| Discovery[1][2] | |
|---|---|
| Discovered by | G. Neujmin |
| Discovery site | Simeiz Obs. |
| Discovery date | 8 July 1932 |
| Designations | |
| (1255) Schilowa | |
Named after | Maria Zhilova (Russian astronomer) |
| 1932 NC · 1933 VB A905 UC | |
| main-belt · (outer)[3] background[4] | |
| Orbital characteristics[2] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.54yr (41,472 d) |
| Aphelion | 3.6891AU |
| Perihelion | 2.5983 AU |
| 3.1437 AU | |
| Eccentricity | 0.1735 |
| 5.57 yr (2,036 d) | |
| 122.84° | |
| 0° 10m 36.48s / day | |
| Inclination | 8.5473° |
| 237.62° | |
| 133.51° | |
| Physical characteristics | |
| 32.52±1.6 km[5] 33.669±0.718 km[6] 35.846±2.824 km[7] 36.49±0.51 km[8] 37.24±4.78 km[9] | |
| 29.536±0.006 h[3][10][11] | |
| 0.071±0.031[9] 0.111±0.004[8] 0.1144±0.0263[7] 0.130±0.027[6] 0.1389±0.015[5] | |
| S(assumed)[3] | |
| 10.20[5][7][8] 10.3[1][2][3] 10.63[9] | |
1255 Schilowa, provisional designation1932 NC, is a backgroundasteroid from the outer regions of theasteroid belt, approximately 34 kilometers (21 miles) in diameter. It was discovered on 8 July 1932, by Soviet astronomerGrigory Neujmin at theSimeiz Observatory on the Crimean peninsula.[1] The asteroid has a longer-than averagerotation period of 29.5 hours. It was named afterMariya Zhilova (Schilowa), who was Russia's first professional female astronomer.[12]
Schilowa is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in theouter main-belt at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,036 days;semi-major axis of 3.14 AU). Its orbit has aneccentricity of 0.17 and aninclination of 9° with respect to theecliptic.[2]
The asteroid was first observed asA905 UC atHeidelberg Observatory in October 1905. The body'sobservation arc began one week later at Heidelberg in November 1905, almost 27 years prior to its official discovery observation at Simeiz.[1]
Thisminor planet was named afterMariya Vasilyevna Zhilova (1870–1934), also known Mariya Shilova or Schilowa, a Russian astronomer at thePulkovo Observatory near Saint Petersburg. She was Russia's first professional female astronomer and awarded for her work oncelestial mechanics by the Russian Astronomical Society in 1905. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 115).[12]
Schilowa is an assumedS-type asteroid.[3]
Between 2005 and 2009, three rotationallightcurves ofSchilowa were obtained from photometric observations by European astronomersPierre Antonini,Laurent Bernasconi,René Roy,Reiner Stoss,Jaime Nomen,Salvador Sánchez,Raoul Behrend. Lightcurve analysis gave arotation period of 29.536 hours (also 24 h and 29.7 h) with a brightness amplitude between 0.09 and 0.15magnitude (U=2 and 2/2-).[10]
In 2013, an international study modeled a lightcurve from various data sources including the Uppsala Asteroid Photometric Catalogue and thePalomar Transient Factory survey. The lightcurve gave a sidereal period of 29.4674 hours and allowed for the determination of two spin axis of (156.0°, −4.0°) and (338.0°, 15.0°) inecliptic coordinates (λ, β).[13]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Schilowa measures between 32.52 and 37.24 kilometers in diameter and its surface has analbedo between 0.071 and 0.1389.[5][6][7][8][9] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1273 and a diameter of 32.44 kilometers based on anabsolute magnitude of 10.3.[3]
