| Discovery[1] | |
|---|---|
| Discovered by | L. Volta |
| Discovery site | Pino Torinese Obs. |
| Discovery date | 4 February 1932 |
| Designations | |
| (1238) Predappia | |
Named after | Predappio[2](Italian town) |
| 1932 CA · 1954 EQ 1961 XU | |
| main-belt · (middle) Eunomia[3] · Adeona[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 80.42 yr (29,372 days) |
| Aphelion | 3.0430AU |
| Perihelion | 2.2905 AU |
| 2.6667 AU | |
| Eccentricity | 0.1411 |
| 4.35yr (1,591 days) | |
| 225.94° | |
| 0° 13m 34.68s / day | |
| Inclination | 12.155° |
| 51.944° | |
| 91.913° | |
| Physical characteristics | |
| Dimensions | 19.91 km(derived)[3] 19.96±1.0 km[5] 20.606±0.058 km[6] 21.204±0.206 km[7] 21.70±6.92 km[8] 27.09±1.02 km[9] 32.14±6.44 km[10] |
| 6.13±0.04h(poor)[11] 8.94±0.02 h[12][a] 24 h(poor)[13] | |
| 0.02±0.02[10] 0.042±0.004[9] 0.0447±0.0040[7] 0.05±0.05[8] 0.0644(derived)[3] 0.070±0.007[6] 0.0771±0.008[5] | |
| S(assumed)[3] | |
| 11.90[5][7][9] · 12.10[1][3][8][10] · 12.12±0.18[14] | |
1238 Predappia, provisional designation1932 CA, is a dark Adeonianasteroid from the central regions of theasteroid belt, approximately 21 kilometers in diameter. It was discovered on 4 February 1932, by astronomerLuigi Volta at theObservatory of Turin in Pino Torinese, Italy.[15] It was later named after the Italian village ofPredappio.[2]
Predappia is a member of theAdeona family (505),[4] a largefamily of carbonaceous asteroids in the intermediary main belt, named after145 Adeona. It is also dynamically classified as a member of theEunomia family (502), the largest in the intermediate main belt with more than 5,000 stony asteroids.[3][16]: 23
It orbits the Sun in thecentral asteroid belt at a distance of 2.3–3.0 AU once every 4 years and 4 months (1,591 days). Its orbit has aneccentricity of 0.14 and aninclination of 12° with respect to theecliptic.[1] The body'sobservation arc begins at Uccle in March 1941, more than 9 years after to its official discovery observation at Pino Torinese.[15]
Predappia'sspectral type is unknown. Although the LCDB assumes anS-type (due to its dynamical classification to the stony Eunomia family), a low albedo of 0.0644 is derived(see below) which is typical for carbonaceousC-type asteroids and in agreement with the overall spectral type of the Adeona family (505).[3][16]: 23
Photometric observations of the asteroid during 2006 byBrian Warner at the Palmer Divide Observatory (716) in Colorado Springs, Colorado, were used to generate alightcurve with a period of 8.94 ± 0.02 hours and a variation in brightness of 0.03 ± 0.01magnitude (U=2-).[12][a] Other observations obtained a poorly rated lightcurve with a divergent period of 6.13 and 24 hours, respectively.[11][13]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Predappia measures between 19.96 and 32.14 kilometers in diameter and its surface has analbedo between 0.02 and 0.0771.[5][6][7][8][9][10]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0644 and a diameter of 19.91 kilometers based on anabsolute magnitude of 12.1.[3]
Thisminor planet was named after the Italian village ofPredappio near Forli, known for being the birthplace ofBenito Mussolini, the founder of Italian Fascism and Italian Dictator until 1943. The author of theDictionary of Minor Planet Names,Lutz Schmadel, contacted Italian astronomerPaul G. Comba, who confirmed that this naming was "another clear instance of homage to him".[2] Predappio has become a site of pilgrimage for Italian and otherneofascists.[17][18]
