3430 Bradfield

Last updated

3430 Bradfield
003430-asteroid shape model (3430) Bradfield.png
Shape model of Bradfield from its lightcurve
Discovery [1]
Discovered by C. Shoemaker
Discovery site Palomar Obs.
Discovery date9 October 1980
Designations
(3430) Bradfield
Named after
William A. Bradfield
(discoverer of comets)
1980 TF4 ·1974 HY1
1976 YS7
main-belt [1] [2]  ·(middle)
Agnia [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 43.93 yr (16,044 d)
Aphelion 3.0293 AU
Perihelion 2.4890 AU
2.7592 AU
Eccentricity 0.0979
4.58 yr (1,674 d)
102.11°
0° 12m 54s / day
Inclination 4.4281°
43.225°
278.60°
Physical characteristics
8.492±0.263  km [4]
0.269±0.035 [4]
SMASS = S q [2]
12.5 [1] [2]

    3430 Bradfield (prov. designation: 1980 TF4) is a stony Agnia asteroid from the central regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 9 October 1980, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The S q-type asteroid was named after comet hunter William A. Bradfield. [1]

    Contents

    Orbit and classification

    When applying the hierarchical clustering method to its proper orbital elements according to Nesvorný, Bradfield is a member of the Agnia family ( 514 ), [3] a very large family of stony asteroids with more than 2000 known members. [5] They most likely formed from the breakup of a basalt object, which in turn was spawned from a larger parent body that underwent igneous differentiation. [6] The family's parent body and namesake is the asteroid 847 Agnia. [5] In the 1995-HCM analysis by Zappalà, however, it is a member of the Liberatrix family (also described as Nemesis family by Nesvorný). [3] [7]

    It orbits the Sun in the central main-belt at a distance of 2.5–3.0  AU once every 4 years and 7 months (1,674 days; semi-major axis of 2.76 AU). Its orbit has an eccentricity of 0.10 and an inclination of 4° with respect to the ecliptic. [2] The body's observation arc begins with its observations as 1974 HY1 at Cerro El Roble Observatory in April 1974, more than 6 years prior to its official discovery observation at Palomar. [1]

    Naming

    This minor planet was named after New Zealand-born Australian amateur astronomer and rocket engineer William A. Bradfield (1927–2014). A discoverer of several comets himself, he significantly increased the rate of discovery of bright comets from the southern hemisphere during the 1970s and 1980s. [1] The official naming citation was published by the Minor Planet Center on 14 April 1987 ( M.P.C. 11750). [8]

    Physical characteristics

    In the SMASS classification, Bradfield is an Sq-subtype, that transitions between the common, stony S-type and Q-type asteroids. [2]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Bradfield measures 8.492 kilometers in diameter and its surface has an albedo of 0.269. [4]

    Rotation period

    As of 2018, no rotational lightcurve of Bradfield has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. [2]

    Related Research Articles

    763 Cupido is a Flora asteroid, tumbler and slow rotator from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 25 September 1913, by German astronomer Franz Kaiser at the Heidelberg-Königstuhl State Observatory in southwest Germany. The S/L-type asteroid has an exceptionally long rotation period of 151 hours. It was named by its Latin name after Cupid, the Roman god of erotic love, attraction and affection.

    <span class="mw-page-title-main">810 Atossa</span> Main-belt asteroid

    810 Atossa is a bright and elongated background asteroid from the region of the Flora family, located in the inner portion of the asteroid belt. It was discovered on 8 September 1915, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southern Germany. The presumed S-type asteroid has a rotation period of 4.4 hours and measures approximately 8 kilometers in diameter. It was named after the ancient Persian queen Atossa.

    1020 Arcadia, provisional designation 1924 QV, is a stony Agnia asteroid from the central regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 7 March 1924, by German astronomer Karl Reinmuth at the Heidelberg Observatory in Heidelberg, Germany. The asteroid was named after the Greek region of Arcadia.

    <span class="mw-page-title-main">1058 Grubba</span>

    1058 Grubba, provisional designation 1925 MA, is a stony Flora asteroid from the inner regions of the asteroid belt. It was discovered on 22 June 1925, by Soviet–Russian astronomer Grigory Shajn at the Simeiz Observatory on the Crimean peninsula. The S-type asteroid was named for Irish telescope maker Howard Grubb. It has a longer-than average rotation period of 46.30 hours and measures approximately 12 kilometers in diameter.

    2531 Cambridge, provisional designation 1980 LD, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 11 June 1980, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Arizona, United States. The asteroid was named for the "centers of learning in England and in Massachusetts".

    7803 Adachi, provisional designation 1997 EW2, is a stony Agnia asteroid from the middle region of the asteroid belt, approximately 6.4 kilometers (4 miles) in diameter. The asteroid was discovered on 4 March 1997, by Japanese amateur astronomer Takao Kobayashi at the Ōizumi Observatory in central Japan. It was named for Japanese amateur astronomer Makoto Adachi. The S-type asteroid has a rotation period of 5.2 hours.

    <span class="mw-page-title-main">5196 Bustelli</span>

    5196 Bustelli is a stony Eunomia asteroid from the central regions of the asteroid belt, approximately 6 kilometers kilometers in diameter. It was discovered on 30 September 1973, by Dutch astronomers Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels the Palomar Observatory. The S-type asteroid was named after Italian-Swiss artist Franz Anton Bustelli.

