2815 Soma

Last updated

2815 Soma
Discovery  [1]
Discovered by E. Bowell
Discovery site Anderson Mesa Stn.
Discovery date15 September 1982
Designations
(2815) Soma
Pronunciation ⫽ˈsoʊmə⫽ [2]
Named after
 Soma cube
(mechanical puzzle) [3]
1982 RL ·1955 MH
1970 AC ·1974 DL
1979 XB1
main-belt  · Flora   [4]
Orbital characteristics   [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 61.77 yr (22,562 days)
Aphelion 2.6107 AU
Perihelion 1.8552 AU
2.2329 AU
Eccentricity 0.1692
3.34 yr (1,219 days)
168.50°
0° 17m 43.44s / day
Inclination 5.7042°
119.87°
237.53°
Known satellites 1 [4] [5] [6]
(Ds/Dp: 0.25±0.02)
(orbital period: 17.915 h)
Physical characteristics
Dimensions6.641±0.105 km [7]
7.067 km [8]
7.07 km (taken) [4]
7.158±0.088 km [9]
2.7327±0.0008 h [lower-alpha 1]
2.73325±0.00007 h [5]
0.2273 [8]
0.3207±0.0411 [9]
0.365±0.083 [7]
S   [4]
12.49±0.06(R) [lower-alpha 1]  ·12.53±0.02(R) [5]  ·12.6 [9]  ·12.7 [1]  ·12.92±0.16 [10]  ·12.98±0.078 [4] [8]

    2815 Soma, provisional designation 1982 RL, is a binary Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 15 September 1982, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Flagstaff, Arizona, in the United States . [11] It is named for the mechanical puzzle Soma cube. [3]

    Contents

    Orbit and classification

    Soma is a member of the Flora family, a large family of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.9–2.6  AU once every 3 years and 4 months (1,219 days). Its orbit has an eccentricity of 0.17 and an inclination of 6° with respect to the ecliptic. [1] It was first identified as 1955 MH at Goethe Link Observatory in 1955. The body's observation arc begins with 1970 AC at Crimea-Nauchnij, 12 years prior to its official discovery at Anderson Mesa. [11]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Soma measures 6.641 and 7.158 kilometers in diameter and its surface has an albedo of 0.365 and 0.3207, respectively. [7] [9] The Collaborative Asteroid Lightcurve Link adopts Peter Pravec's revised WISE-data, that is, an albedo of 0.2273 and a diameter of 7.067 kilometers with an absolute magnitude of 12.98. [4] [8]

    Moon and lightcurve

    Primary

    In November 2009, a rotational lightcurve of Soma was obtained from photometric observations by astronomers Petr Pravec, Donald Pray and Peter Kušnirák at Carbuncle Hill Observatory, Rhode Island, and Ondřejov Observatory, in the Czech Republic, respectively. Lightcurve analysis gave a rotation period of 2.7327 hours with a brightness variation of 0.08 magnitude, indicating that the body has a nearly spheroidal shape ( U=3- ). [lower-alpha 1] The body's spin rate is within the 2.2-to-20 hours range found for most asteroids, about half an hour longer than the so-called fast rotators.

    Secondary

    In March 2011, photometric observations revealed that Soma is a synchronous binary asteroid with a minor-planet moon orbiting it every 17.915 hours. The system has a secondary-to-primary mean-diameter ratio of 0.25, which means that satellite's diameter measures approximately 25% of that of Soma (the primary), and translate into a diameter of 1.75 kilometers. [5] The observations also gave a refined rotation period for Soma of 2.73325 hours and an amplitude of 0.07 magnitude ( U=n.a. ). The system has an absolute magnitude of 12.53, and a phase slope parameter (G) of 0.27. [5]

    Naming

    This minor planet was named for the Soma cube, following a proposal by Belgian astronomer Jean Meeus (also see 2213 Meeus). The Soma cube a dissection puzzle with seven pieces, invented by the Danish mathematician Piet Hein and popularized by American writer Martin Gardner (also see 2587 Gardner). [3] The approved naming citation was published by the Minor Planet Center on 10 September 1984 ( M.P.C. 9080). [12]

    Notes

    1. 1 2 3 Pravec (2009) web: lightcurve plot of (2815) Soma with rotation period 2.7327±0.0008 hours and a brightness amplitude of 0.08 magnitude. Quality Code of 3-. Summary figures at Collaborative Asteroid Lightcurve Link and data sheet from the Ondrejov Asteroid Photometry Project

    Related Research Articles

    9617 Grahamchapman, provisional designation 1993 FA5, is a binary Florian asteroid from the inner regions of the asteroid belt, approximately 2.8 kilometers in diameter.

    2006 Polonskaya (provisional designation: 1973 SB3) is a stony Flora asteroid and asynchronous binary system from the inner regions of the asteroid belt, approximately 5 kilometers (3.1 miles) in diameter. It was discovered on 22 September 1973, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula, and later named after Ukrainian astronomer Elena Kazimirtchak-Polonskaïa. Its one-kilometer-sized satellite was discovered by an international collaboration of astronomers in November 2005.

    3673 Levy, provisional designation 1985 QS, is a binary Flora asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 22 August 1985, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona, United States. The asteroid was named after Canadian astronomer David H. Levy.

