Pluto: an analysis of photographic positions obtained with the Pulkovo normal astrograph in 1939-1992

Details Pluto: an analysis of photographic positions obtained with the Pulkovo normal astrograph in 1939-1992 Pluto: an analysis of photographic positions obtained with the Pulkovo normal astrograph in 1939-1992

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26at....6..265r&link_type=abstract

Astronomical and Astrophysical Transactions (ISSN 1055-6796), vol. 6, no. 4, p. 265-281

Astronomy and Astrophysics

Astrophysics

3

Astrography, Ephemerides, Planetary Mapping, Pluto (Planet), Position (Location), Time Series Analysis, Astronomical Photometry, Harmonic Analysis, Light Curve, Periodic Variations, Spectrum Analysis, Telescopes

Scientific paper

Results of photographic positional observations of Pluto with the Pulkovo Normal Astrograph (NA, 33/346), made in 1930-1992 and reduced to the system FK5 J2000.0, are presented. All the positions of Pluto observed are compared with the ephemerides JPL DE200. The mean residuals (O - C) in R. A. and Decl. for the middle epochs of observations are given. It is shown that in 1989-1992 the residuals (O - C)alpha reached 2.24 - 2.51 arcsec and keep tendency to further growing. The comparison between the averaged values (O - C)alpha obtained from observations with different telescopes in 1989-1992 is made, and the existance of a well pronounced trend found in earlier work is confirmed. The spectral analysis of the sets of positional and photometric observations of Pluto detected in (O -C)alpha and (O - C)delta at the 95 percent confidence the harmonics with amplitudes 0.15 +/- 0.04arcsec, 0.27 +/- 0.05 arcsec, and periods 2.11 +/- 0.02 yr, 16.5 +/- 0.05 yr, respectively. The periodic component with amplitude 0.16m +/- 0.04m and period 7.88 +/- 0.26 yr is confirmed from analysis of Pluto's light curve for 1954-1990. Possible explanations of the trend and the periodicities found are discussed.

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