Contents. planet: 4 - Mars satellites: M1 - Phobos: 2212, M2 - Deimos: 2700 total number: 4912 type: relative dates: 1877-1982 observatory: 0 - Greenwich ( 10 obs) 1 - Crowborough (Ealing) ( 159 obs) 7 - Paris ( 1 obs) 84 - Pulkovo ( 310 obs) 85 - Kiev ( 230 obs) 105 - Moscow ( 2 obs) 119 - Abastuman ( 216 obs) 135 - Kasan ( 11 obs) 192 - Tashkent ( 12 obs) 481 - (=972) Dun Echt ( 16 obs) 503 - Cambridge ( 58 obs) 522 - Strasbourg ( 29 obs) 662 - Lick Observatory, Mount Hamilton (1718 obs) 672 - Mount Wilson ( 12 obs) 689 - U.S. Naval Observatory, Flagstaff ( 10 obs) 711 - McDonald Observatory, Fort Davis ( 22 obs) 742 - Drake University, Des Moines (Morrison Observ.)( 55 obs) 754 - Yerkes Observatory, Williams Bay ( 28 obs) 786 - U.S. Naval Obs., Washington (since 1893) (1045 obs) 787 - U.S. Naval Obs., Washington (before 1893) ( 534 obs) 802 - Harvard Observatory, Cambridge ( 415 obs) 981 - Armagh (Sherrington, Bray, Ireland) ( 11 obs) 996 - Oxford ( 8 obs) Reference. Erck W. (1877) Satellite of Mars. Astronomical register. V. 15. N. 179. P. 293-294. Rodgers J. (1877) Letter to the Hon. R. W. Thompson, Secretary of the Navy, announcing the discovery of satellites of Mars. Astronomische Nachrichten. V. 90. N. 2154. P. 273-276. 1877AN_____90__273R Rodgers J. (1877) Letter to the Hon. R. W. Thompson, Secretary of the Navy, announcing the discovery of satellites of Mars. Monthly notices of the Royal astronomical society. V. 37. N. 9. P. 443-445. 1877MNRAS__37__443R Common A.A. (1878) Note on the satellites of Mars and Saturn. Monthly notices of the Royal astronomical society. V. 38. N. 3. P. 97-99. 1878MNRAS__38___97C Hall A. (1878) Observations and Orbits of the Satellites of Mars, with data for Ephemerides in 1879. U.S.Government Printing Office. Washington D.C. P. 1-46. 1878QB403_H17______ Hall A. (1878) Observations of the satellites of Mars, made with the 26-inch refractor of the U.S. Naval Observatory, Washington. Astronomische Nachrichten. V. 91. N. 2161. P. 11-14. 1878AN_____91___11H Pritchett H.S. (1878) Observations of the satellites of Mars, made with the 12 1/4-inch Equatorial of the Morrison Observatory. Astronomische Nachrichten. V. 91. N. 2172. P. 185-188. 1878AN_____91__185P Waldo L. (1878) Observations of the satellites of Mars, made at the Observatory of Harvard College. Astronomische Nachrichten. V. 92. N. 2190. P. 87-94. 1878AN_____92___87W Common A.A. (1879) Observations of the satellites of Mars. Monthly notices of the Royal astronomical society. V. 40. N. 2. P. 95-99. 1879MNRAS__40___95C Lindsay Lord (1879) Observations of the outer satellite of Mars made at Dun Echt observatory. Monthly notices of the Royal astronomical society. V. 40. N. 2. P. 102-103. 1879MNRAS__40__102L Royal observatory, Greenwich (1879) Micrometer-Measures of the Outher Satellite of Mars, Deimos, made with the South-East Equatoreal at the Royal Observatory, Greenwich, in the Year 1879 Royal observatory, Greenwich. P. 64-65. 1879ses__book___64R Common A.A. (1880) Beobachtung des ausseren Marssatelliten. Astronomische Nachrichten. V. 96. N. 2283. P. 41-42. 1880AN_____96___41C Hall A. (1880) Observations of the satellites of Mars. Monthly notices of the Royal astronomical society. V. 40. N. 5. P. 272-283. 1880MNRAS__40__272H Maunder (1880) Observation of the outer satellite of Mars, made at the Royal observatory, Greenwich. Monthly notices of the Royal astronomical society. V. 40. N. 3. P. 161-162. 1880MNRAS__40__161M Pickering E.C. (1880) Observations of the satellites of Mars, made at the Harvard College Observatory. Astronomische Nachrichten. V. 97. N. 2312. P. 115-128. 1880AN_____97__115P Pickering E.C. (1880) Observations of the satellites of Mars, made at the Harvard College Observatory. (2). Astronomische Nachrichten. V. 97. N. 2314. P. 145-148. 