_Glarona.png) Shape model ofGlarona from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | P. Wild |
| Discovery site | Zimmerwald Obs. |
| Discovery date | 19 September 1965 |
| Designations | |
| (1687) Glarona | |
| Pronunciation | /ɡləˈroʊnə/ |
Named after | Glarus(Swiss canton)[2] |
| 1965 SC · 1926 UA 1931 RB1 · 1942 PD 1945 EA · 1948 QN 1948 RD1 · 1954 TB 1954 UB2 · 1959 PG 1960 XD · 1965 UX A909 UA · A915 XC | |
| main-belt · Themis[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 107.45 yr (39,245 days) |
| Aphelion | 3.7148AU |
| Perihelion | 2.6004 AU |
| 3.1576 AU | |
| Eccentricity | 0.1765 |
| 5.61yr (2,049 days) | |
| 62.841° | |
| 0° 10m 32.52s / day | |
| Inclination | 2.6367° |
| 93.570° | |
| 316.57° | |
| Physical characteristics | |
| Dimensions | 31.52±0.50 km[4] 33.93±4.9 km(IRAS:6)[5] 36.75±0.93 km[6] 37.850±0.194[7] 42.007±0.515 km[8] |
| 6.3h[a] 6.49595±0.00001 h[9] | |
| 0.0795±0.0130[8] 0.107±0.006[6] 0.1219±0.044(IRAS:6)[5] 0.141±0.021[4][7] | |
| S[3] B–V = 0.670[1] U–B = 0.380[1] | |
| 10.25[1][3][4][5][6][8] · 10.51±0.28[10] | |
1687 Glarona (prov. designation:1965 SC) is a stonyThemis asteroid approximately 34 kilometers in diameter from the outer region of theasteroid belt. It was discovered by Swiss astronomerPaul Wild atZimmerwald Observatory near Bern, Switzerland, on 19 September 1965.[11] It was later named after the SwissCanton of Glarus.[2]
The asteroid is a member of theThemis family, one of the larger groups in the outer main-belt. It orbits the Sun at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,049 days). Its orbit has aneccentricity of 0.18 and aninclination of 3° with respect to theecliptic.[1] The firstprecovery was taken atHeidelberg Observatory in 1909, extending the asteroid'sobservation arc by 56 years prior to its discovery.[11]
Theminor planet was named for of the discoverer's home valley, the SwissCanton of Glarus and its capitalGlarus.[2] Paul Wild (1925–2014) was a prolific discoverer almost 100 asteroids,[12] and is well known for his discovery of cometWild 2, which was visited by NASA'sStardust mission. The officialnaming citation was published by theMinor Planet Center on 1 October 1969 (M.P.C. 2971).[13]
A rotationallightcurve obtained in the 1970s gave a well-definedrotation period of 6.3 hours with a brightness amplitude of 0.75 inmagnitude (U=3).[a] In March 2016, a second period was published based on data from the Lowell Photometric Database (LPD). Using lightcurve inversion and convex shape models, as well as distributed computing power and the help of individual volunteers, a period of6.49595±0.00001 hours could be obtained for this asteroid from the LPD's sparse-in-time photometry data (U=n.a.).[9]
According to the space-based surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, the asteroid measures between 31.5 and 42.0 kilometers in diameter and its surface has analbedo in the range of 0.0795 to 0.141.[4][5][6][7][8]
TheCollaborative Asteroid Lightcurve Link (CALL) gives preference to the results obtained by IRAS with an albedo of 0.1219 and a diameter of 33.93 kilometers.[3] CALL also classifies the Themistian asteroid as a stonyS-class body, which are otherwise known to have low albedos, showingspectra of carbonaceousC-type bodies(also seeCarbonaceous chondrites).[14]
