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  • Astrophysics  (1)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
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  • 1
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    The 2060 Chiron: CCD photometry (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: R-band CCD photometry of 2060 was carried out on nine nights in Nov. and Dec. 1986. The rotation period is 5.9181 + or - 0.0003 hr and the peak to peak lightcurve amplitude is 0.088 + or - 0.0003 mag. Photometric parameters are H sub R = 6.24 + or - 0.02 mag and G sub R = + or - 0.15, though formal errors may not be realistic. The lightcurve has two pairs of extrema, but its asymmetry, as evidenced by the presence of significant odd Fourier harmonics, suggests macroscopic surface irregularities and/or the presence of some large scale albedo variegation. The observational rms residual is + or - 0.015 mag. On time scales from minutes to days there is no evidence for nonperiodic (cometary) brightness changes at the level of a few millimagnitudes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-185068 , NAS 1.26:185068
    Format: application/pdf
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  • 2
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    Astrometry of Single-Chord Occultations: Application to the 1993 Triton Event (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: This paper outlines a method for reducing astrometric data to derive the closest approach time and distance to the center of an occultation shadow for a single observer. The method applies to CCD frames, strip scans or photographic plates and uses a set of field stars of unknown positions to define a common coordinate system for all frames. The motion of the occulting body is used to establish the transformation between this common coordinate system and the celestial coordinate system of the body's ephemeris. This method is demonstrated by application to the Tr6O occultation by Triton on 1993 July 10 UT. Over an interval of four nights that included the occultation time, 80 frames of Triton and Tr6O were taken near the meridian with the U.S. Naval Observatory (USNO) 61-inch astrometric reflector. Application of the method presented here to these data yields a closest approach distance of 359 +/- 133 km (corresponding to 0.017 +/- 0.006 arcsec) for the occultation chord obtained with the Kuiper Airborne Observatory (KAO). Comparison of the astrometric closest approach time with the KAO light-curve midtime shows a difference of 2.2 +/- 4.1 s. Relative photometry of Triton and Tr6O, needed for photometric calibration of the occultation light curve, is also presented.
    Keywords: Astrophysics
    Type: NASA/CR-96-207149 , NAS 1.26:207149 , Astronomical Society of the Pacific; 106; 202-210
    Format: application/pdf
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