807 Ceraskia

807 Ceraskia (prov. designation: A915 HF or 1915 WY) is an elongated Eos asteroid from the outer regions of the asteroid belt. It was discovered on 18 April 1915, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The S-type asteroid has a rotation period of 7.4 hours and measures approximately 24 kilometers (15 miles) in diameter. It was named after Belarusian–Soviet astronomer Vitold Cerasky (1849–1925).[2]

807 Ceraskia
Shape model of Ceraskia from its lightcurve
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date18 April 1915
Designations
(807) Ceraskia
Named after
Vitold Cerasky (1849–1925)
(Belarusian–Soviet astronomer)[2]
A915 HF · 1974 QB3
A909 BK · A917 QA
1915 WY
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc111.04 yr (40,559 d)
Aphelion3.2127 AU
Perihelion2.8199 AU
3.0163 AU
Eccentricity0.0651
5.24 yr (1,913 d)
91.475°
0° 11m 17.16s / day
Inclination11.320°
132.20°
337.21°
Physical characteristics
Mean diameter
7.368±0.002 h[12]
  • (325.0°, 23.0°) (λ1/β1)[5]
  • (132.0°, 26.0°) (λ2/β2)[5]

    Orbit and classification

    Ceraskia is a core member the Eos family (606),[4][5][6] the largest asteroid family of the outer main belt consisting of nearly 10,000 known asteroids.[7][15] It orbits the Sun in the outer asteroid belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,913 days; semi-major axis of 3.02 AU). Its orbit has an eccentricity of 0.07 and an inclination of 11° with respect to the ecliptic.[3] The asteroid was first observed as A909 BK at Heidelberg Observatory on 18 January 1909. The body's observation arc begins at Vienna Observatory on 4 May 1915, or two weeks after its official discovery observation at Heidelberg by Max Wolf.[1]

    Naming

    This minor planet was named after Vitold Cerasky (1849–1925), a Belarusian–Soviet astronomer, professor of astronomy at Moscow University and long-time director of the Moscow Observatory (105). According to Nikolai Chernykh, Cerasky worked extensively on stellar and solar photometry.[2] His name is often transliterated as Vitold Tserasky and Witold Karlovich Ceraski. The lunar crater Tseraskiy is named after him.[16] His wife, Lidiya Tseraskaya (1855–1931), who was also an astronomer, was honored by the crater Tseraskaya on Venus.[17]

    The official naming citation was incorrect in the previous three editions of Dictionary of Minor Planet Names, which was based on The Names of the Minor Planets by Paul Herget in 1955 (H 80).[2]

    Physical characteristics

    In the Tholen classification, Ceraskia is a common, stony S-type asteroid.[3] In the taxonomic classification based on near-infrared colors from the MOVIS-catalog, the asteroid is a Cgx-subtype that is closest to a carbonaceous C-type and somewhat similar to a uncommon G-type and X-type asteroid. The MOVIS catalog was created from data gather by the VISTA Hemisphere Survey conducted with the VISTA telescope at Paranal Observatory in Chile.[13]

    Rotation period
    A three-dimensional model of 807 Ceraskia based on its light curve

    In October 2017, a rotational lightcurve of Ceraskia was obtained from photometric observations by Matthieu Conjat at Nice Observatory (020) in France. Lightcurve analysis gave a well-defined rotation period of 7.368±0.002 hours with a brightness variation of 0.39±0.01 magnitude (U=3).[7][12] The result supersedes previous observations by Richard Binzel in April 1983 and by astronomers at the Palomar Transient Factory in California on October 2012, which gave a period of 7.4 and 7.375±0.0030 hours with an amplitude of 0.25 and 0.49 magnitude, respectively (U=2/2).[14][18]

    Lightcurve inversion also modeled the body's shape and poles. In 2013, modelling by an international study using photometric data from the US Naval Observatory, the Uppsala Asteroid Photometric Catalogue, the Palomar Transient Factory and the Catalina Sky Survey gave a concurring sidereal period of 7.37390±0.00002 hours and two spin axes of (325.0°, 23.0°) and (132.0°, 26.0°) in ecliptic coordinates (λ, β). The body's very elongated shape had already been indicated by the relatively high brightness variation measured during the direct photometric observations.[5][19]

    Diameter and albedo

    According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Ceraskia measures (21.241±0.270), (26.24±1.3) and (30.38±0.56) kilometers in diameter and its surface has an albedo of (0.207±0.025), (0.1532±0.016) and (30.38±0.56), respectively.[8][10][11] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1368 and a diameter of 26.15 kilometers based on an absolute magnitude of 10.69.[7] Alternative mean-diameter measurements published by the WISE team include (21.361±0.302 km) and (22.83±1.91 km) with corresponding albedos of (0.2071±0.0485) and (0.222±0.091).[5][7]

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    References
    1. "807 Ceraskia (A915 HF)". Minor Planet Center. Retrieved 26 March 2020.
    2. Schmadel, Lutz D. (2007). "(807) Ceraskia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 75. doi:10.1007/978-3-540-29925-7_808. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 807 Ceraskia (A915 HF)" (2020-02-04 last obs.). Jet Propulsion Laboratory. Retrieved 26 March 2020.
    4. "Asteroid 807 Ceraskia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 26 March 2020.
    5. "Asteroid 807 Ceraskia – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 March 2020.
    6. Zappalà, V.; Bendjoya, Ph.; Cellino, A.; Farinella, P.; Froeschle, C. (1997). "Asteroid Dynamical Families". NASA Planetary Data System: EAR-A-5-DDR-FAMILY-V4.1. Retrieved 26 March 2020.} (PDS main page)
    7. "LCDB Data for (807) Ceraskia". Asteroid Lightcurve Database (LCDB). Retrieved 26 March 2020.
    8. 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 26 March 2020.
    9. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
    10. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 26 March 2020.
    11. 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. Retrieved 26 March 2020. (online, AcuA catalog p. 153)
    12. Behrend, Raoul. "Asteroids and comets rotation curves – (807) Ceraskia". Geneva Observatory. Retrieved 25 March 2020.
    13. Popescu, M.; Licandro, J.; Carvano, J. M.; Stoicescu, R.; de León, J.; Morate, D.; et al. (September 2018). "Taxonomic classification of asteroids based on MOVIS near-infrared colors". Astronomy and Astrophysics. 617: A12. arXiv:1807.00713. Bibcode:2018A&A...617A..12P. doi:10.1051/0004-6361/201833023. ISSN 0004-6361. (VizieR online cat)
    14. Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035.
    15. 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.
    16. "Lunar crater Tseraskiy (Ceraski)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
    17. "Tseraskaya on Venus". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
    18. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75.
    19. Hanuš, J.; Ďurech, J.; Brož, M.; Marciniak, A.; Warner, B. D.; Pilcher, F.; et al. (March 2013). "Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution". Astronomy and Astrophysics. 551: A67. arXiv:1301.6943. Bibcode:2013A&A...551A..67H. doi:10.1051/0004-6361/201220701. ISSN 0004-6361.
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