3982 Kastel'

3982 Kastel', provisional designation 1984 JP1, is a Florian asteroid and a suspected binary system[8] from the inner regions of the asteroid belt, approximately 6.9 kilometers in diameter.

3982 Kastel'
Discovery [1]
Discovered byL. G. Karachkina
Discovery siteCrimean Astrophysical Obs.
Discovery date2 May 1984
Designations
(3982) Kastel'
Named after
Galina Ričardovna Kastel'
(astronomer)[2]
1984 JP1 · 1930 MF
1947 NE · 1954 RC
1978 TT5
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.77 yr (31,691 days)
Aphelion2.7546 AU
Perihelion1.7625 AU
2.2586 AU
Eccentricity0.2196
3.39 yr (1,240 days)
230.45°
0° 17m 25.44s / day
Inclination5.2970°
251.91°
50.950°
Physical characteristics
Dimensions6.790±0.363 km[4][5]
6.90 km (taken)[3]
6.901 km[6]
8.4877±0.0005 h[lower-alpha 1]
8.488±0.003 h[7]
0.1695[6]
0.201±0.031[4][5]
P [4] · S [3]
12.9[1] · 13.2[4] · 13.35±0.08[3][6]

    It was discovered on 2 May 1984, by Russian astronomer Lyudmila Karachkina at the Crimean Astrophysical Observatory in Nauchnij on the Crimean peninsula.[9] It is named after Soviet astronomer Galina Kastel'.[2]

    Classification and orbit

    Kastel' is a member of the Flora family, one of the largest families of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 5 months (1,240 days). Its orbit has an eccentricity of 0.22 and an inclination of 5° with respect to the ecliptic.[1] Kastel' was first identified as 1930 MF at Lowell Observatory in 1930, extending the asteroid's observation arc by 54 years prior to its discovery observation.[9]

    Physical characteristics

    Kastel' has been characterized as a dark and reddish P-type asteroid by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, despite measuring an albedo of 0.20.[4] It is also an assumed S-type asteroid.[3]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Kastel' measures 6.79 kilometers in diameter and its surface has an albedo of 0.201,[4][5] while Petr Pravec's revised estimates of the thermal WISE observation gave a lower albedo of 0.1695 and consequently a larger diameter of 6.90 kilometers with an absolute magnitude of 13.35.[6]

    Lightcurve

    In September 2009 and February 2014, two rotational lightcurves were obtained for this asteroid. Lightcurve analysis gave a rotation period of 8.4877 and 8.488 hours with a brightness variation of 0.27 and 0.28 magnitude, respectively (U=n.a.).[7][lower-alpha 1]

    Suspected binary

    During the first of the two a photometric observations – a collaboration between Czech astronomers Petr Pravec, Peter Kušnirák, Leonard Kornoš and Jozef Világi at Ondřejov Observatory, as well as American astronomers Donald Pray, Russel Durkee, Walter R. Cooney Jr., John Gross and Dirk Terrell at several locations in the United States – it was revealed, that Kastel's lightcurve consisted of two linearly additive components, indicative for the presence of an asteroid moon. However, no attenuations were observed, which typically occur when the primary and secondary body are eclipsing each other.[7] After a second observation in 2014, the binary nature of Kastel' still remains uncertain.[3][8][lower-alpha 1] The "Johnstonsarchive" gives no estimates.[10]

    Naming

    This minor planet was named in honor of Soviet astronomer Galina Ričardovna Kastel' astronomer at the Institute for Theoretical Astronomy (ITA) at Saint Petersburg (then Leningrad). A discoverer of minor planets herself, she is a known expert of the motions of small Solar System bodies and was involved with astrometric work at the discovering observatory.[2] The approved naming citation was published by the Minor Planet Center on 28 May 1991 (M.P.C. 18306).[11]

    Notes
    1. Pravec (2014) web: rotation period 8.4877±0.0005 hours with a brightness amplitude of 0.28 mag. Summary figures for (3982) Kastel' at Collaborative Asteroid Lightcurve Link (CALL) and Pravec, P.; Wolf, M.; Sarounova, L. (2014)
    gollark: Don't worry, we are still in the process of determining a challenge.
    gollark: Your ideas will be considered and/or converted into muons.
    gollark: HTML5 specifies a parsing algorithm.
    gollark: Technically, everything is "valid HTML".
    gollark: Interesting idea. That sounds definitely possible.

    References
    1. "JPL Small-Body Database Browser: 3982 Kastel (1984 JP1)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
    2. Schmadel, Lutz D. (2007). "(3982) Kastel". Dictionary of Minor Planet Names – (3982) Kastel. Springer Berlin Heidelberg. p. 339. doi:10.1007/978-3-540-29925-7_3969. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (3982) Kastel'". Asteroid Lightcurve Database (LCDB). Retrieved 17 November 2016.
    4. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 17 November 2016.
    6. Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 17 November 2016.
    7. Pravec, P.; Kusnirak, P.; Kornos, L.; Vilagi, J.; Pray, D.; Durkee, R.; et al. (October 2005). "(3982) Kastel". IAU Circ. 8609 (8609): 2. Bibcode:2005IAUC.8609....2P. Retrieved 17 November 2016.
    8. "Photometric Survey for Asynchronous Binary Asteroids". Astronomical Institute of the Czech Academy of Sciences (ASU). Retrieved 17 November 2016.
    9. "3982 Kastel (1984 JP1)". Minor Planet Center. Retrieved 17 November 2016.
    10. Johnston, Robert (21 September 2014). "(3982) Kastel". johnstonsarchive.net. Retrieved 30 March 2017.
    11. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 November 2016.
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