1880AN_____97__145P Pritchard C. (1880) Observations of the exterior satellite of Mars at the Oxford Univesity observatory. Monthly notices of the Royal astronomical society. V. 40. N. 5. P. 292-292. 1880MNRAS__40__292P Pritchett C.W. (1880) Observations of Phobos and Deimos. Astronomische Nachrichten. V. 97. N. 2307. P. 45-48. 1880AN_____97___45P Common A.A. (1882) Satellites of Mars 1881. Astronomische Nachrichten. V. 103. N. 2463. P. 233-234. 1882AN____103__233C Hall A. (1882) Observations of the satellites of Mars in the opposition of 1881. Astronomische Nachrichten. V. 102. N. 2438. P. 217-220. 1878AN____102__217H Maunder (1882) Observation of the outer satellite of Mars made at the Royal Observatory, Greenwich. Monthly notices of the Royal astronomical society. V. 42. N. 3. P. 100-100. 1882MNRAS__42__100M Pickering E.C. (1882) Satellites of Mars (Charpers 5 and 6). Annals of the Astronomial observatory of Harvard College. V. 13. P. 92-143. 1882AnHar__13___92P Hall A. (1884) Observations made at the U.S. Naval observatory, Washington. Monthly notices of the Royal astronomical society. V. 44. N. 7. P. 358-361. 1884MNRAS__44__358H Henry Paul, Henry Prosper (1884) Observations faites a l'Observatoire de Paris (equatorial de 0.38 m; tour de l'Est) Bulletin Astronomique, 1-e serie. V. 1. P. 15-15. 1884BAOdP___1___15H Henry Paul, Henry Prosper (1884) Observations faites a l'Observatoire de Paris (equatorial de 0.38 m; tour de l'Est) (en fevrier). Bulletin Astronomique, 1-e serie. V. 1. P. 89-89. 1884BAOdP___1___89H Hall A. (1886) Observations at U.S.N. observatory. Monthly notices of the Royal astronomical society. V. 46. N. 8. P. 454-454. 1886MNRAS__46__454H Henry Paul, Henry Prosper (1886) Observations des satellites de Mars, Uranus et Neptune faites a l'Observatoire de Paris (equatorial de 0.38 m; tour de l'Est). Bulletin Astronomique, 1-e serie. V. 3. P. 488-488. 1886BAOdP___3__488H Hall A. (1888) Observations on Mars. Astronomical journal. V. 8. N. 181. P. 98-98. 1888AJ______8___98H Keeler J.E. (1888) Micrometer observations of the satellites of Mars. Astronomical journal. V. 8. N. 178. P. 73-78. 1888AJ______8___73K Hall A. (1890) Observations of the satellites of Mars in 1890. Astronomical journal. V. 10. N. 226. P. 74-75. 1890AJ_____10___74H Keeler J.E. (1890) Observations of the satellites of Mars. Astronomical journal. V. 10. N. 228. P. 89-91. 1890AJ_____10___89K Campbell W.W. (1892) Observations of Mars and its satellites. Astronomical journal. V. 12. N. 282. P. 137-139. 1892AJ_____12__137C Hall A. (1893) Observations of Mars, 1892. Astronomical journal. V. 12. N. 288. P. 185-188. 1893AJ_____12__185H Campbell W.W. (1895) Micrometer-observations of the satellites of Mars. Astronomical journal. V. 15. N. 337. P. 1-4. 1895AJ_____15____1C Newall M.A. (1895) Micrometer measurements of Phobos, the inner satellite of Mars during the opposition of 1894. Monthly notices of the Royal astronomical society. V. 55. N. 7. P. 348-353. 1895MNRAS__55__348N Royal observatory, Greenwich (1895) Micrometric Observations of the Satellites of Mars made with the 28-inch Refractor, 1894. Micrometric Measures of Planets and Satellites. 1894 and 1895. Royal observatory, Greenwich. P. 155-155. 1895ses__book__155R Barnard E.E. (1897) Measures of the diameters of Mars and the positions of his satellites in 1894. Astronomical journal. V. 17. N. 403. P. 145-147. 1897AJ_____17__145B Kostinsky S. (1897) Sur les photographies du satellite exterieur de Mars (en russe). Bulletin de l'Academie Imperiale des sciences de St.-Petersbourg. V serie. V. 7. N. 4. P. 399. 1897BAISP___7__399K Schaeberle J.M. (1897) Observations of the satellites of Mars during the opposition of 1896. Astronomical journal. V. 17. N. 399. P. 113-114. 