| Discovery[1] | |
|---|---|
| Discovered by | P. Shajn |
| Discovery site | Simeiz Obs. |
| Discovery date | 11 September 1928 |
| Designations | |
| (1120) Cannonia | |
Named after | Annie Jump Cannon (American astronomer)[2] |
| 1928 RV · 1956 AG | |
| main-belt · (inner) Flora[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 74.35 yr (27,155 days) |
| Aphelion | 2.5616AU |
| Perihelion | 1.8707 AU |
| 2.2161 AU | |
| Eccentricity | 0.1559 |
| 3.30yr (1,205 days) | |
| 333.96° | |
| 0° 17m 55.32s / day | |
| Inclination | 4.0492° |
| 158.67° | |
| 219.80° | |
| Physical characteristics | |
| Dimensions | 8.10±1.25 km[5] 9.92±0.70 km[6] 10.184±0.140 km[7][8] 10.80 km(calculated)[3] 10.80±0.75 km[9] |
| 3.79 h[a] 3.816±0.002h[10] | |
| 0.129±0.024[7] 0.1292±0.0240[8] 0.137±0.021[6] 0.24(assumed)[3] 0.263±0.062[9] 0.49±0.28[5] | |
| S[3] | |
| 11.90[9] · 12.00[1][3][5] · 12.25±0.39[11] · 12.80[6][8] | |
1120 Cannonia, provisional designation1928 RV, is a stony Florianasteroid from the inner regions of theasteroid belt, approximately 10 kilometers in diameter. Discovered byPelageya Shajn at Simeiz in 1928, it was named after American astronomerAnnie Jump Cannon.[2]
Cannonia was discovered on 11 September 1928, by Russian astronomerPelageya Shajn at theSimeiz Observatory on the Crimean peninsula.[12] Two days later, it was independently discovered byGrigory Neujmin (also at Simeiz), and ten days later byEugène Delporte atUccle Observatory inBelgium.[2] The independent discoveries, however, are not officially acknowledged by theMinor Planet Center.[12]
Cannonia is a member of theFlora family (402), a giantasteroid family and the largest family of stony asteroids in the main-belt.[3][4][13]: 23 It orbits the Sun in theinner main-belt at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,205 days). Its orbit has aneccentricity of 0.16 and aninclination of 4° with respect to theecliptic.[1]
The body'sobservation arc begins unusually late at Uccle in January 1946, or nearly 18 years after its official discovery observation.[12]
Cannonia is an assumed stonyS-type asteroid, according to its family membership.[3][13]: 23
In November 2004, a rotationallightcurve ofCannonia was obtained from photometric observations by American astronomer John Menke at his Menke Observatory in Barnesville, Maryland. Lightcurve analysis gave a well-definedrotation period of 3.816 hours with a brightness amplitude of 0.16magnitude (U=3).[10] An anonymously submitted lightcurve gave a similar period of3.79 hours (U=2).[a]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Cannonia measures between 8.1 and 10.8 kilometers in diameter and its surface has analbedo between 0.129 and 0.49.[5][6][7][8][9]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo of 0.24 – derived from8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 10.8 kilometers with anabsolute magnitude of 12.0.[3]
Thisminor planet was named after American astronomerAnnie Jump Cannon (1863–1941), who developed a taxonomic system of stellarspectral types at Harvard University, and subsequently classified about 225,000 stars with these types for theHenry Draper Catalog.[2] The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 105). She is also honored by the lunar craterCannon.[2]
