| Discovery[1] | |
|---|---|
| Discovered by | C.-I. Lagerkvist |
| Discovery site | La Silla Obs. |
| Discovery date | 16 March 1980 |
| Designations | |
| (7548) Engström | |
Named after | Albert Engström (Swedish artist)[2] |
| 1980 FW2 · 1993 QA4 1999 TS324 | |
| main-belt · Themis[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 36.88 yr (13,470 days) |
| Aphelion | 3.6490AU |
| Perihelion | 2.6410 AU |
| 3.1450 AU | |
| Eccentricity | 0.1603 |
| 5.58yr (2,037 days) | |
| 151.48° | |
| 0° 10m 36.12s / day | |
| Inclination | 0.3170° |
| 346.66° | |
| 296.30° | |
| Physical characteristics | |
| Dimensions | 7.70 km(calculated)[3] 9.43±3.04 km[4] 11.067±0.129 km[5][6] |
| 5.2309±0.0059h[7] | |
| 0.057±0.009[5][6] 0.06±0.05[4] 0.08(assumed)[3] | |
| C[3] | |
| 13.5[1][5] · 13.93[3] · 13.477±0.005(R)[7] · 13.64±0.21[8] · 13.75[4] | |
7548 Engström, provisional designation1980 FW2, is dark Themistianasteroid from the outer region of theasteroid belt, approximately 9 kilometers in diameter. It was discovered on 16 March 1980, by Swedish astronomerClaes-Ingvar Lagerkvist atESO'sLa Silla Observatory site in northern Chile.[9] The asteroid was later named after Swedish artistAlbert Engström.[2]
Engström is a member of theThemis family, a dynamical family ofouter-belt asteroids with nearly coplanarecliptical orbits. It orbits the Sun at a distance of 2.6–3.6 AU once every 5 years and 7 months (2,037 days). Its orbit has aneccentricity of 0.16 and aninclination of 0° with respect to the ecliptic.[1]
The asteroid'sobservation arc begins with its official discovery observation at La Silla.[9]
Engström is an assumed carbonaceousC-type asteroid.[3]
In September 2010,photometric observations by astronomers at thePalomar Transient Factory in California gave a rotationallightcurve with aperiod of5.2309 hours and a brightness amplitude of 0.35magnitude (U=2).[7]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Engström measures 9.43 and 11.1 kilometers in diameter and its surface has a lowalbedo of 0.057 and 0.060, respectively,[5][6] while theCollaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.08 and calculates a smaller diameter of 7.7 kilometers, based on anabsolute magnitude of 13.93.[3]
Thisminor planet was named afterAlbert Engström (1869–1940), Swedish artist and author, who became a member of the esteemedSwedish academy in 1922. He was born in Lönneberga,Småland. After his studies of Greek and Latin atUppsala University, he went on toValand School of Fine Arts inGothenburg. Renowned painter of caricatures and founder of the humor magazineStrix, he is best known for his black and white illustrations.[2] The official naming citation was published on 11 April 1998 (M.P.C.31611).[10]