1897AJ_____17__113S Hussey W.J. (1898) Observations of the satellites of Mars. Astronomical journal. V. 18. N. 424. P. 122-123. 1898AJ_____18__122H Kostinsky S. (1898) Deux positions du satellite exterieur de Mars. Astronomische Nachrichten. V. 145. N. 3469. P. 203-204. 1898AN____145__203K Struve H. (1898) Beobachtungen der Marstrabanten in Washington, Pulkowa und Lick-observatory. Memoires de L'Academie Imperiale des sciences de St.-Petersbourg. VIII serie. Classe Physico-mathematique. St.-Petersbourg. V. 8. N. 8. P. 1-73. 1898MAISP___8____1S Brown S.J. (1899) Orbits of the satellites of Mars from observations made at the U.S. Naval observatory and the Lick observatory, 1894-6. Astronomical journal. V. 20. N. 367. P. 81-90. 1899AJ_____20___81B Aitken R.G. (1909) Observations of the satellites of Mars, Saturn and Uranus. Lick Observatory Bulletin. University of California. V. 5. N. 172. P. 169-173. 1909LicOB___5__169A Wirtz C. (1909) Trabantenbeobachtungen in den Jahren 1881-1896, im wesentlichen ausgefuhrt von H.Kobold, bearbaitet von C.W.Wirtz. Annalen der Kaiserlichen Universitats-Sternwarte in Strassburg. V. 3. P 5-5. 1909AKUSS___3____5W Barnard E.E. (1910) Observations of the satellites of Mars. Astronomical journal. V. 26. N. 608. P. 69-70. 1910AJ_____26___69B Kostinsky S. (1910) Sur les photographies des satellites de Mars. Astronomische Nachrichten. V. 183. N. 4369. P. 7-10. 1910AN____183____7K USNO (1911) Equatorial observations, 1893-1907. Publications of U.S.Naval Observatory, 2nd Series. USNO. Washington D.C. V. 6. P. A3-A5. 1911PUSNO___6___A1S Wirtz C. (1911) Beobachtungen von Satelliten. Annalen Kaiserlichen Universitats-Sternwarte Strassburg Karlsruhe. V. 4. P. 292-292. 1911AKUSS___4__292W Hall A. (1913) Observations of the satellites of Mars. Astronomical journal. V. 27. N. 645. P. 163-169. 1913AJ_____27__163H Kostinsky S. (1913) Observations photographiques des satellites de Mars faites en 1909 a l'astrographe normal de Poulkovo. Mitteilungen des Nikolai-Hauptsternwarte zu Pulkovo. V. 5. N. 59. P. 149-176. 1913IzNic___5__149K 1913MNHP____5__149K Burton H.D., Hall A. (1923) Observations of the satellites of Mars, 1911-22. Astronomical journal. V. 35. N. 830. P. 113-115. 1923AJ_____35__113B Jeffers H.M. (1925) Observations of the satellites of Mars. Lick Observatory Bulletin. V. 12. N. 360. P. 4-8. 1925LicOB_360____4J Lamson E.A., Hall A., Bower E.C. (1926) Corrections to the elements of the satellites of Mars. Astronomical journal. V. 37. N. 873. P. 69-74. 1926AJ_____37___69L Hall A., Burton H.D. (1929) Corrections to the elements of the satellites of Mars. Astronomical journal. V. 39. N. 928. P. 151-154. 1929AJ_____39__151H USNO (1929) Observations of Satellites: Satellites of Mars. Publications of U.S.Naval Observatory, 2nd Series. USNO. Washington D.C. V. 12. P 81-89. 1929PUSNO__12___92S USNO (1954) Observations of satellites made with the 26-inch equatorial of the U.S.Naval observatory. 1928-47. Publications of the U.S.Naval Observatory, 2nd Series. USNO. Washington D.C. V. 17. N. 3. P. 125-126. 1954PUSNO__17___94S Karimova D.K., Kholopov P.N. (1969) Positions of Deimos during the great opposition of Mars in 1967. Astronomitcheskij tsircular izdavaemyj Buro astronomitcheskich soobshchenij Academii nauk USSR. Moscow. N. 530. P. 5-6. 1969ATsir_530____5K Kovalenko N.D., Telnyuk-Adamchuk V.V. (1969) Observations of Mars and Deimos by the astrograph of Kiev university observatory. Vestnik Kievskogo universiteta. Seria Astronomija. Kiev university. Kiev. N. 11. P. 129-130. 1969VKUA___11__129K Rizvanov N.G., Shchukin E.M. (1969) Photographic observations of Mars and Deimos. Izvestija Astronomitsheskoi Engelgardtovskoj Observatorii. Kazan University. Kazan. N. 37. P. 153-154. 