2478 Tokai

Last updated

2478 Tokai
Discovery  [1]
Discovered by T. Furuta
Discovery site Tōkai Obs. (879)
Discovery date4 May 1981
Designations
(2478) Tokai
Pronunciation /ˈtoʊkaɪ/
Japanese: [toːkai]
Named after
 Tōkai (Japanese city) [2]
1981 JC ·1931 HH
1932 SE ·1934 ED
1939 VH ·1951 JP
1955 OE ·1955 QV
1957 BD ·1972 RS
1978 NU2 ·1979 XR
1981 JT
main-belt  · Flora   [3]
Orbital characteristics   [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 84.68 yr (30,929 days)
Aphelion 2.3781 AU
Perihelion 2.0740 AU
2.2261 AU
Eccentricity 0.0683
3.32 yr (1,213 days)
103.28°
0° 17m 48.48s / day
Inclination 4.1389°
228.80°
233.85°
Known satellites 1 [3] [4] [5]
Physical characteristics
Dimensions9.238±0.112 km [6]
9.36±1.51 km [7]
9.71±0.49 km [8]
9.982±0.031 km [9]
10.087 km [10]
10.09 km (taken) [3]
25.88±0.01 h [lower-alpha 1]
25.885±0.007 h [11]
25.8913 h [lower-alpha 2]
25.97±0.11 h [12]
0.144±0.015 [8]
0.1957 [10]
0.2084±0.0371 [9]
0.252±0.045 [6]
0.33±0.20 [7]
SMASS = S   [1]  · S   [3]
11.88±0.03(R) [lower-alpha 2]  ·12.00 [7]  ·12.15±0.04 [13]  ·12.2 [1]  ·12.33 [9]  ·12.37±0.058 [3] [10]  ·12.80 [8]

    2478 Tokai, provisionally designated 1981 JC, is a stony Florian asteroid and binary system from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 4 May 1981, by Japanese astronomer Toshimasa Furuta at Tōkai Observatory ( 879 ), Japan. [14] The asteroid was named after the city of Tōkai. [2]

    Contents

    Orbit and classification

    Tokai is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.1–2.4  AU once every 3 years and 4 months (1,213 days). Its orbit has an eccentricity of 0.07 and an inclination of 4° with respect to the ecliptic. [1]

    Physical characteristics

    In the SMASS classification, Tokai is a common S-type asteroid. [1]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Tokai measures between 9.238 and 9.982 kilometers in diameter and its surface has an albedo between 0.144 and 0.33. [6] [7] [8] [9] The Collaborative Asteroid Lightcurve Link agrees with Petr Pravec's revised WISE-data, that is, an albedo of 0.1957 and a diameter of 10.09 kilometers with an absolute magnitude of 12.37. [3]

    Satellite

    Photometric observations in 2007, revealed a minor-planet moon in orbit of Tokai. It measures approximately 6 kilometers in diameter (lower limit diameter ratio of 0.72) and has an orbital period of 25.88 hours. [3] [4] [5]

    Naming

    This minor planet was named after the city of Tōkai, Japan, where the discoverer lives and the discovering observatory is located. [2] The approved naming citation was published by the Minor Planet Center on 8 February 1982 ( M.P.C. 6650). [15]

    Notes

    1. ↑ Oey (2011) web: rotation period 25.88 hours with a brightness amplitude of mag. Summary figures for (2478) Tokai at Collaborative Asteroid Lightcurve Link (CALL)
    2. 1 2 Pravec (2007) web: rotation period 25.8913 hours with a brightness amplitude of 0.41 mag. Q=3. Summary figures for (2478) Tokai at Collaborative Asteroid Lightcurve Link (CALL)

    Related Research Articles

    <span class="mw-page-title-main">166 Rhodope</span> Main-belt asteroid

    166 Rhodope is a dark background asteroid from the central region of the asteroid belt, approximately 55 kilometers in diameter. It was discovered on 15 August 1876, by German–American astronomer Christian Peters at the Litchfield Observatory in Clinton, New York, United States. The asteroid was named after Queen Rhodope from Greek mythology.

    1123 Shapleya, provisional designation 1928 ST, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 21 September 1928, by Russian astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula. It was named after American astronomer Harlow Shapley.

    4899 Candace, provisional designation 1988 JU, is a background asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 9 May 1988, by astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California, United States. The asteroid was named after American chemist Candace Kohl.

    1717 Arlon, provisional designation 1954 AC, is a binary Florian asteroid from the inner regions of the asteroid belt, approximately 8.5 kilometers in diameter.

    1240 Centenaria, provisional designation 1932 CD, is a background asteroid from the outer regions of the asteroid belt, approximately 60 kilometers in diameter. It was discovered on 5 February 1932, by astronomer Richard Schorr at the Bergedorf Observatory in Hamburg, Germany. The assumed C-type asteroid has a rotation period of 11.3 hours. It was named for the 100th anniversary of the discovering observatory.

    1991 Darwin, provisional designation 1967 JL, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter.

    <span class="mw-page-title-main">1244 Deira</span>

    1244 Deira is a dark background asteroid and slow rotator from the inner region of the asteroid belt. The X-type asteroid has an exceptionally long rotation period of 210.6 hours and measures approximately 31 kilometers in diameter. It was discovered on 25 May 1932, by English-born South African astronomer Cyril Jackson at the Union Observatory in Johannesburg, who named it after Deira, an old kingdom near his birthplace, the market town of Ossett, located in West Yorkshire, England.

