| Discovery[1] | |
|---|---|
| Discovered by | E. Buchar |
| Discovery site | Algiers Obs. |
| Discovery date | 17 November 1925 |
| Designations | |
| (1055) Tynka | |
Named after | Tynka Buchar (discoverer's mother)[2] |
| 1925 WG · A902 TB | |
| main-belt · (inner) Flora[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 114.42 yr (41,793 days) |
| Aphelion | 2.6561AU |
| Perihelion | 1.7402 AU |
| 2.1981 AU | |
| Eccentricity | 0.2083 |
| 3.26yr (1,190 days) | |
| 129.33° | |
| 0° 18m 8.64s / day | |
| Inclination | 5.2778° |
| 147.15° | |
| 176.64° | |
| Physical characteristics | |
| Dimensions | 8.95±0.22 km[5] 10.31 km(calculated)[3] 13.479±0.225 km[6] |
| 5.9818±0.0003h[7] 11.75±0.01 h[8] 11.893±0.002 h[9] 11.893±0.005 h[10] | |
| 0.169±0.023[6] 0.24(assumed)[3] 0.350±0.019[5] | |
| Tholen =S[1] SMASS =S[1][3] | |
| 11.90[6] · 12.00[5] · 12.1[1][3] · 12.33±0.29[11] | |
1055 Tynka, provisional designation1925 WG, is a stony Florianasteroid from the inner regions of theasteroid belt, approximately 10 kilometers in diameter. It was discovered on 17 November 1925, by Czech astronomerEmil Buchar at theAlgiers Observatory in North Africa, who named it after his mother Tynka Buchar.[12]
Tynka is a member of theFlora family (402), a giantasteroid family and the largest family of stony asteroids in the main belt.[4][13]: 23 It orbits the Sun in theinner asteroid belt at a distance of 1.7–2.7 AU once every 3 years and 3 months (1,190 days). Its orbit has aneccentricity of 0.21 and aninclination of 5° with respect to theecliptic.[1]
The body'sobservation arc begins with its identification asA902 TB atHeidelberg Observatory in October 1902, more than 23 years prior to its official discovery observation at Algiers.[12]
Tynka is a common stonyS-type asteroid in both theTholen andSMASS classification,[1] which agrees with the overallspectral type for members of the Flora family.[13]: 23
Three rotationallightcurves ofTynka were independently obtained from photometric observations by astronomersDavid Higgins, Agnieszka Kryszczyńska andRobert Stephens. Lightcurve analysis gave arotation period of 11.75 and 11.893 hours with a brightness variation between 0.06 and 0.33magnitude (U=2-/2/2).[8][9][10] An alternative period solution of 5.9818 hours with an amplitude of 0.17 was measured by French amateur astronomerRené Roy in April 2012 (U=2).[7]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Tynka measures 8.95 and 13.48 kilometers in diameter and its surface has analbedo of 0.169 and 0.350, respectively.[5][6]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 10.31 kilometers based on anabsolute magnitude of 12.1.[3]
Thisminor planet was named by the discoverer after his mother Tynka Buchar. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 100).Emil Buchar (1901–1979) worked at the Institute of Astronomy and Geophysics at the Technical University in Prague and was a pioneer ofsatellite geodesy.[2] This asteroid was his only minor-planet discovery.[14] The minor planet3141 Buchar was named in his honor.