    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.

    6084 Bascom, provisional designation 1985 CT, is a binary Phocaea asteroid from the inner regions of the asteroid belt, approximately 6.3 kilometers in diameter. It was discovered on 12 February 1985, by American astronomer couple Carolyn and Eugene Shoemaker at Palomar Observatory in California. It is named after American geologist Florence Bascom. Its satellite measures approximately 2.3 kilometers and has an orbital period of 43.51 hours.

    4029 Bridges, provisional designation 1982 KC1, is a stony asteroid and binary system from the middle regions of the asteroid belt, approximately 8 kilometers in diameter.

    <span class="mw-page-title-main">1338 Duponta</span> Stony Florian asteroid and synchronous binary system

    1338 Duponta, provisional designation 1934 XA, is a stony Florian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 7.8 kilometers in diameter.

    7225 Huntress, provisional designation 1983 BH, is a binary Florian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 22 January 1983, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Flagstaff, Arizona, United States. It is named after astrochemist Wesley Huntress.

    7088 Ishtar, provisional designation 1992 AA, is a synchronous binary asteroid and near-Earth object from the Amor group, approximately 1.3 kilometers in diameter. It was discovered on 1 January 1992, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The relatively bright asteroid with an unknown spectral type has a rotation period of 2.7 hours. In December 2005, a 330-meter sized satellite was discovered, orbiting its primary every 20.65 hours.

    4951 Iwamoto, provisional designation 1990 BM, is a stony, synchronous binary asteroid and slow rotator from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 21 January 1990, by Japanese astronomers Yoshikane Mizuno and Toshimasa Furuta at Kani Observatory in Japan.

    5905 Johnson, provisional designation 1989 CJ1, is a Hungaria asteroid and synchronous binary system from the innermost regions of the asteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 11 February 1989, by American astronomer Eleanor Helin at Palomar Observatory in California, United States. Its satellite measures approximately 1.6 km (1 mi) in diameter and orbits its primary every 21.8 hours. It was named after American astronomer and engineer Lindley N. Johnson.

    5481 Kiuchi, provisional designation 1990 CH, is a bright binary Vestian asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 15 February 1990, by Japanese astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory in Hokkaidō, Japan, and named after their colleague Tsuruhiko Kiuchi. The V-type asteroid has a rotation period of 3.6 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.

    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.

    4786 Tatianina, provisional designation 1985 PE2, is a bright background asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 3.4 kilometers (2.1 miles) in diameter. It was discovered on 13 August 1985, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. It was named after Tatiana Somova, a friend of the discoverer. The E-/Xc-subtype has a short rotation period of 2.9 hours. Its sub-kilometer minor-planet moon was discovered on 20 March 2006 and announced the following month.

    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, Japan. The asteroid was named after the city of Tōkai.

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

    5477 Holmes, provisional designation 1989 UH2, is a Hungaria asteroid and binary system from the innermost regions of the asteroid belt, approximately 3 kilometers (2 miles) in diameter. It was discovered on 27 October 1989, by American astronomer Eleanor Helin at the Palomar Observatory in California. The presumed E-type asteroid is likely spherical in shape and has a short rotation period of 2.99 hours. It was named for American amateur astronomer Robert Holmes. The discovery of its 1-kilometer-sized minor-planet moon was announced in November 2005.

    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.

    (15700) 1987 QD is a Mars-crossing asteroid and a binary candidate from inside the innermost region of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 24 August 1987, by American astronomer Stephen Singer-Brewster at the Palomar Observatory in California. The likely spherical X-type asteroid has a rotation period of 3.1 hours. The suspected presence of a kilometer-sized minor-planet moon was announced in November 2000.

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 2815 Soma (1982 RL)" (2017-03-30 last obs.). Jet Propulsion Laboratory . Retrieved 3 July 2017.
    2. ↑ "soma". Merriam-Webster.com Dictionary .
    3. 1 2 3 Schmadel, Lutz D. (2007). "(2815) Soma". Dictionary of Minor Planet Names – (2815) Soma. Springer Berlin Heidelberg. p. 231. doi:10.1007/978-3-540-29925-7_2816. ISBN   978-3-540-00238-3.
    4. 1 2 3 4 5 6 "LCDB Data for (2815) Soma". Asteroid Lightcurve Database (LCDB). Retrieved 23 March 2017.
    5. 1 2 3 4 5 Pollock, J.; Pravec, P.; Kusnirak, P.; Hornoch, K.; Chiorny, V.; Gajdos, S.; et al. (April 2011). "(2815) Soma". Central Bureau Electronic Telegrams. 2705 (2705): 1. Bibcode:2011CBET.2705....1P . Retrieved 23 March 2017.
    6. ↑ Johnston, Robert (21 September 2014). "(2815) Soma". johnstonsarchive.net. Retrieved 23 March 2017.
    7. 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 23 March 2017.
    8. 1 2 3 4 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 23 March 2017.
    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. ↑ 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 23 March 2017.
    11. 1 2 "2815 Soma (1982 RL)". Minor Planet Center. Retrieved 23 March 2017.
    12. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 23 March 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.