| Discovery[1] | |
|---|---|
| Discovered by | G. van Biesbroeck |
| Discovery site | Yerkes Obs. |
| Discovery date | 4 September 1924 |
| Designations | |
| (1033) Simona | |
Named after | Simona Van Biesbroeck (discoverer's daughter)[2] |
| 1924 SM · 1937 CG | |
| main-belt · Eos[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 80.76 yr (29,498 days) |
| Aphelion | 3.3538AU |
| Perihelion | 2.6474 AU |
| 3.0006 AU | |
| Eccentricity | 0.1177 |
| 5.20yr (1,898 days) | |
| 268.12° | |
| 0° 11m 22.56s / day | |
| Inclination | 10.664° |
| 188.95° | |
| 217.96° | |
| Physical characteristics | |
| Dimensions | 19.195±0.194 km[4] 20.247±0.260 km[5] 20.29±6.38 km[6] 23.72±1.70 km[7] 24.71 km(derived)[3] |
| 9.6h[8] 10.07±0.06 h[9] | |
| 0.1050(derived)[3] 0.12±0.10[6] 0.125±0.019[7] 0.1725±0.0201[5] 0.196±0.041[4] | |
| S[3] | |
| 11.0[5][7] · 11.1[1][3][6] | |
1033 Simona, provisional designation1924 SM, is a stony Eoanasteroid from the outer regions of theasteroid belt, approximately 20 kilometers in diameter. The asteroid was discovered byGeorge Van Biesbroeck in 1924, who named it after his daughter Simona.
Simona was discovered on 4 September 1924, by Belgian–American astronomerGeorge Van Biesbroeck atYerkes Observatory in Wisconsin, United States.[10] On the following night, it was independently discovered by Soviet astronomerSergey Belyavsky atSimeiz Observatory on the Crimean peninsula.[2] As an anomaly, the asteroid'sastrometric discovery record from 1924,1924 SM, is missing in the observational history table provided by theMinor Planet Center. The first given observation is from 30 August 1938, made atHeidelberg Observatory.[10]
Simona is a member of theEos family, a collisionalouter-belt family of untypicalstony asteroids. It orbits the Sun at a distance of 2.6–3.4 AU once every 5 years and 2 months (1,898 days). Its orbit has aneccentricity of 0.12 and aninclination of 11° with respect to theecliptic.[1] The body'sobservation arc begins almost 13 years after its official discovery observation, with its identification1937 CG atUccle Observatory in February 1937.[10]
In September 2007,photometric observations at theOakley Observatory in Indiana, United States, gave a fragmentarylightcurve with arotation period of 10.07 hours and a brightness variation of 0.15magnitude (U=1+).[9]
Another fragmentary lightcurve ofSimona was obtained by French amateur astronomerRené Roy in August 2012. Lightcurve analysis gave a period of 9.6 hours with an amplitude of 0.02magnitude (U=n.a.).[8]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Simona measures between 19.195 and 23.72 kilometers in diameter and its surface has analbedo between 0.12 and 0.196.[4][5][6][7] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1050 and a diameter of 24.71 kilometers based on anabsolute magnitude of 11.1.[3]
Thisminor planet was named after the discoverer's daughter Simona Titus (née Van Biesbroeck). The official naming citation was published byPaul Herget inThe Names of the Minor Planets (H 98).[2]
