| Discovery[1] | |
|---|---|
| Discovered by | P. Wild |
| Discovery site | Zimmerwald Obs. |
| Discovery date | 28 January 1989 |
| Designations | |
| (13025) Zürich | |
Named after | Zürich(Swiss city)[2] |
| 1989 BA | |
| main-belt · Phocaea[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 41.25 yr (15,066 days) |
| Aphelion | 3.0429AU |
| Perihelion | 1.7221 AU |
| 2.3825 AU | |
| Eccentricity | 0.2772 |
| 3.68yr (1,343 days) | |
| 279.41° | |
| 0° 16m 4.8s / day | |
| Inclination | 23.921° |
| 342.72° | |
| 140.93° | |
| Physical characteristics | |
| Dimensions | 4.89±0.10 km[5] 5.28 km(calculated)[3] |
| 18.53±0.02h[6] | |
| 0.23(assumed)[3] 0.322±0.083[5] | |
| S[3] | |
| 13.40[5] · 13.6[1][3] | |
13025 Zürich, provisional designation1989 BA, is a stony Phocaeaasteroid from the inner regions of theasteroid belt, approximately 5 kilometers in diameter. It was discovered on 28 January 1989, by Swiss astronomerPaul Wild atZimmerwald Observatory near Bern, Switzerland, and later named for the Swiss city ofZürich.[2][7]
The stonyS-type asteroid is a member of thePhocaea family (701),[4] a rather small group of asteroids with similar orbital characteristics, named after its largest member,25 Phocaea. It orbits the Sun in theinner main-belt at a distance of 1.7–3.0 AU once every 3 years and 8 months (1,343 days). Its orbit has aneccentricity of 0.28 and aninclination of 24° with respect to theecliptic.[1] A firstprecovery was obtained at the AustralianSiding Spring Observatory in 1975, extending the asteroid'sobservation arc by 14 years prior to its discovery.[7]
In November 2006, American astronomerBrian Warner obtained a rotationallightcurve from photometric observations taken at his Palmer Divide Observatory in Colorado. The lightcurve showed arotation period of18.53±0.02 hours and a brightness variation of 0.24 inmagnitude (U=2+).[6]
According to the survey carried out by NASA's space-basedWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, the asteroid measures 4.9 kilometers in diameter and its surface has a highalbedo of 0.32,[5] while theCollaborative Asteroid Lightcurve Link assumes an albedo of 0.23 and hence calculates a somewhat larger diameter of 5.3 kilometers with anabsolute magnitude of 13.6.[3]
The minor planet is named afterZürich, Switzerland's largest city and economic center, located at the northwestern tip ofLake Zürich. It was founded by the Romans in the 1st century BC on the rivers Sihl and Limmat and was then calledTuricum.[2] The official naming citation was published by theMinor Planet Center on 1 November 2001 (M.P.C. 43762).[8]