1969IzAOE__37__153R Biesbroeck G Van (1970) Measures of the satellites of Uranus and Mars. Communications of Lunar and Planetary Laboratory. V. 8. P. 179-188. 1970CoLPL___8__179B Deutsch A.N. (1970) Photographic Observations of the Satellites of Mars at the Pulkovo Observatory. Izvestiya glavnoi astronomicheskoi observatorii. Leningrad. N. 185. P. 103-109. 1970IzPul_185__103D Fatchikhin N.V. (1970) Photographic Observations of Deimos Made with the Pulkovo Normal Astrograph During the Opposition of Mars in 1967. Izvestiya glavnoi astronomicheskoi observatorii. Leningrad. N. 185. P. 110-116. 1970IzPul_185__110F Onegina A.B., Sereda E.M. (1971) Photograpnic observations of Deimos at the main astronomical observatory of the ukrainian academy of scienses in 1967. Bulleten' instituta teoreticheskoi astronomii (Institut for theoretical astronomy, Bulletin). Leningrad. V. 12. N. 8. P. 732-732. 1971BITA___12__732O Pascu D. (1972) Ph. D. Thesis. University of Virginia. 1972PhDT_________1P Bashtova L.I., Rakhimov A.G. (1973) The precise positions of Mars and its satellite Deimos from the photographic observations in Tashkent. Tsirkular of the astronomical institute Tashkent. Tashkent. N. 42(389). P. 35-38. 1973TITas__42___35B Tel'nyk-Adamchuk V.V., Berezovsky O.A., Kovalenko N.D. (1973) Photograph of Mars and its satellites during the opposition in 1971. Vestnik Kievskogo Universiteta, Astronomia. N. 15. P. 47-51. 1973VKUA___15___47T Khatisov A.S., Salukvadze G.N. (1974) Relative positions of Phobos and Deimos. Bulleten Abastumanskoj astrofizitsheskoj observatorii. Tbilisi. N. 45. P. 71-74. 1974AbaOB__45___71K Khatisov A.Sh., Salukvadze G.N. (1975) Results of positional observations of the Martian satellites. Abastumanskaia Astrofizicheskaia Observatoriia, Biulleten', In Russian. N. 46. P. 217-224. 1975AbaOB__46__217K Kiseleva T.P. (1976) Position observations of satellites of Mars in 1973. Izwestija Glavnoj astronomiceskoj observatorii v Pulkove. N. 194. P. 127-129. 1976IzPul_194__127K Sereda E.M., Izhakevich E.M. (1978) Photographic positional observations of Mars and Deimos with 400 mm astrograph of the main astronomical observatory of the ukrainian academy of sciences. Astrometrija i Astrophisika. Naukova dumka. Kiev. N. 36. P. 72-81. 1978AAfz___36___72S Kovalenko N.D. Makarenko I.F., Mandzhos A.V., Tel'nyk-Adamchuk V.V. (1980) Results of the position observations of Mars and its satellites during the opposition in 1973. Vestnik Kievskogo Universiteta, Astronomia. N. 22. P. 78-85. 1980VKUA___22___78K Sereda E.M. (1981) Photographic position observations of Mars and Deimos at the Main Astronomical Observatory of Ukrainean Academy of Science in 1975-1976. Scientific paper deposited in All-russian institute of scientific and technical information. N. 3868-81. P. 1-11. 1981PDRII3868_____S Major S.P., Sereda E.M. (1983) Position photographic observations of Mars and Deimos at the Main Astronomical Observatory of Ukrainean Academy of Science in 1977-1978. Scientific paper deposited in All-russian institute of scientific and technical information N. 6759-83. P. 1-29. 1983PDRII6759____1M Tolbin S.V. (1985) Photographic positions of Mars and its satellites obtained with the 26-arcsec refractor at Pulkovo in 1982 (In Russian). Pulkovo, Glavnaia Astronomicheskaia Observatoriia, Izvestiia. N. 203. P. 44-49. 1985IzPul_203___44T Pascu D. (1988) Private Communication. Morley T.A. (1989) A catalogue of ground-based astrometric observations of the Martian satellites, 1877-1982. Astronomy and Astrophysics Supplement Series. V. 77. N. 2. P. 209-226. 