_Dejan.png) Shape model of Dejan from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | F. Rigaux |
| Discovery site | Uccle Obs. |
| Discovery date | 15 September 1941 |
| Designations | |
| (1555) Dejan | |
Named after | Dejan Đurković(son of astronomerPetar Đurković)[2] |
| 1941 SA · 1932 PC 1934 CD1 · 1954 NJ | |
| main-belt · (middle)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 84.64 yr (30,913 days) |
| Aphelion | 3.4332AU |
| Perihelion | 1.9442 AU |
| 2.6887 AU | |
| Eccentricity | 0.2769 |
| 4.41yr (1,610 days) | |
| 71.768° | |
| 0° 13m 24.96s / day | |
| Inclination | 6.0200° |
| 318.08° | |
| 47.825° | |
| Physical characteristics | |
| Dimensions | 19.21 km(calculated)[3] 21.77±7.25 km[4] 23.199±0.314 km[5][6] 24.04±0.48 km[7] |
| 16.960±0.002h[8] | |
| 0.053±0.006[5] 0.0531±0.0056[6] 0.068±0.003[7] 0.08±0.09[4] 0.10(assumed)[3][a] | |
| S/C[3][a] | |
| 11.65[4] · 11.70[1][3][6][7] | |
1555 Dejan (provisional designation1941 SA) is anasteroid from thebackground population of the central regions of theasteroid belt, approximately 22 kilometers in diameter. It was discovered on 15 September 1941, by Belgian astronomerFernand Rigaux at theRoyal Observatory of Belgium in Uccle.[9] The asteroid was named after Dejan Đurković, son of Serbian astronomerPetar Đurković.
Dejan is a non-family asteroid from the main belt'sbackground population. It orbits the Sun in thecentral asteroid belt at a distance of 1.9–3.4 AU once every 4 years and 5 months (1,610 days). Its orbit has aneccentricity of 0.28 and aninclination of 6° with respect to theecliptic.[1] The body'sobservation arc begins with its first identification as1932 PC atJohannesburg Observatory in August 1932, more than 9 years prior to its official discovery observation at Uccle.[9]
Thisminor planet was named after Dejan Đurković, son ofPetar Đurković (1908–1981), a Serbian astronomer anddiscoverer of minor planets at theBelgrade Observatory. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 137).[2]
In September 2016, a rotationallightcurve of Dejan was obtained from photometric observations by the Spanish amateur astronomer group OBAS. Lightcurve analysis gave arotation period of 16.960 hours with a brightness variation of 0.41magnitude (U=2+).[8]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, Dejan measures 21.77 and 23.199 kilometers in diameter and its surface has analbedo of 0.053 and 0.08, respectively,[4][5][6] while the JapaneseAkari satellite found a diameter of 24.04 kilometers with an albedo of 0.068.[7]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.10 – a compromise value between the darkerC-type and brighterS-type asteroids – and calculates a diameter of 19.21 kilometers based on anabsolute magnitude of 11.7.[3][a]
