| 词条 | 33 Polyhymnia |
| 释义 |
| minorplanet = yes | background = #D6D6D6 | name = 33 Polyhymnia | discovery_ref= | discoverer = J. Chacornac | discovered = October 28, 1854 | mpc_name = (33) Polyhymnia | alt_names = A887 HA; 1938 FE; 1953 AK; 1957 YL; 1963 DG; {{mp|1976 YT|7}} | pronounced = {{IPAc-en|p|ɒ|l|i|ˈ|h|ɪ|m|n|i|ə}} {{Respell|pol-ee|HIM|nee-ə}} | named_after = Polyhymnia | mp_category = Main belt | orbit_ref = [2] | epoch = April 18, 2013 (JD 2456400.5) | semimajor = {{Convert|2.86745|AU|Gm|abbr=on|sigfig=6|disp=flip}} | perihelion = {{Convert|1.90116|AU|Gm|abbr=on|sigfig=6|disp=flip}} | aphelion = {{Convert|3.83373|AU|Gm|abbr=on|sigfig=6|disp=flip|lk=in}} | eccentricity = 0.33698 | period = {{Convert|1773.541|day|year|sigfig=3|abbr=on|lk=out}} | inclination = 1.869° | asc_node = 8.595° | arg_peri = 338.123° | mean_anomaly = 256.476° | dimensions = {{val|62|11}} km[3] 50–120 km[1] {{val|53.98|0.91}} km[5] | mass = {{val|6.20|0.74|e=18|ul=kg}}[5] | density = | rotation = {{Convert|18.608|hour|day|abbr=on}}[7] | spectral_type= S[2] | abs_magnitude= 8.55[2] | albedo = }} Polyhymnia (minor planet designation: 33 Polyhymnia) is a main belt asteroid that was discovered by French astronomer Jean Chacornac on October 28, 1854 and named after Polyhymnia, the Greek Muse of sacred hymns. Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2008 gave a light curve with a period of 18.609 ± 0.002 hours and a brightness variation of 0.15 ± 0.02 in magnitude. This result is in good agreement with a previous study performed during 1980.[11] These results were re-examined with additional observations in 2011, yielding a refined estimate of 18.608 ± 0.001 hours and a brightness variation of 0.18 ± 0.02 magnitude.[7]Due to its high eccentricity (0.338), one of the highest for a lower numbered minor planet, on rare close approaches it can reach tenth magnitude, as on September 8, 2014 when it will be apparent magnitude 9.9 and 0.894 AU from Earth.[13] The orbit of 33 Polyhymnia puts it in a 22:9 mean motion resonance with the planet Jupiter. The computed Lyapunov time for this asteroid is 10,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets.[14] Measurements of the position for this asteroid from 1854 to 1969 were used to determination the gravitational influence of Jupiter upon 33 Polyhymnia. This yields an inverse mass ratio of 1,047.341 ± 0.011 for Jupiter relative to the sun.[15] Polyhymnia has been studied by radar.[16] References1. ^Conversion of Absolute Magnitude to Diameter {{webarchive |url=https://www.webcitation.org/5PqnLpqTT?url=http://cfa-www.harvard.edu/iau/lists/Sizes.html |date=2007-06-25 }} [2][3][4][5][6][7][8][9][10]2. ^1 2 3 {{cite web | first1 = Donald K. | last1 = Yeomans | title = 33 Polyhymnia | work = JPL Small-Body Database Browser | publisher = NASA Jet Propulsion Laboratory | url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=33 | accessdate= 2013-04-07 | postscript= .}} 3. ^1 {{cite web | title=AstDyS (33) Polyhymnia Ephemerides for 8 Sept 2014 | publisher=AstDyS-2 (Asteroids - Dynamic Site) | url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.1&n=33&oc=500&y0=2014&m0=09&d0=01&h0=0&mi0=0&y1=2014&m1=09&d1=20&h1=0&mi1=0&ti=1&tiu=days | accessdate=2012-01-23}} 4. ^1 {{citation |display-authors = 1 |last1 = Magri |first1 = C. |last2 = Ostro |first2 = S. J. |last3 = Rosema |first3 = K. D. |last4 = Thomas |first4 = M. L. |last5 = Mitchell |first5 = D. L. |last6 = Campbell |first6 = D. B. |last7 = Chandler |first7 = J. F. |last8 = Shapiro |first8 = I. |last9 = Giorgini |first9 = J. D. |title = Mainbelt Asteroids: Results of Arecibo and Goldstone Radar Observations of 37 Objects During 1980-1995 |journal = Bulletin of the American Astronomical Society |volume = 30 |page = 1450 |date = December 1998 |bibcode = 1998DPS....30.5516M |url = http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/20186/1/98-1067.pdf |accessdate = 2011-07-26 |deadurl = yes |archiveurl = https://web.archive.org/web/20120415134055/http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/20186/1/98-1067.pdf |archivedate = 2012-04-15 |df = }} 5. ^1 {{cite web | title=Radar-Detected Asteroids and Comets | publisher=NASA/JPL Asteroid Radar Research | url=http://echo.jpl.nasa.gov/asteroids/ | accessdate=2011-10-30}} 6. ^1 2 {{Citation | first1 = B. | last1 = Carry | title = Density of asteroids | work = Planetary and Space Science | volume = 73 | pages = 98–118 |date=December 2012 | doi = 10.1016/j.pss.2012.03.009 | bibcode = 2012P&SS...73...98C | postscript= .|arxiv = 1203.4336 }} See Table 1. 7. ^1 {{Citation | last1 = Janiczek | first1 = P. M. | title = Jupiter's mass from its action on Polyhymnia | work = Bulletin of the Astronomical Society | volume = 2 | page = 247 | year = 1970 | bibcode = 1970BAAS....2S.247J | postscript= .}} 8. ^1 {{Citation | last1 = Pilcher | first1 = Frederick | title = Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna | work = The Minor Planet Bulletin | volume = 36 | issue = 1 | pages = 25–27 |date=January 2009 | bibcode = 2009MPBu...36...25P | postscript= .}} 9. ^1 2 {{Citation | last1 = Pilcher | first1 = Frederick | title = A Critical Re-Examination of the Rotation Period of 33 Polyhymnia | work = The Minor Planet Bulletin | volume = 38 | issue = 3 | pages = 130–131 |date=July 2011 | bibcode = 2011MPBu...38..130P | postscript= .}} 10. ^1 {{Citation | last1 = Šidlichovský | first1 = M. | editor1-first = J. | editor1-last = Svoren | editor2-first = E. M. | editor2-last = Pittich | editor3-first = H. | editor3-last = Rickman | title = Resonances and chaos in the asteroid belt | work = Evolution and source regions of asteroids and comets : proceedings of the 173rd colloquium of the International Astronomical Union, held in Tatranska Lomnica, Slovak Republic, August 24–28, 1998 | pages = 297–308 | year = 1999 | bibcode = 1999esra.conf..297S | postscript= .}} }} External links
7 : Background asteroids|Discoveries by Jean Chacornac|Minor planets named from Greek mythology|Named minor planets|S-type asteroids (Tholen)|Sq-type asteroids (SMASS)|Astronomical objects discovered in 1854 |
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