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Accurate Positions of Pluto and Asteroids Observed in Bucharest During the Year 1932

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Accurate Positions of Pluto and Asteroids Observed in Bucharest During the Year 1932 ACCURATE POSITIONS OF PLUTO AND ASTEROIDS OBSERVED IN BUCHAREST DURING THE YEAR 1932 GHEORGHE BOCŞA, PETRE POPESCU, MIHAELA LICULESCU Astronomical Institute of the Romanian Academy Str. Cuţitul de Argint 5, 040557 Bucharest, Romania E-mail: [email protected] Abstract. The paper contains the observations of minor planets performed in Bucharest Astronomical Observatory in the year 1932 with the 380/6000 mm astrograph. Both Turner’s (constants) and Schlesinger’s (dependences) methods were used in the computation of the normal coordinates of the objects. Keywords: photographic astrometry – minor planets. 1. INTRODUCTION The article is a continuation of the complete investigation of Bucharest Wide-Field Plates Archive initiated in 2010; it contains the plates with asteroids observed in 1932. That year 185 plates were exposed and were stored in the archive, but were not reduced. After analysing them, 98 plates were detected to contain measurable minor planets. The first observed positions in this year were of planet Pluto. They were exposed on 1318cm plates, with 52 minutes exposure .The observations were performed by the famous Romanian astronomer Professor Gheorghe Demetrescu. The most difficult problem was the identification of the planet, the three plates obtained in 1932 having dozens of stars with up to 15 magnitudes. As all the observations were performed in the same month and the planet did not have a great proper motion, it was possible to superpose two plates and to identify Pluto. The values (O–C)α and (O–C)δ were calculated by M. Svechnikov from the Institute of Applied Astronomy in Sankt Petersburg on the basis of precise positions obtained in Bucharest, which we integrated in Pluto’s orbit. The values were very accurate. 2. ACCURATE POSITIONS OF ASTEROIDS To determine more precise positions, we tried to take into account 4–6 reference Rom. Astron. J., Vol. 21, No. 2, p. 000–000, Bucharest, 2011 Gheorghe BOCŞA, Petre POPESCU, Mihaela LICULESCU 2 stars, whenever possible. We used Positions and Proper Motions (PPM) Star Catalogue J 2000.0 or Tycho Star Catalogue J 2000.0, referring all the results to the epoch 2000.0. To perform the observations, the 380/6000 mm astrograph with the field of 2º2º was used. The plates exposed were of 1318 cm and the measurements were performed by means of an ASCORECORD measuring machine. In the computations we used the same program for all plates. All computations were performed in double precision. Both Turner’s (constants) and Schelsinger’s (dependencies) methods were used for the computation of the normal coordinates of the object. In the method of the constants, the values were determined together with their errors – for every star the residuals were computed. Table 1 contains: the number, the name of the asteroid, the observation moment (year, month, day and fraction of the day in UT), α2000.0, δ2000.0. Table 1 Pluto and asteroids observed during 1932 in Bucharest Observatory Data [UT] α2000.0 δ2000.0 Name h m s ˚ 1 2 3 4 Pluto 1932 01. 07.95017 7 35 54.645 +22 08 56.50 1932 01. 15.91495 7 35 11.033 22 11 06.97 1932 01. 29.88824 7 33 56.211 22 14 48.39 2 Pallas 1932 05. 31.88064 17 55 21.497 24 34 41.26 1932 05. 31.88523 17 55 21.274 24 34 42.21 3 Juno 1932 01. 07.86567 7 12 07.793 1 06 52.69 1932 01. 07.87012 7 12 07.536 1 06 54.75 4 Vesta 1932 11. 03.91854 4 19 25.325 12 53 29.89 1932 11. 03.92408 4 19 25.074 12 53 30.32 5 Astraea 1932 12. 