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J/A+A/320/652       Mass of (11) Parthenope (Viateau+ 1997)

The Bordeaux meridian observations of asteroids. First determination of the mass of (11) Parthenope Viateau B., Rapaport M. <Astron. Astrophys. 320, 652 (1997)> =1997A&A...320..652V (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Ephemerides Keywords: minor planets, asteroids - astrometry - ephemerides - planets: 11 Parthenope; 4 Vesta; 17 Thetis Abstract: The asteroid observations made with the automatic meridian circle at Bordeaux observatory from 1985 to 1994, and which have recently become available, are presented. The residuals of these observations obtained using the orbital elements published in the ``Ephemerides of Minor Planets for 1996'' are analysed. An anomaly for the asteroid (17) Thetis was found, indicating a current close encounter between this asteroid and (4) Vesta. Such an encounter will allow very interesting determinations of the mass of Vesta to be made in the future. Lastly, our determination of the mass of (11) Parthenope is discussed, which was based on its perturbations on the orbit of Thetis. The result obtained, (2.58±0.10)x10-12M☉, appears significant. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file fig5.ps 132 469 Future perturbations of Thetis by Parthenope fig8a.ps 132 511 Past perturbation of Thetis by Parthenope fig8b.ps 132 513 Past perturbation of Thetis by Parthenope fig9.ps 132 362 Distance between Thetis and Europa fig11.ps 132 756 Thetis residuals fig12a.ps 132 764 Thetis residuals (last iteration) fig12b.ps 132 491 Thetis residuals (only used observations) table1 23 133 List of the asteroids observed with the table7 88 5 *Orbital elements of Thetis integrated for current and future dates table1.ps 106 1492 PostScript file of table1 table5.ps 106 511 PostScript file of table5 table6.ps 106 711 PostScript file of table6 table7.ps 106 597 PostScript file of table7
Note to table7: Data taking into account the perturbations of (4) Vesta (mass assumed 1.35x10-10M0) and (11) Parthenope (2.58x10-12M0) Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 3 I3 --- No Asteroid number 5- 16 A12 --- Name Asteroid name 18 A1 --- n_Name [H] H: asteroid in the preliminary Hipparcos list 20- 22 I3 ---- Nobs Number of observations made from 1985 to 1994
Byte-by-byte Description of file: table7
Bytes Format Units Label Explanations
1- 9 F9.1 d Epoch Julian observation epoch 12- 21 A10 --- Date Observation date (YY/MM/DD.D) 23- 33 F11.9 AU a Semi-major axis 35- 44 F10.8 --- e Ellipticity 47- 54 F8.6 deg i Inclination 56- 65 F10.6 deg W Longitude of the ascending node (OMEGA) 67- 76 F10.6 deg w Longitude of perihelion (omega) 78- 87 F10.6 deg M Mean anomaly
Table 5: Correlation coefficients of the resolved system; rows 1 to 6 correspond respectively to the rectangular coordinates of initial position and velocity of (17) Thetis, while the last row concerns the mass of (11) Parthenope ---------------------------------------------------------------------- (17) Thetis (11) Parthenope X0 Y0 Z0 VX0 VY0 VZ0 Mass -------------------------------------------------------------- X0 | 1.00 Y0 | -0.21 1.00 Z0 | -0.09 -0.76 1.00 VX0 | 0.68 0.25 -0.04 1.00 VY0 | 0.92 -0.12 -0.22 0.57 1.00 VZ0 | 0.45 -0.27 0.11 0.40 0.26 1.00 Mass | -0.60 0.07 0.11 -0.44 -0.72 -0.32 1.00 Table 6: Solutions for the mass of (11) Parthenope and the orbital elements of (17) Thetis calculated using different values for the mass of (4) Vesta; "s" is the standard deviation of the residuals calculated with each solution; the central value of the mass of Vesta (1.35x10-10M0) is the value used to calculate the solution given in Table 4 ---------------------------------------------------------------------------- Mass Mass obtained | Difference with the orbital elements | sigma of for | of Thetis given in Table 4 | Vesta Parthenope | Da De Di DW Dw DM | residuals (1010M0) | 10-9AU 10-8 ( 10-6deg ) | " ---------------------------------------------------------------------------- 1.2 2.57 | 2 0 0 1 0 -1 | 0.85 1.3 2.58 | 1 0 0 1 0 0 | 0.85 1.35 2.58 | | 0.85 1.4 2.59 | -1 0 0 1 0 0 | 0.85 1.5 2.60 | -2 0 0 1 0 0 | 0.85 Acknowledgements: Bruno Viateau
(End) Patricia Bauer [CDS] 03-Apr-1997
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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