14 and aninclination of 13° with respect to theecliptic.[1] The body'sobservation arc begins at Heidelberg, 10 days after its official discovery observation at Simeiz.[13]
AlthoughKatja is an assumed, carbonaceousC-type asteroid, it is rather of stony composition due to its high albedo.[3]
Between 2002 and 2011, several rotationallightcurves of Katja were obtained from photometric observations by French amateur astronomers Maurice Audejean,René Roy and Laurent Brunetto (U=2/2/2-).[9] Best rated lightcurve, however, was obtained at theSunflower (739), Blackberry (929) and Universidad de Monterrey (720) observatories in January 2002. Lightcurve analysis gave a well-defined synodicrotation period of 18.465 hours with a brightness amplitude of 0.17magnitude (U=3).[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, Katja measures between 38.20 and 51.949 kilometers in diameter and its surface has analbedo between 0.1144 and 0.211.[5][6][7][8][11]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.2253 and a diameter of 38.65 kilometers based on anabsolute magnitude of 9.3.[3]
Thisminor planet was named for Ekaterina ("Katja") Iosko, a laboratory assistant and orbit calculator at the discoveringSimeiz Observatory (AN 238, 149). She was the daughter of Iosif Gavrilovich Iosko, who also worked as a mechanician at the observatory.[2]
