2672 Písek

2672 Písek, provisional designation 1979 KC, is a Eunomia asteroid from the central regions of the asteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 31 May 1979, by Yugoslav astronomer Jaroslav Květoň at the Kleť Observatory in the Czech Republic.[1] The likely elongated asteroid is a suspected tumbler and a slow rotator with an exceptionally long period of 831 hours.[10] It was named after the Czech town of Písek.[2]

2672 Písek
Discovery [1]
Discovered byJ. Kveton
Discovery siteKleť Obs.
Discovery date31 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 arc64.64 yr (23,609 d)
Aphelion3.0006 AU
Perihelion2.2257 AU
2.6132 AU
Eccentricity0.1483
4.22 yr (1,543 d)
44.692°
0° 13m 59.88s / day
Inclination14.139°
129.02°
152.35°
Physical characteristics
Mean diameter
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]

    Orbit and classification

    Písek is a core member of the Eunomia family (502),[4] a prominent family of stony S-type asteroid and the largest one in the intermediate main belt with more than 5,000 members.[11] It orbits the Sun in the central 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 an eccentricity of 0.15 and an inclination of 14° with respect to the ecliptic.[3]

    The asteroid was first observed as 1937 NP at Johannesburg Observatory in July 1937. The body's observation arc begins with its observation as 1953 EJ1 at Goethe Link Observatory in March 1953, more than 26 years prior to its official discovery observation at Klet.[1]

    Naming

    This minor planet was named after the Czech town of Písek, located in the western South Bohemian Region known for its many prolific Czech writers and artists.[2] The official naming citation was published by the Minor Planet Center on 28 January 1983 (M.P.C. 7620).[12]

    Physical characteristics

    Písek is an assumed S-type asteroid,[10] which agrees with the overall spectral type for members of the Eunomia family.[11]: 23  Conversely, the space-based surveys found an albedo that is typical for a carbonaceous C-type or potentially darker D- and P-type asteroid (see below).

    Rotation period

    Between May and July 2017, a rotational lightcurve of Písek was obtained from photometric observations by Vladimir Benishek at Belgrade Astronomical Observatory in Serbia. Lightcurve analysis gave a rotation period of 831±3 hours with a high brightness amplitude of 0.90 magnitude, indicative of a non-spherical shape (U=2+).[9][10]

    Diameter and albedo

    According to the survey carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Písek measures between 20.18 and 29.60 kilometers in diameter and its surface has an albedo between 0.0294 and 0.091.[5][6][8][7]

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo of 0.21 – derived from 15 Eunomia, the parent body of the Eunomia family– and consequently calculates a much smaller diameter of 9.60 kilometers based on an absolute magnitude of 12.4.[10]

    References
    1. "2672 Pisek (1979 KC)". Minor Planet Center. Retrieved 1 July 2018.
    2. Schmadel, Lutz D. (2007). "(2672) Písek". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 219. doi:10.1007/978-3-540-29925-7_2673. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 2672 Pisek (1979 KC)" (2017-10-29 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2018.
    4. "Asteroid 2672 Pisek". Small Bodies Data Ferret. Retrieved 1 July 2018.
    5. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 1 July 2018.
    6. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR-A-COMPIL-5-NEOWISEDIAM-V1.0. Bibcode:2016PDSS..247.....M. Retrieved 1 July 2018.
    7. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    8. Masiero, Joseph R.; Nugent, C.; Mainzer, A. K.; Wright, E. L.; Bauer, J. M.; Cutri, R. M.; et al. (October 2017). "NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos". The Astronomical Journal. 154 (4): 10. arXiv:1708.09504. Bibcode:2017AJ....154..168M. doi:10.3847/1538-3881/aa89ec.
    9. Benishek, Vladimir (January 2018). "Lightcurve and Rotation Period Determinations for 29 Asteroids". The Minor Planet Bulletin. 45 (1): 82–91. Bibcode:2018MPBu...45...82B. ISSN 1052-8091. Retrieved 1 July 2018.
    10. "LCDB Data for (2672) Písek". Asteroid Lightcurve Database (LCDB). Retrieved 1 July 2018.
    11. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 July 2018.

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