    2325 Chernykh, provisional designation 1979 SP, is a dark Themistian asteroid from the outer regions of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 25 September 1979, by Czech astronomer Antonín Mrkos at the Klet Observatory in the Czech Republic. The asteroid was named after Russian astronomer couple Lyudmila Chernykh and Nikolai Chernykh.

    <span class="mw-page-title-main">1419 Danzig</span> Flora asteroid

    1419 Danzig is a highly elongated Flora asteroid from the inner regions of the asteroid belt. It was discovered on 5 September 1929, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. The stony S-type asteroid has a rotation period of 8.1 hours and measures approximately 14 kilometers in diameter. It was named for the city of Gdańsk.

    3031 Houston, provisional designation 1984 CX, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 8 February 1984, by American astronomer Edward Bowell at Anderson Mesa Station near Flagstaff, Arizona. It was named after American amateur astronomer Walter Scott Houston.

    1532 Inari, provisional designation 1938 SM, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 28 kilometers in diameter. Discovered by Yrjö Väisälä at Turku Observatory in 1938, it was later named for Lake Inari in northern Finland.

    10245 Inselsberg, provisional designation 6071 P-L, is a Gefion asteroid from the central regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 24 September 1960, by Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at Palomar Observatory in California, United States. The likely S-type asteroid was named for the German mountain Großer Inselsberg.

    <span class="mw-page-title-main">6546 Kaye</span> Main-belt asteroid

    6546 Kaye (prov. designation: 1987 DY4) is a dark and elongated background asteroid from the outer region of the asteroid belt. It was discovered on 24 February 1987, by Czech astronomer Antonín Mrkos at the South Bohemian Kleť Observatory in the Czech Republic. The presumed C-type asteroid has a rotation period of 10.0 hours and measures approximately 22 kilometers (14 miles) in diameter. It was named for American actor Danny Kaye.

    2726 Kotelnikov, provisional designation 1979 SE9, is a stony Koronian asteroid from the outer regions of the asteroid belt, approximately 10 kilometers (6.2 miles) in diameter. It was discovered on 22 September 1979, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij on the Crimean peninsula. The S-type asteroid has a rotation period of 4.91 hours and is a suspected binary system. The asteroid was named for Soviet scientist and pioneer in radar astronomy, Vladimir Kotelnikov.

    1990 Pilcher, provisional designation 1956 EE, is a stony background asteroid from the Florian region of the inner asteroid belt, approximately 7 kilometers in diameter. It was discovered on 9 March 1956, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Heidelberg, Germany. In 1982, it was named by the MPC for American physicist and photometrist Frederick Pilcher. The S-type asteroid has a short rotation period of 2.8 hours.

    <span class="mw-page-title-main">5208 Royer</span> Asteroid

    5208 Royer (prov. designation: 1989 CH1) is a stony Marian asteroid from the central regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 6 February 1989, by astronomer Eleanor Helin at the Palomar Observatory. The S-type asteroid has a rotation period of 3.87 hours and was named after American priest and amateur astronomer, Ronald Royer.

    16525 Shumarinaiko (provisional designation 1991 CU2) is a stony Nysian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 14 February 1991, by Japanese astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory on the island of Hokkaidō in northern Japan. The asteroid was named after the Japanese Lake Shumarinai. Its sub-kilometer sized minor-planet moon was discovered in 2013.

    2554 Skiff, provisional designation 1980 OB, is a Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 17 July 1980, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona. The presumed S-type asteroid has a rotation period of 25.6 hours and was named after astronomer Brian Skiff.

    4085 Weir, provisional designation 1985 JR, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 13 May 1985, by astronomer Carolyn Shoemaker at the Palomar Observatory in California, United States. The asteroid was named after American geologist Doris Blackman Weir.

    23327 Luchernandez (provisional designation 2001 BE31) is a Florian asteroid from the inner regions of the asteroid belt, approximately 2 kilometers in diameter. It was discovered on 20 January 2001, by astronomers of the LINEAR program at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, United States. The asteroid was named for ISEF awardee Lucero Hernandez.

    References

    1. 1 2 3 4 5 6 "3430 Bradfield (1980 TF4)". Minor Planet Center. Retrieved 12 April 2018.
    2. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 3430 Bradfield (1980 TF4)" (2018-03-28 last obs.). Jet Propulsion Laboratory . Retrieved 12 April 2018.
    3. 1 2 3 "Asteroid 3430 Bradfield – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    4. 1 2 3 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.
    5. 1 2 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.
    6. Sunshine, Jessica M.; Bus, Schelte J.; McCoy, Timothy J.; Burbine, Thomas H.; Corrigan, Catherine M.; Binzel, Richard P. (August 2004). "High-calcium pyroxene as an indicator of igneous differentiation in asteroids and meteorites". Meteoritics and Planetary Science. 39 (8): 1343–1357. Bibcode:2004M&PS...39.1343S. doi: 10.1111/j.1945-5100.2004.tb00950.x . Retrieved 12 April 2018.
    7. 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 19 March 2020.} (PDS main page)
    8. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 April 2018.