| Discovery[1] | |
|---|---|
| Discovered by | Purple Mountain Obs. |
| Discovery site | Purple Mountain Obs. |
| Discovery date | 30 December 1965 |
| Designations | |
| (2197) Shanghai | |
Named after | Shanghai(Chinese city)[2] |
| 1965 YN · 1942 VN 1955 DA · 1964 UN 1967 JT · 1975 SD | |
| main-belt · Themis[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 62.10 yr (22,682 days) |
| Aphelion | 3.5508AU |
| Perihelion | 2.7595 AU |
| 3.1551 AU | |
| Eccentricity | 0.1254 |
| 5.60yr (2,047 days) | |
| 60.923° | |
| 0° 10m 33.24s / day | |
| Inclination | 2.4980° |
| 56.369° | |
| 70.991° | |
| Physical characteristics | |
| Dimensions | 20.198±0.136 km[1][4] 20.20±0.14 km[3][4] 22.23 km(derived)[3] 23.88±0.70 km[5] |
| 5.9384±0.0023h[6] 5.99±0.05 h[7] | |
| 0.0898(derived)[3] 0.106±0.007[5] 0.119±0.014[4] | |
| C[3] | |
| 11.20[5] · 11.40[4] · 11.304±0.001(R)[6] · 11.5[1][3] · 11.54±0.19[8] | |
2197 Shanghai, provisional designation1965 YN, is a carbonaceous Themistianasteroid from the outer region of theasteroid belt, approximately 22 kilometers in diameter.
The asteroid was discovered on 30 December 1965, by astronomers at thePurple Mountain Observatory in Nanjing, China, and named after the city ofShanghai.[2][9]
Shanghai is a member of theThemis family, a dynamical family ofouter-belt asteroids with nearly coplanarecliptical orbits. It orbits the Sun at a distance of 2.8–3.6 AU once every 5 years and 7 months (2,047 days). Its orbit has aneccentricity of 0.13 and aninclination of 2° with respect to theecliptic.[1]
The dark body has been characterized as aC-type asteroid.[3]
In December 2010, a rotationallightcurve ofShanghai was obtained for this asteroid from photometric observations taken at the U.S.Palomar Transient Factory in California. It gave arotation period of5.9384 hours with a brightness variation of 0.16magnitude (U=2).[6]
One month later in January 2011, a similar period of5.99 hours with an amplitude of 0.16 magnitude was derived by French amateur astronomerPierre Antonini (U=2).[7]
According to the surveys carried out by the JapaneseAkari satellite and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Shanghai measures 20.2 and 23.9 kilometers in diameter and its surface has analbedo of 0.119 and 0.106, respectively.[4][5] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0898 and a diameter of 22.2 kilometers with anabsolute magnitude of 11.5.[3]
Thisminor planet is named afterShanghai, the most populous city of China (pop. 24 million as of 2014). Located in theYangtze River Delta in eastern China, it has theworld's busiest container port.[2] The official naming citation was published by theMinor Planet Center on 1 June 1981 (M.P.C. 6059).[10]
