Nysa Asteroids
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Home > Art, Film & Photography > Nysa Asteroids: 135 Hertha
Nysa Asteroids: 135 Hertha

Nysa Asteroids: 135 Hertha


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About the Book

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: 135 Hertha is a large main belt asteroid. It orbits among the Nysa asteroid family however its classification as an M-type asteroid does not match the more common F-type asteroid for this clan, suggesting that it may be an interloper. Spectroscopic analysis indicates the possible presence of hydrated silicates indicating that 135 Hertha should possibly be reclassified from its present M-type to the proposed W-type. Lightcurve data from Hertha indicates a flattened body, and radar observations indicate that Hertha is non-metallic. One occultation of a star by the asteroid has been observed, in 2000. Hertha was discovered by C. H. F. Peters on February 18, 1874 in Clinton, New York. Further observations were carried out in 1883 by W. T. Sampson and communicated to Astronomische Nachrichten on his behalf by Rear Admiral R. W. Shufeldt. After its discovery in 1874 and subsequent observations in 1884 had established Hertha's orbit, astronomers began investigation of its physical properties. As early as 1904 G. W. Hill reported observations of Hertha's brightness indicating a variation of half a magnitude and a short period. In October 1992 Dotto et al. performed 20 hours of observations spread over 6 nights to investigate 135 Hertha's rotational period, approximate shape, and the coordinates of its rotational axis. They were able to confirm a rotational period of 8.398 .001 hours as previously measured by Harris et al. published earlier in 1992. In the same study, Dotto et al. measured the asteroid's shape and rotational axis. The axes ratios were found to be: a/b = 1.34 .03 and b/c = 1.22 .05. Two possible values were determined for the rotational axis, however further measurements at different ecliptic longitudes are required to determine ... More: http: //booksllc.net/?id=741544


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Product Details
  • ISBN-13: 9781156456361
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 46
  • Spine Width: 3 mm
  • Weight: 82 gr
  • ISBN-10: 1156456363
  • Publisher Date: 31 May 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: 135 Hertha
  • Width: 229 mm


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