    1806 Derice, provisional designation 1971 LC, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. Discovered on 13 June 1971, at the Bickley site of the Perth Observatory in Western Australia, it was the first discovery of a minor planet ever made in Oceania. The asteroid was named after the wife of Dennis Harwood, staff member at Bickley.

    1736 Floirac, provisional designation 1967 RA, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8.7 kilometer in diameter.

    3353 Jarvis, or by its provisional designation, 1981 YC, is a carbonaceous Hungaria asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid belt, approximately 10 kilometers in diameter.

    5333 Kanaya, provisional designation 1990 UH, is a carbonaceous asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter.

    <span class="mw-page-title-main">2094 Magnitka</span> Flora asteroid from the inner regions of the asteroid belt

    2094 Magnitka (prov. designation: 1971 TC2) is a Flora asteroid from the inner regions of the asteroid belt, approximately 12 kilometers (7.5 miles) in diameter. It was discovered on 12 October 1971, at and by the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. The discovery has not been attributed to an observing astronomer. It was later named for the city of Magnitogorsk.

    <span class="mw-page-title-main">1607 Mavis</span> Stony asteroid

    1607 Mavis, provisional designation 1950 RA, is a stony asteroid from the central region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 3 September 1950, by South African astronomer Ernest Johnson at Johannesburg Observatory in South Africa. It was later named after the wife of astronomer Jacobus Bruwer.

    3066 McFadden, provisional designation 1984 EO, is a stony background asteroid from the central regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 1 March 1984, by American astronomer Edward Bowell at the Anderson Mesa Station near Tucson, Arizona. It was named for American planetary scientist Lucy-Ann McFadden. The assumed S-type asteroid has a rotation period of 13.8 hours.

    3868 Mendoza, provisional designation 4575 P-L is a stony Vestian asteroid and binary system from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 24 September 1960, by astronomers Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar Observatory.

    1830 Pogson, provisional designation 1968 HA, is a stony Florian asteroid and an asynchronous binary system from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 17 April 1968, by Swiss astronomer Paul Wild at the Zimmerwald Observatory near Bern, Switzerland. The S-type asteroid has a rotation period 2.6 of hours. It was named for English astronomer Norman Pogson. The discovery of its 2.5-kilometer sized companion was announced in May 2007.

    1979 Sakharov, provisionally designated 2006 P-L, is a stony Vestian asteroid from the inner regions of the asteroid belt, approximately 4.5 kilometers in diameter. It was discovered during the Palomar–Leiden survey in 1960, and named after Russian physicist Andrei Sakharov.

    1405 Sibelius, provisional designation 1936 RE, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 12 September 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The asteroid was named after composer Jean Sibelius.

    2862 Vavilov, provisional designation 1977 JP, is a stony background asteroid and exceptionally slow rotator from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 15 May 1977, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. The asteroid was named after Russian plant geneticist Nikolai Vavilov and his physicist brother Sergey Ivanovich Vavilov.

    10208 Germanicus, provisional designation 1997 QN1, is a stony Florian asteroid and binary system from the inner regions of the asteroid belt, approximately 3.5 kilometers in diameter.

    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 2478 Tokai (1981 JC)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Archived from the original on 24 July 2020. Retrieved 18 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(2478) Tokai". Dictionary of Minor Planet Names – (2478) Tokai. Springer Berlin Heidelberg. p. 202. doi:10.1007/978-3-540-29925-7_2479. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 7 "LCDB Data for (2478) Tokai". Asteroid Lightcurve Database (LCDB). Retrieved 18 June 2017.
    4. 1 2 "Electronic Telegram No. 824". IAU Central Bureau for Astronomical Telegrams. 30 January 2007. Retrieved 5 July 2011.
    5. 1 2 Johnston, Robert (21 September 2014). "(2478) Tokai". johnstonsarchive.net. Retrieved 18 June 2017.
    6. 1 2 3 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 . Retrieved 18 June 2017.
    7. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv: 1509.02522 . Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117 . Retrieved 19 June 2017.
    8. 1 2 3 4 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)
    9. 1 2 3 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.
    10. 1 2 3 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 19 June 2017.
    11. ↑ Higgins, D.; Pravec, P.; Kusnirak, P.; Warner, B.; Galad, A.; Oey, J.; et al. (January 2007). "(2478) Tokai". Central Bureau Electronic Telegrams. 824 (824): 1. Bibcode:2007CBET..824....1H . Retrieved 19 June 2017.
    12. ↑ Oey, Julian (January 2016). "Lightcurve Analysis of Asteroids from Blue Mountains Observatory in 2014". The Minor Planet Bulletin. 43 (1): 45–51. Bibcode:2016MPBu...43...45O. ISSN   1052-8091 . Retrieved 19 June 2017.
    13. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv: 1506.00762 . Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007 . Retrieved 19 June 2017.
    14. ↑ "2478 Tokai (1981 JC)". Minor Planet Center. Retrieved 18 June 2017.
    15. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 June 2017.
    This page is based on this Wikipedia article
    Text is available under the CC BY-SA 4.0 license; additional terms may apply.
    Images, videos and audio are available under their respective licenses.