05.91121 6 27 59.041 15 38 33.97 1932 12. 05.91640 6 27 59.293 15 38 33.32 1932 12. 13.88936 6 21 25.225 15 45 04.89 1932 12. 13.89430 6 21 25.393 15 45 04.48 8 Flora 1932 11. 30.93074 6 08 53.330 17 29 56.75 1932 11. 30.93420 6 08 53.114 17 29 57.45 11 Parthenope 1932 12. 05.86793 4 48 24.506 16 19 59.54 1932 12. 05.87247 4 48 24.810 16 19 59.60 12 Victoria 1932 10. 01.86327 23 01 45.600 8 41 57.67 12 Victoria 1932 10. 01.87020 23 01 45.818 8 42 02.52 14 Irene 1932 11. 30.88953 3 35 26.023 12 34 45.34 3 Accurate Positions of Pluto and Asteroids 1932 1932 11. 30.89369 3 35 25.767 +12 34 45.61 18 Melpomene 1932 06. 11.92820 18 30 09.914 - 7 56 58.76 1932 06. 11.93443 18 30 09.604 - 7 56 58.99 21 Lutetia 1932 11. 29.90161 4 41 45.038 +21 12 28.99 1932 11. 29.90576 4 41 44.746 21 12 28.86 25 Phocaea 1932 10. 29.93738 4 14 04.284 9 53 20.82 1932 10. 29.94292 4 14 04.544 + 9 53 24.99 26 Proserpina 1932 09. 28.84018 23 19 59.804 - 9 05 52.17 1932 09. 28.84710 23 19 59.492 - 9 05 53.97 27 Euterpe 1932 09. 30.91713 2 13 33.573 +10 33 01.49 1932 09. 30.92510 2 13 33.230 +10 32 59.81 32 Pomona 1932 06. 21.91543 20 01 59.993 -12 20 35.07 1932 06. 21.92167 20 02 00.260 -12 20 34.74 34 Circe 1932 10. 25.96803 2 56 41.392 +11 42 39.94 1932 10. 25.97444 2 56 41.738 11 42 42.03 39 Laetitia 1932 10. 22.86923 2 43 00.902 0 43 53.07 1932 10. 22.87476 2 43 00.359 0 43 50.67 42 Isis 1932 04. 07.89460 14 00 06.399 0 39 21.09 1932 04. 07.91012 14 00 06.149 0 39 22.68 45 Eugenia 1932 01. 05.84797 7 00 29.570 15 39 19.10 1932 01. 05.85207 7 00 29.803 15 39 18.07 52 Europa 1932 10. 29.85635 1 36 49.834 - 1 19 39.28 1932 10. 29.86223 1 36 49.576 1 19 40.38 56 Melete 1932 05. 25.92276 17 51 43.236 10 04 30.12 1932 05. 25.92969 17 51 43.009 -10 04 31.05 57 Mnemosyne 1932 09. 30.91713 2 10 35.741 +11 07 03.57 1932 09. 30.92510 2 10 35.498 11 06 59.74 60 Echo 1932 01. 05.84797 6 58 42.190 15 31 35.49 1932 01. 05.85207 6 58 42.423 15 31 34.90 62 Erato 1932 10. 29.90379 2 58 38.420 13 14 26.62 1932 10. 29.91002 2 58 38.099 13 14 25.24 66 Maja 1932 10. 22.85225 1 52 03.841 13 42 10.95 1932 10. 22.85779 1 52 03.544 13 42 10.75 68 Leto 1932 10. 29.88665 2 18 27.964 11 35 22.09 1932 10. 29.89115 2 18 28.214 11 35 22.15 77 Friga 1932 10. 23.97419 2 52 00.238 19 06 08.07 1932 10. 23.97938 2 51 59.949 19 06 07.18 79 Eurynome 1932 10. 25.90397 4 07 25.796 17 47 02.91 1932 10. 25.91367 4 07 25.521 17 46 59.56 Gheorghe BOCŞA, Petre POPESCU, Mihaela LICULESCU 4 85 Io 1932 02. 08.84277 8 25 43.851 2 22 26.54 1932 02. 08.84866 8 25 43.567 2 22 27.96 89 Julia 1932 12. 05.89805 6 31 27.764 41 50 05.30 1932 12. 05.90230 6 31 28.047 41 50 05.25 1932 12. 13.87513 6 21 02.468 41 33 23.52 1932 12. 13.87790 6 21 15.101 +41 33 22.35 94 Aurora 1932 04. 01.91598 13 08 39.775 -10 04 20.92 100 Hekate 1932 03. 29.85631 12 17 35.338 + 6 15 12.38 1932 03. 29.86220 12 17 35.592 + 6 15 09.96 114 Kassandra 1932 07. 06.94129 20 03 00.644 -14 35 03.20 1932 07. 06.94821 20 03 00.684 -14 35 07.20 119 Althea 1932 12. 05.88143 5 11 34.996 +15 25 26.78 1932 12. 05.88662 5 11 35.335 15 25 27.28 121 Hermione 1932 11. 30.91718 4 47 17.715 21 35 28.66 1932 11. 30.92226 4 47 17.455 21 35 28.79 124 Alkeste 1932 09. 27.90108 0 21 58.072 2 40 46.07 1932 09. 27.90402 0 21 58.239 2 40 47.10 129 Antigone 1932 05. 09.87236 14 39 22.762 6 35 46.82 1932 05. 09.87721 14 39 22.710 + 6 35 46.80 135 Hertha 1932 09. 26.93636 23 39 36.483 - 0 54 10.50 1932 09. 26.94121 23 39 36.740 0 54 09.54 138 Tolosa 1932 09. 30.82156 23 14 31.803 10 22 54.74 1932 09. 30.82745 23 14 31.560 -10 22 55.27 143 Adria 1932 09. 27.86229 23 45 27.109 + 7 13 20.40 1932 09. 27.86783 23 45 26.836 7 13 19.74 144 Vibilia 1932 10.
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