| Discovery[1] | |
|---|---|
| Discovered by | M. B. Protić |
| Discovery site | Belgrade Obs. |
| Discovery date | 20 March 1938 |
| Designations | |
| (1517) Beograd | |
Named after | Belgrade(capital city)[2] |
| 1938 FD · 1931 VF 1934 JF · 1935 ST 1942 CD · 1952 JG 1952 KM1 · 1971 VT 1978 EW6 | |
| main-belt · (middle)[3] Padua[4][5] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 85.34 yr (31,171 days) |
| Aphelion | 2.8392AU |
| Perihelion | 2.5935 AU |
| 2.7164 AU | |
| Eccentricity | 0.0452 |
| 4.48yr (1,635 days) | |
| 159.08° | |
| 0° 13m 12.72s / day | |
| Inclination | 5.2774° |
| 63.889° | |
| 231.89° | |
| Physical characteristics | |
| Dimensions | 30.97±9.33 km[6] 36.16±1.9 km(IRAS:20)[7] 37.90±0.48 km[8] 39.524±0.219 km[9] 42.003±0.213 km[10] |
| 6.943±0.004h[11] 6.9490±0.0006 h[12] | |
| 0.0364±0.0021[10] 0.045±0.001[8] 0.0491±0.005(IRAS:20)[7] 0.050±0.006[9] 0.07±0.03[6] | |
| SMASS =X[1] · P[10] · X[3] | |
| 11.1[3][6][7][8][10] · 11.23±0.66[13] | |
1517 Beograd (provisional designation1938 FD) is a dark Paduanasteroid from the central region of theasteroid belt, approximately 36 kilometers in diameter. It was discovered on 20 March 1938, by Serbian astronomerMilorad Protić atBelgrade Astronomical Observatory in Serbia.[14] It is named after the cityBelgrade.[2]
Beograd is member of the mid-sizedPadua family (507), anasteroid family named after363 Padua and at least 25 million years old. It consists of mostlyX-type asteroids, that were previously associated to110 Lydia (the Padua family is therefore also known as Lydia family). Together with theAgnia family, the Padua family is the only other family to have most of its members in a nonlinear secular resonance configuration with more than 75% of its members in a z1 librating state.[4][5]
This asteroid orbits the Sun in thecentral main-belt at a distance of 2.6–2.8 AU once every 4 years and 6 months (1,635 days). Its orbit has aneccentricity of 0.05 and aninclination of 5° with respect to theecliptic.[1] In 1931, Beograd was first identified as1931 VF atUccle Observatory, extending the body'sobservation arc by 7 years prior to its official discovery observation at Belgrade.[14]
French amateur astronomerLaurent Bernasconi obtained alightcurve of Beograd from photometric observations taken in March 2005. Light-curve analysis gave arotation period of 6.943 hours with a brightness variation of 0.18magnitude (U=2).[11] In April 2014, a lightcurve obtained by Vladimir Benishek at the discovering Belgrade Observatory gave a concurring period of 6.9490 hours with an amplitude of 0.23 magnitude (U=2).[12]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Beograd measures between 30.97 and 42.00 kilometers in diameter, and its surface has analbedo between 0.036 and 0.07.[6][8][9][10]
TheCollaborative Asteroid Lightcurve Link adopts the results from IRAS, that is, an albedo of 0.0491 and a diameter of 36.16 kilometers using an absolute magnitude of 11.1.[3][7]
Beograd is characterized as anX-type asteroid in theSMASS taxonomy, while NEOWISE classifies it as a reddishP-type asteroid due to its low albedo.[10]
Thisminor planet was named by the discoverer in honor of his native city and the capital of his country,Belgrade.[2] The officialnaming citation was published by theMinor Planet Center on 30 January 1964 (M.P.C. 2277).[15]
