| Discovery[1] | |
|---|---|
| Discovered by | J. Kveton |
| Discovery site | Kleť Obs. |
| Discovery date | 31 May 1979 |
| Designations | |
| (2672) Písek | |
Named after | Písek(Czech town)[2] |
| 1979 KC · 1937 NP 1953 EJ1 · 1953 ET1 1978 EF1 | |
| main-belt[1][3] · (middle) Eunomia[4] | |
| Orbital characteristics[3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 64.64yr (23,609 d) |
| Aphelion | 3.0006AU |
| Perihelion | 2.2257 AU |
| 2.6132 AU | |
| Eccentricity | 0.1483 |
| 4.22 yr (1,543 d) | |
| 44.692° | |
| 0° 13m 59.88s / day | |
| Inclination | 14.139° |
| 129.02° | |
| 152.35° | |
| Physical characteristics | |
| 20.18±0.8 km[5] 22.624±0.786 km[6] 26.45±0.77 km[7] 29.594±7.961 km[8] | |
| 831±3 h[9] | |
| 0.0294±0.0261[8] 0.045±0.008[6] 0.053±0.003[7] 0.0907±0.008[5] | |
| S (assumed)[10] | |
| 11.70[7] 12.20[6] 12.4[1][3][10] 12.41[8] | |
2672 Písek, provisional designation1979 KC, is aEunomia asteroid from the central regions of theasteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 31 May 1979, by Yugoslav astronomerJaroslav Květoň at theKleť Observatory in the Czech Republic.[1] The likely elongatedasteroid is a suspectedtumbler and aslow rotator with an exceptionally long period of 831 hours.[10] It was named after the Czech town ofPísek.[2]
Písek is a core member of theEunomia family (502),[4] a prominentfamily of stonyS-type asteroid and the largest one in the intermediate main belt with more than 5,000 members.[11] It orbits the Sun in thecentral main-belt at a distance of 2.2–3.0 AU once every 4 years and 3 months (1,543 days;semi-major axis of 2.61 AU). Its orbit has aneccentricity of 0.15 and aninclination of 14° with respect to theecliptic.[3]
The asteroid was first observed as1937 NP atJohannesburg Observatory in July 1937. The body'sobservation arc begins with its observation as1953 EJ1 atGoethe Link Observatory in March 1953, more than 26 years prior to its official discovery observation at Klet.[1]
Thisminor planet was named after the Czech town ofPísek, located in the westernSouth Bohemian Region known for its many prolific Czech writers and artists.[2] The official naming citation was published by theMinor Planet Center on 28 January 1983 (M.P.C. 7620).[12]
Písek is an assumedS-type asteroid,[10] which agrees with the overallspectral type for members of the Eunomia family.[11]: 23 Conversely, the space-based surveys found an albedo that is typical for a carbonaceousC-type or potentially darkerD- andP-type asteroid(see below).
Between May and July 2017, a rotationallightcurve ofPísek was obtained fromphotometric observations by Vladimir Benishek atBelgrade Astronomical Observatory in Serbia. Lightcurve analysis gave arotation period of831±3 hours with a high brightness amplitude of 0.90magnitude, indicative of a non-spherical shape (U=2+).[9][10]
According to the survey carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Písek measures between 20.18 and 29.60 kilometers in diameter and its surface has analbedo between 0.0294 and 0.091.[5][6][8][7]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo of 0.21 – derived from15 Eunomia, the parent body of the Eunomia family– and consequently calculates a much smaller diameter of 9.60 kilometers based on anabsolute magnitude of 12.4.[10]
