324 Bamberga

Last updated

324 Bamberga
Potw1749a Bamberga crop.png
VLT image of Bamberga
Discovery
Discovered by Johann Palisa
Discovery date25 February 1892
Designations
(324) Bamberga
Pronunciation /bæmˈbɜːrɡə/
Named after
 Bamberg
Main belt
Adjectives Bambergian /bæmˈbɜːrdʒiən,-ɡiən/
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 124.08 yr (45321 d)
Aphelion 3.59442  AU (537.718  Gm)
Perihelion 1.77023 AU (264.823 Gm)
2.68232 AU (401.269 Gm)
Eccentricity 0.34004
4.39 yr (1604.6 d)
225.419°
0° 13m 27.682s / day
Inclination 11.1011°
327.883°
44.2409°
Physical characteristics
Dimensionsc/a = 0.96±0.05 [2]
Mean diameter
227±3 km [2]
234.67 ± 7.80 km [3]
229.4 ± 7.4 km (IRAS) [4]
Mass (10.2±0.9)×1018 kg [2]
11×1018 kg [5]
(10.3±1.0)×1018 kg [3]
Mean density
1.67±0.16 g/cm3 [2]
1.52±0.20 g/cm3 [3]
1.226 d [6]
29.43  h (1.226  d) [1]
0.060 (calculated) [2]
0.0628±0.004 [4]
C-type asteroid [7]
6.82 [1] [4]

    Bamberga (minor planet designation: 324 Bamberga) is one of the largest asteroids in the asteroid belt. It was discovered by Johann Palisa on 25 February 1892 in Vienna. It is one of the top-20 largest asteroids in the asteroid belt. Apart from the near-Earth asteroid Eros, it was the last asteroid which is ever easily visible with binoculars to be discovered.

    Contents

    Overall Bamberga is the tenth-brightest main-belt asteroid after, in order, Vesta, Pallas, Ceres, Iris, Hebe, Juno, Melpomene, Eunomia and Flora. Its high eccentricity (for comparison 36% higher than that of Pluto), though, means that at most oppositions other asteroids reach higher magnitudes.

    Observation

    Bamberga's orbit 324 Bamberga.gif
    Bamberga's orbit

    Although its very high orbital eccentricity means its opposition magnitude varies greatly, at a rare opposition near perihelion Bamberga can reach a magnitude of +8.0, [8] which is as bright as Saturn's moon Titan. Such near-perihelion oppositions occur on a regular cycle every twenty-two years, with the last occurring in 2013 and the next in 2035, when attaining magnitude 8.1 on 13 September. Its brightness at these rare near-perihelion oppositions makes Bamberga the brightest C-type asteroid, roughly one magnitude brighter than 10 Hygiea's maximum brightness of around +9.1. At such an opposition Bamberga can in fact be closer to Earth than any main-belt asteroid with magnitude above +9.5, getting as close as 0.78 AU. For comparison, 7 Iris never comes closer than 0.85 AU and 4 Vesta never closer than 1.13 AU (when it becomes visible to the naked eye in a light pollution-free sky).

    Characteristics

    The 29-hour rotation period is unusually long for an asteroid more than 150 km in diameter. [9] Its spectral class is intermediate between the C-type and P-type asteroids. [7]

    10μ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 255 km. [10] An occultation of Bamberga was observed on 8 December 1987, and gave a diameter of about 228 km, in agreement with IRAS results. In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty. [11]

    Related Research Articles

    <span class="mw-page-title-main">2 Pallas</span> Third-largest asteroid

    Pallas is the second asteroid to have been discovered, after Ceres. Like Ceres, it is believed to have a mineral composition similar to carbonaceous chondrite meteorites, though significantly less hydrated than Ceres. It is the third-largest asteroid in the Solar System by both volume and mass, and is a likely remnant protoplanet. It is 79% the mass of Vesta and 22% the mass of Ceres, constituting an estimated 7% of the mass of the asteroid belt. Its estimated volume is equivalent to a sphere 507 to 515 kilometers in diameter, 90–95% the volume of Vesta.

    <span class="mw-page-title-main">3 Juno</span> Asteroid in the asteroid belt

    3 Juno is a large asteroid in the asteroid belt. Juno was the third asteroid discovered, in 1804, by German astronomer Karl Harding. It is one of the twenty largest asteroids and one of the two largest stony (S-type) asteroids, along with 15 Eunomia. It is estimated to contain 1% of the total mass of the asteroid belt.

