| 词条 | 19 Fortuna |
| 释义 |
| minorplanet = yes | background=#D6D6D6 | name=19 Fortuna | symbol= | image = 19Fortuna-LB1-crab-mag11.jpg | image_size = 180 | caption = Fortuna centered above the Crab Nebula | discoverer=John Russell Hind | discovered=August 22, 1852 | mpc_name=(19) Fortuna | alt_names=A902 UG | pronounced = {{IPAc-en|f|ɔr|ˈ|tj|uː|n|ə}} | named_after = Fortūna | mp_category=Main belt | orbit_ref =[1] | epoch=October 22, 2004 (JD 2453300.5) | semimajor=2.441 AU (365.235 Gm) | perihelion=2.052 AU (307.028 Gm) | aphelion=2.831 AU (423.443 Gm) | eccentricity=0.159 | period=3.81 a (1393.378 d) | inclination=1.573° | asc_node=211.379° | arg_peri=182.091° | mean_anomaly=268.398° | avg_speed=18.94 km/s | dimensions=(225×205×195)±12 km[2] 225 km[2][4] | mass=1.27{{e|19}} kg[3] | density=2.70±0.48 g/cm³[3] | surface_grav=~0.0629 m/s² | escape_velocity=~0.1190 km/s | rotation=0.3101 d (7.4432 h)[1] | spectral_type=G[1] | magnitude = 8.88[4] to 12.95 | abs_magnitude=7.13[1] | albedo=0.037[1] | angular_size = 0.25" to 0.072" | single_temperature=~180 K }} Fortuna (minor planet designation: 19 Fortuna) is one of the largest main-belt asteroids. It has a composition similar to 1 Ceres: a darkly colored surface that is heavily space-weathered with the composition of primitive organic compounds, including tholins. Fortuna is 225 km in diameter and has one of the darkest known geometric albedos for an asteroid over 150 km in diameter. Its albedo has been measured at 0.028 and 0.037.[5] The spectra of the asteroid displays evidence of aqueous alteration.[6] The Hubble Space Telescope observed Fortuna in 1993. It was resolved with an apparent diameter of 0.20 arcseconds (4.5 pixels in the Planetary Camera) and its shape was found to be nearly spherical. Satellites were searched for but none were detected. Stellar occultations by Fortuna have been observed several times. Fortuna has been studied by radar.[7]It was discovered by J. R. Hind on August 22, 1852, and named after Fortuna, the Roman goddess of luck. Fortuna has been perturbed by the 80 km 135 Hertha and was initially estimated by Baer to have a mass of 1.08{{e|19}} kg.[8] A more recent estimate by Baer suggests it has a mass of 1.27{{e|19}} kg.[3] On December 21, 2012 Fortuna (~200 km) harmlessly passed within 6.5Gm of asteroid 687 Tinette.[9] References1. ^1 2 3 4 {{cite web |type=2008-08-21 last obs |title=JPL Small-Body Database Browser: 19 Fortuna |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=19 |accessdate=2008-11-11}} 2. ^{{cite journal |last = Storrs |first = Alex |author2 = Weiss, B. |author3 = Zellner, B. |title = Imaging Observations of Asteroids with Hubble Space Telescope |journal = Icarus |volume = 137 |pages = 260–268 |date = 1998 |url = http://scripts.mit.edu/~paleomag/articles/Storrs_1999_Icarus.pdf |accessdate = 2005-01-15 |doi = 10.1006/icar.1999.6047 |bibcode = 1999Icar..137..260S |issue = 2 |display-authors = etal |deadurl = yes |archiveurl = https://web.archive.org/web/20120225134811/http://scripts.mit.edu/~paleomag/articles/Storrs_1999_Icarus.pdf |archivedate = February 25, 2012 |df = mdy-all}} 3. ^1 2 3 {{cite web|date=2008|title=Recent Asteroid Mass Determinations|publisher=Personal Website|author=Jim Baer|url=http://home.earthlink.net/~jimbaer1/astmass.txt|accessdate=2008-11-27}} 4. ^{{cite web |title=AstDys (19) Fortuna Ephemerides |publisher=Department of Mathematics, University of Pisa, Italy |url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.1&n=19&oc=500&y0=1963&m0=10&d0=31&h0=0&mi0=0&y1=1963&m1=10&d1=31&h1=0&mi1=0&ti=1.0&tiu=days |accessdate=2010-06-27}} 5. ^{{cite journal|last=Storrs |first=Alex|author2=Dunne|author3=Conan|author4=Mugnier|title=A closer look at main belt asteroids 1: WF/PC images|journal=Icarus|volume=173 |issue=2 |pages=409–416 |date=2005|doi=10.1016/j.icarus.2004.08.007|url=http://web.mit.edu/bpweiss/www/StorrsWeiss2005AsteroidsHSTIcarus.pdf|accessdate=2007-09-23|archiveurl = https://web.archive.org/web/20070418034343/http://web.mit.edu/bpweiss/www/StorrsWeiss2005AsteroidsHSTIcarus.pdf |archivedate = April 18, 2007 |bibcode=2005Icar..173..409S|display-authors=etal}} 6. ^{{citation | title=Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites | display-authors=1 | postscript=. | last1=Fornasier | first1=S. | last2=Lazzarin | first2=M. | last3=Barbieri | first3=C. | last4=Barucci | first4=M. A. | journal=Astronomy and Astrophysics Supplement | volume=135 | pages=65−73 | date=February 1999 | doi=10.1051/aas:1999161 | bibcode=1999A&AS..135...65F }} 7. ^{{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}} 8. ^1 {{cite journal|last=Baer |first=James |authorlink=James Baer|author2=Steven R. Chesley|author2-link=Steven R. Chesley|title=Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris|journal=Celestial Mechanics and Dynamical Astronomy|volume=100 |issue=2008 |pages=27–42|publisher=Springer Science+Business Media B.V. 2007|url=http://www.springerlink.com/content/h747307j43863228/fulltext.pdf|format=PDF|doi=10.1007/s10569-007-9103-8|accessdate=2008-11-11|date=2008 |bibcode = 2008CeMDA.100...27B }} 9. ^Generated with Solex 10 {{webarchive|url=https://www.webcitation.org/5gOzK38bc?url=http://chemistry.unina.it/~alvitagl/solex/ |date=April 29, 2009 }} by Aldo Vitagliano External links
7 : Background asteroids|Discoveries by John Hind|Minor planets named from Roman mythology|Named minor planets|G-type asteroids (Tholen)|Ch-type asteroids (SMASS)|Astronomical objects discovered in 1852 |
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