1989A&AS___77__209M Informations. relative to: 1 - Phobos relative to Mars : 2212, 2 - Deimos relative to Mars : 2600, 3 - Deimos relative to Phobos: 100 reference frame: astrometric centre of frame: topocentre epoch of equinox: 1 - true equator and equinox of date 2 - mean equator and equinox of B1900 3 - mean equator and equinox of B1950 4 - mean equator and equinox of J2000 time scale: UTC reduction: 0 - not corrected or no information 1 - corrected for phase, 2 - corrected for differential refraction 3 - both 1 and 2 coordinates: 0 - separation and/or position angle 1 - X, Y 2 = Delta alpha, Delta delta diff. refraction: 0 - not corrected or no information 1 - corrected for phase, 2 - corrected for differential refraction 3 - both 1 and 2 receptor: see observer code telescope: see observer code observers: observer code: 1 - Hall, Newcomb, Harkness. Telescope: 26-inch. Recepteur: micrometer. 2 - Kostinsky S. Telescope: 13-inch normal astrograph. Recepteur: photographic. 3 - Common A A. Telescope: 18-inch (silver) reflector, powers 170 and 272. Telescope: 36-inch reflector, powers 220, 240 and 380. Telescope: 3-foot Reflector. Recepteur: micrometer. 4 - Keeler J E. Telescope: 36-inch equatorial. Recepteur: micrometer. 5 - Campbell W W. Telescope: 36-inch equatorial. Recepteur: micrometer. 6 - Telescope: 26-inch equatorial. Recepteur: micrometer. 7 - Maunder. Telescope: 12 3/4-inch great equatorial. Recepteur: micrometer. 8 - Newall M A. Telescope: 25-inch refractor. Recepteur: micrometer. 9 - Hussey W J. Telescope: 36-inch refractor, magnifying - 520. Recepteur: micrometer. 10 - Schaeberle J M. Telescope: magnifying power - 320. Telescope: 26-inch normal equatorial, magnifying power - 383. Recepteur: micrometer. 11 - Frederickson 12 - Rice H. 13 - Hall A. Telescope: 26-inch equatorial. Recepteur: micrometer. 14 - Barnard E E. Telescope: 36-inch. Recepteur: micrometer. 15 - Observers: Aitken R G, Merill P W, Young R, Olivier C P. Telescope: 36-inch refractor, power - 270. Telescope: 40-inch. Recetreur: micrometer. 16 - Burton H.E. 17 - Observers: Hall A, Bower E C. Telescope: 26-inch equatorial. Recepteur: micrometer. 18 - Observer: Jeffers H.M. Telescope: 36-inch refractor, power - 270. Recetreur: micrometer. 19 - USNO. Observators: R., Br., Fk. Telescope: 26-inch equatorial. Recepteur: Clarc micrometer, Repsold micrometer. 20 - Observers: Hall Jr, Lyons U S, Burton H E, Wylie L R, Browne W M, Smith J L, Raynsford G M. Telescope: 26-inch refractor. 21 - Wirtz C., Winnecke, Kobold. Telescope: 49-cm refractor. Recepteur: micrometer. 22 - Richardson R. 23 - Pritchett C W. Telescope: 12 1/4 -inch refractor. Recepteur: micrometer. 24 - Pascu D. 25 - Kuiper G.P., Biesbroeck G Van. Telescope: 82-inch reflector. Recepteur: photographic. 26 - Observer: Deutsch A N. Observer: Fatchikhin N V. Telescope: Normal astrograph. Recepteur: photographic. 27 - Observer: Tolbin S V. Telescope: 26 inch refractor. Recepteur: Photographic. 28 - Observers: Onegina A.B., Sereda E.M., Ishakevich E.M. Telescope: Astrograph - 400 mm. Recepteur: photographic. 29 - Observers: Rizvanov N G, Shchukin E M. Telescope: 16-inch refractor. Recepteur: photographic. 30 - Observers: Kovalenko N D, Telnyk-Adamchuk V V. Telescope: 8-inch astrograph. Receteur: Phographic. 31 - Copeland R, Lohse J G. Telescope: 15.06-inch refractor, power 229. Recepteur: micrometer. 32 - Observers: Kiseleva T P. Telescope: refractor, D=26 inch. Recepteur: photographic. 33 - Observers: Khatisov A S, Salukvadze G N. Recepteur: photographic. 34 - Pritchett H S. Telescope: 12 1/4 -inch refractor. Recepteur: micrometer. 35 - Observers: Bashtova L I, Rakhimov A G. Telescope: normal astrograph, F=3.4 m, D=33 cm. Recepteur: photographic. 36 - Waldo L. Telescope: 15-inch Merz Equatorial. Recepteur: micrometer. 37 - Pickering E.C., Wendell O. C. Telescope: 15-inch Merz Equatorial, focal length 683 cm. Recepteur: micrometer. 38 - Plummer W. Telescope: 12-inch Grubb equatoreal, power 125. Recepteur: micrometer. 