    <span class="mw-page-title-main">5 Astraea</span> Large asteroid

    Astraea is an asteroid in the asteroid belt. Its surface is highly reflective and its composition is probably a mixture of nickel–iron with silicates of magnesium and iron. It is an S-type asteroid in the Tholen classification system.

    <span class="mw-page-title-main">18 Melpomene</span> Main-belt asteroid

    Melpomene is a large, bright main-belt asteroid that was discovered by J. R. Hind on 24 June 1852, and named after Melpomenē, the Muse of tragedy in Greek mythology. Its historical symbol was a dagger over a star; it is in the pipeline for Unicode 17.0 as U+1CECB 𜻋.

    Herodias is a carbonaceous asteroid from the central regions of the asteroid belt, approximately 66 kilometers in diameter. It is an identified Eunomian interloper. It was named after the biblical character Herodias.

    716 Berkeley is a background asteroid from the central regions of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 30 July 1911. The stony S-type asteroid has a rotation period of 15.6 hours and measures approximately 21 kilometers in diameter. It was named after the city of Berkeley, California, where the discoverer's colleague Armin Otto Leuschner (1868–1953) was the director of the local observatory.

    717 Wisibada is a dark background asteroid from the outer regions of the asteroid belt. It was discovered on 26 August 1911, by German astronomer Franz Kaiser at the Heidelberg-Königstuhl State Observatory in southwest Germany. The D-type asteroid measures approximately 29 kilometers in diameter with no rotation period yet determined. It was named after the discoverer's birthplace, the city of Wiesbaden in Hesse, Germany.

    735 Marghanna is a large carbonaceous background asteroid from the central regions of the asteroid belt, approximately 74 kilometers in diameter. It was discovered on 9 December 1912, by German astronomer Heinrich Vogt at the Heidelberg-Königstuhl State Observatory in southwest Germany. The dark C-type asteroid (Ch) has a rotation period of 20.6 hours and is rather regular in shape. It was named after Margarete Vogt and after Hanna, the mother and a relative of the discoverer, respectively.

    736 Harvard is a stony background asteroid from the inner regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 16 November 1912, by American astronomer Joel Hastings Metcalf at the Winchester Observatory. The bright S-type asteroid has a rotation period of 6.7 hours. It was named after Harvard University in Cambridge, Massachusetts.

    779 Nina is a large background asteroid, approximately 80 kilometers in diameter, located in the central region of the asteroid belt. It was discovered on 25 January 1914, by Russian astronomer Grigory Neujmin(1886-1946) at the Simeiz Observatory on the Crimean peninsula. The metallic X-type asteroid with an intermediate albedo has a rotation period of 11.2 hours. It was named after the discoverer's sister, Nina Neujmina (Tsentilovich) (1889–1971).

    783 Nora is a dark background asteroid from the inner regions of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 18 March 1914. The carbonaceous C-type asteroid has a longer-than average rotation period of 55.5 hours and measures approximately 40 kilometers in diameter. It was likely named after Nora Helmer, principal character in the play A Doll's House by Norwegian poet Henrik Ibsen.

    786 Bredichina is a carbonaceous and very large background asteroid, approximately 104 kilometers in diameter, located in the outer region of the asteroid belt. It was discovered by German astronomer Franz Kaiser at the Heidelberg-Königstuhl State Observatory on 20 April 1914. The elongated C-type asteroid has a longer than average rotation period of 29.4 hours. It was named after Russian astronomer Fyodor Bredikhin (1831–1904).

    794 Irenaea is a dark background asteroid from the outer regions of the asteroid belt. It was discovered on 27 August 1914, by Austrian astronomer Johann Palisa at the Vienna Observatory. The presumed C-type asteroid has a rotation period of 9.1 hours and measures approximately 36 kilometers in diameter. It was likely named after Irene Hillebrand, daughter of Austrian astronomer Edmund Weiss (1837–1917).

    813 Baumeia is a stony background asteroid from the inner regions of the asteroid belt. It was discovered on 28 November 1915, by German astronomer Max Wolf at the Heidelberg Observatory in southwest Germany. The common S-type asteroid has a rotation period of 10.5 hours and measures approximately 12 kilometers in diameter. It was named for H. Baum, a German student of astronomy at Heidelberg who was killed in World War I.

