1425 Tuorla
Main-belt asteroid
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1425 Tuorla, provisional designation 1937 GB, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 3 April 1937, by Finnish astronomer Kustaa Inkeri at the Iso-Heikkilä Observatory in Turku, southwestern Finland.[12] The asteroid was named after the Tuorla Observatory of the University of Turku.[2] It was Kustaa Inkeri's only asteroid discovery.[13]
| Discovery[1] | |
|---|---|
| Discovered by | K. Inkeri |
| Discovery site | Turku Obs. |
| Discovery date | 3 April 1937 |
| Designations | |
| (1425) Tuorla | |
Named after | Tuorla Observatory[2] (Inst. for Astronomy and Optics) |
| 1937 GB · 1950 KC 1950 LQ | |
| main-belt · (middle) Eunomia[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 67.14 yr (24,522 days) |
| Aphelion | 2.8766 AU |
| Perihelion | 2.3483 AU |
| 2.6125 AU | |
| Eccentricity | 0.1011 |
| 4.22 yr (1,542 days) | |
| 40.218° | |
| 0° 14m 0.24s / day | |
| Inclination | 12.975° |
| 185.99° | |
| 342.25° | |
| Physical characteristics | |
| Dimensions | 11.795±0.874 km[5] 14.34±1.08 km[6] 14.94±1.1 km[3][7] |
| 6.76±0.01 h[a] 6.97±0.01 h[8] 7.748±0.0027 h[9] 7.75±0.06 h[10] | |
| 0.2389 (derived)[3] 0.2390±0.040[7] 0.260±0.041[6] 0.383±0.083[5] | |
| S[3][11] | |
| 11.173±0.003 (R)[9] · 11.30[3][5][6][7] · 11.4[1] · 11.91±0.41[11] | |
Orbit and classification
Tuorla is a member of the Eunomia family (502),[3][4] a prominent family of stony asteroids and the largest one in the intermediate main belt with more than 5,000 members.[14]:â23â It orbits the Sun at a distance of 2.3â2.9 AU once every 4 years and 3 months (1,542 days). Its orbit has an eccentricity of 0.10 and an inclination of 13° with respect to the ecliptic.[1] The body's observation arc begins at Turku, the night before its official discovery observation.[12]
Physical characteristics
Tuorla has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey,[11] in accordance with the overall spectral type for members of the Eunomia family.[14]:â23â
Rotation period
In April 2013, the so-far best-rated a rotational lightcurve of Tuorla was obtained from photometric observations by astronomer Vladimir Benishek at Belgrade Observatory in Serbia. Lightcurve analysis gave a well-defined rotation period of 7.75 hours (h) with a brightness variation of 0.24 magnitude (U=3).[10] Other lightcurves were obtained by Alfonso Carreno Garceran (6.76 h),[a] Laurent Bernasconi (7.75 h),[8] and the Palomar Transient Factory (7.748 h),[9]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Tuorla measures between 11.795 and 14.94 kilometers in diameter and its surface has an albedo between 0.2390 and 0.383.[5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2389 and adopts a diameter of 14.94 kilometers from IRAS, based on an absolute magnitude of 11.3.[3]
Naming
This minor planet was named after the Tuorla Observatory, the Research Institute for Astronomy and Optics, of the University of Turku, located in Piikkiö near Turku, Finland.[2] The Tuorla Observatory was established by prolific minor-planet discoverer Yrjö Väisälä in 1952, as an alternative to the Iso-Heikkilä Observatory, where this asteroid was discovered. The official naming citation was published by the Minor Planet Center on 30 January 1964 (M.P.C. 2277).[15]