39 - Wagner A. 40 - Erck W. Recepteur: Micrometer. Power: 300. Aperture: 4.5 diameter. 41 - Henry MM. Telescope: Objectif de 14 puces. Grossissement employe: 250. Recepteur: micrometer. 42 - Karirova D K, Kholopov P N. Telescope: AZT-2, D=70 cm. Recepteur: photographic. 43 - Struve H. Telescopes: in Washington - la moitie de l'oculaire de 400 grondissement etait couvert par un verre colore a travers duquel on pouvait juste reconnaitre le fil micrometrique, Pulkowo - 30-inch refractor, Lick - refractor. 44 - Renze F. data included in standard data file: no Comments. 1. Contradiction in observations by observatory 135 - Kasan: In the publication we see that the phase corrections were not done and in the catalogue Morley index 1 shows that they were done. Data in the catalogue are the sames as in publication. Format. 1. Acceptance code: 1 Accepted data, 0 - Deleted (bad quality) 2. Opposition number: 1 - 1877, ..., 50 - 1982 3. Year of the moment of observation 4. Month of the moment of observation 5. Day of the moment of observation with decimals 6. (ET-UTC) in tenths of second 7. Observer code 8. Observatory N 9. Observed body: 1 - Phobos relative to Mars 2 - Deimos relative to Mars 3 - Deimos relative to Phobos 10. Obs. type: 0 - separation and/or position angle 1 - differential R.A.(*cosine(dec.)) and/or differential declination 2 - Delta a or Delta d, see Note 0 . 11. Presence flag for 1st value of pair: 0 - value absent 1 - value present 12. Presence flag for 2st value of pair: 0 - value absent 1 - value present 13. Ref. system: 1 - true equator and equinox of date 2 - mean equator and equinox of B1900 3 - mean equator and equinox of B1950 4 - mean equator and equinox of J2000 14. 1st value of observation, seconds of arc (0.0 if absent), see note 4 15. 2st value of observation, seconds of arc or degrees if position angle (0.0 if absent), see note 4 16. 1-sigma noise in 1st value of pair (seconds of arc) (0.0 if absent), see notes 3, 4 17. 1-sigma noise in 2nd value of pair (seconds of arc) (0.0 if absent), see notes 3, 4 18. Observation correction (reduction) code: 0 - not corrected or no information 1 - corrected for phase, 2 - corrected for differential refraction 3 - both 1 and 2 Notes: Note 0. Obs. type 2. They are rectangular coordinates in a frame whose reference axis is orientated at the angle to celestial north. These types of measurements were made parallel and normal to the direction of the Mars rotation axis. The measurements are denoted by Delta a and Delta d. The units are arcseconds. The position angle of the axis 'Delta a' is denoted by 'theta'. The axis 'Delta d' is orientated at an angle 'theta - 90 deg' to celestial north. See also Note 4. Note 1. The units for the observations are seconds of arc except for position angle when the unit is degrees east of north in the range 0 - 360. Note 2. The units for the observation noise are always seconds of arc. For a position angle p, the noise refers to the product of the error in p and the separation angle. Note 3. In the ESOC system, when the noise is greater or equal to 99.0 the corresponding observation is of bad quality and is not used in the determination of the orbit but its residual is computed and printed. Note 4. When the observation is either Delta a or Delta d the columns normally used for the complementary observation are used to store the position angle, theta. Also, the columns normally used to store the noise of the complementary observation contain 0.0. ------------------------------------------------------------------------------- ET-UTC Body N opp. Observer Ref.s. Year Month Day Observatory Sigma 1 Sigma 2 Accept. Presence Corr. code v1 v2 Value 1 Value 2 code -------------------------------------------------------------------------------