    (35671) 1998 SN165, prov. designation: 1998 SN165, is a trans-Neptunian object from the Kuiper belt located in the outermost region of the Solar System. It was discovered on 23 September 1998, by American astronomer Arianna Gleason at the Kitt Peak National Observatory near Tucson, Arizona. The cold classical Kuiper belt object is a dwarf planet candidate, as it measures approximately 400 kilometers (250 miles) in diameter. It has a grey-blue color (BB) and a rotation period of 8.8 hours. As of 2021, it has not been named.

    1268 Libya, provisional designation 1930 HJ, is a dark Hildian asteroid from the outer regions of the asteroid belt, approximately 95 kilometers in diameter. It was discovered on 29 April 1930, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg, South Africa. The asteroid was named for the country Libya.

    4585 Ainonai is a dark Chloris asteroid, approximately 11 kilometers in diameter, located in the central region of the asteroid belt. It was discovered on 16 May 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory in eastern Hokkaidō, Japan. The presumed carbonaceous C-type asteroid has a longer than average rotation period of 38.3 hours. It was named for the Japanese town of Ainonai, located near the discovering observatory.

    9344 Klopstock, provisional designation 1991 RB4, is a background asteroid from the inner regions of the asteroid belt. It was discovered on 12 September 1991, by German astronomers Freimut Börngen and Lutz Schmadel at the Karl Schwarzschild Observatory in Tautenburg, Germany. Poor observational data suggests that the asteroid is one of the darkest known objects with a diameter of approximately 17 kilometers (11 miles), while it is also an assumed stony asteroid with a much smaller diameter. It has a rotation period of 5.84 hours and was named after German poet Friedrich Gottlieb Klopstock.

    5641 McCleese, provisional designation 1990 DJ, is a rare-type Hungaria asteroid and slow rotator, classified as Mars-crosser from the innermost regions of the asteroid belt, approximately 4 kilometers in diameter.

    6189 Völk (prov. designation:1989 EY2) is a stony Vesta asteroid, approximately 4 kilometers (2.5 miles) in diameter, located in the inner regions of the asteroid belt. It was discovered on 2 March 1989, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile. The S-type asteroid has a short rotation period of 2.9 hours. It was named for Elisabeth Völk, a staff member at ESO headquarters in Germany.

    References

    1. 1 2 3 "JPL Small-Body Database Browser: 324 Bamberga". 2008-07-26 last obs. Retrieved 11 May 2016.
    2. 1 2 3 4 5 P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
    3. 1 2 3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv: 1203.4336 , Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    4. 1 2 3 Tedesco, E.F.; Noah, P.V.; Noah, M.; Price, S.D. (2004). "IRAS Minor Planet Survey. IRAS-A-FPA-3-RDR-IMPS-V6.0". NASA Planetary Data System. Archived from the original on 17 January 2010. Retrieved 15 March 2007.
    5. ↑ Pitjeva, E. V. (2005). "High-Precision Ephemerides of Planets—EPM and Determination of Some Astronomical Constants" (PDF). Solar System Research. 39 (3): 176. Bibcode:2005SoSyR..39..176P. doi:10.1007/s11208-005-0033-2. Archived from the original (PDF) on 31 October 2008.
    6. ↑ Harris, A. W.; Warner, B.D.; Pravec, P., eds. (2006). "Asteroid Lightcurve Derived Data. EAR-A-5-DDR-DERIVED-LIGHTCURVE-V8.0". NASA Planetary Data System. Archived from the original on 28 January 2007. Retrieved 15 March 2007.
    7. 1 2 Neese, C., ed. (2005). "Asteroid Taxonomy.EAR-A-5-DDR-TAXONOMY-V5.0". NASA Planetary Data System. Archived from the original on 10 March 2007. Retrieved 15 March 2007.
    8. ↑ Donald H. Menzel & Jay M. Pasachoff (1983). A Field Guide to the Stars and Planets (2nd ed.). Boston, MA: Houghton Mifflin. p.  391. ISBN   0-395-34835-8.
    9. ↑ "JPL Small-Body Database Search Engine: diameter > 150 (km) and rot_per > 24 (h)". JPL Solar System Dynamics . Retrieved 6 June 2015.
    10. ↑ Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal, vol. 204, pp. 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469.
    11. ↑ Gradie, J.; Flynn, L. (March 1988), "A Search for Satellites and Dust Belts Around Asteroids: Negative Results", Abstracts of the Lunar and Planetary Science Conference, vol. 19, pp. 405–406, Bibcode:1988LPI....19..405G.
    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.