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EPHEMERIDIES OF MINOR PLANETS (EMP)

UPDATED EPHEMERIDES OF MINOR PLANETS

    Files “Updated Ephemerides of Minor Planets” (UEMP) comprise some part of the Tables now available in the Ephemerides of Minor Planets (EMP) published by the Institute of Applied Astronomy (IAA) on the yearly basis. As distinct from the printed version of EMP UEMP give corresponding information for all numbered minor planets as of date of the last (or last but one) batch of Minor Planet Circulars (MPC) issued by the Minor Planet Center. Content of these Tables is presented as a number of ASCII files downloaded into the server of IAA in two forms, "compressed" and "non compressed".
    The files are intended to be downloaded by anonymous user via FTP.
    UEMP comprise following files.

  1. Osculating elements of all currently numbered minor planets for some epoch close up the middle of present (current) month.
  2. Opposition dates of all numbered minor planets within current year.
  3. Ephemerides of all numbered minor planets having the oppositions within three months closest to the present date.
    Content of these files is renewed on a monthly basis and it reflects not only rising number of minor planets, but all current changes (naming, improvement of elements, etc) as well. The updating is carried into effect the last working day of a month.
     Below the information on the files downloaded into the IAA server (non compressed form).

File nameVolume (in Kbt) Contents
readme.txt    15.883 description of Tables
elements of planets with numbers
elem01.txt1140.500           1 –      5000
elem02.txt1140.500     5001 –    10000
elem03.txt1140.500   10001 –    15000
elem04.txt1140.500   15001 –    20000
elem05.txt1140.500   20001 –    25000
elem06.txt1140.500   25001 –    30000
elem07.txt1140.500   30001 –    35000
elem08.txt1140.500   35001 –    40000
elem09.txt1140.500   40001 –    45000
elem10.txt1140.500   45001 –    50000
elem11.txt1140.500   50001 –    55000
elem12.txt1140.500   55001 –    60000
elem13.txt1140.500   60001 –    65000
elem14.txt1140.500   65001 –    70000
elem15.txt1140.500   70001 –    75000
elem16.txt1140.500   75001 –    80000
elem17.txt1140.500   80001 –    85000
elem18.txt1140.500   85001 –    90000
elem19.txt1140.500   90001 –    95000
elem20.txt1140.500   95001 – 100000
elem21.txt1140.500100001 – 105000
elem22.txt1140.500105001 – 110000
elem23.txt1140.500110001 – 115000
elem24.txt1140.500115001 – 120000
elem25.txt1140.500120001 – 125000
elem26.txt1140.500125001 – 130000
elem27.txt1140.500130001 – 135000
elem28.txt1140.500135001 – 140000
elem29.txt1140.500140001 – 145000
elem30.txt1140.500145001 – 150000
elem31.txt1140.500150001 – 155000
elem32.txt1140.500155001 – 160000
elem33.txt1140.500160001 – 165000
elem34.txt1140.500165001 – 170000
elem35.txt1140.500170001 – 175000
elem36.txt1140.500175001 – 180000
elem37.txt1140.500180001 – 185000
elem38.txt1140.500185001 – 190000
elem39.txt1140.500190001 – 195000
elem40.txt1140.500195001 – 200000
elem41.txt1140.500200001 – 205000
elem42.txt1140.500205001 – 210000
elem43.txt1140.500210001 – 215000
elem44.txt1140.500215001 – 220000
elem45.txt1140.500220001 – 225000
elem46.txt1140.500225001 – 230000
elem47.txt1140.500230001 – 235000
elem48.txt1140.500235001 – 240000
elem49.txt1140.500240001 – 245000
elem50.txt1140.500245001 – 250000
elem51.txt1140.500250001 – 255000
elem52.txt1140.500255001 – 260000
elem53.txt1140.500260001 – 265000
elem54.txt1140.500265001 – 270000
elem55.txt1140.500270001 – 275000
elem56.txt1140.500275001 – 280000
elem57.txt1140.500280001 – 285000
elem58.txt1140.500285001 – 290000
elem59.txt1140.500290001 – 295000
elem60.txt1140.500295001 – 300000
elem61.txt1140.500300001 – 305000
elem62.txt1140.500305001 – 310000
elem63.txt1140.500310001 – 315000
elem64.txt1140.500315001 – 320000
elem65.txt1140.500320001 – 325000
elem66.txt1140.500325001 – 330000
elem67.txt1140.500330001 – 335000
elem68.txt1140.500335001 – 340000
elem69.txt1140.500340001 – 345000
elem70.txt1140.500345001 – 350000
elem71.txt1140.500350001 – 355000
elem72.txt1140.500355001 – 360000
elem73.txt1140.500360001 – 365000
elem74.txt1140.500365001 – 370000
elem75.txt1140.500370001 – 375000
elem76.txt1140.500375001 – 380000
elem77.txt1140.500380001 – 385000
elem78.txt1140.500385001 – 390000
elem79.txt1140.500390001 – 395000
elem80.txt1140.500395001 – 400000
elem81.txt1140.500400001 – 405000
elem82.txt1140.500405001 – 410000
elem83.txt1140.500410001 – 415000
elem84.txt1140.500415001 – 420000
elem85.txt1140.500420001 – 425000
elem86.txt1140.500425001 – 430000
elem87.txt1140.500430001 – 435000
elem88.txt1140.500435001 – 440000
elem89.txt1140.500440001 – 445000
elem90.txt1140.500445001 – 450000
elem91.txt1140.500450001 – 455000
elem92.txt1140.500455001 – 460000
elem93.txt   306.020460001 – 461340
opp.txt14302.513 opposition dates in 2016 for
planets with numbers
          1 – 461340
ephemerides of minor planets
2016_02.eph19707.556Feb.1 - Feb.29.999, 2016
2016_03.eph19753.681Mar.1 - Mar.31.999, 2016
2016_04.eph18936.346Apr.1 - Apr.30.999, 2016

DESCRIPTION OF DATA IN THE FILES

Elements

     The files contain osculating elements of numbered minor planets with respect to the ecliptic plane and equinox J2000 for the standard epoch common for all minor planets. Set of data for each planet in general corresponds to those in EMP, but some additional information is also included.
     The data for each planet are given in three successive lines. The first line contains:

  • minor planet number,
  • name or preliminary designation,
  • photometric parameters, H and G (the default value of the slope parameter G equal to 0.15 is indicated as X). epoch of elements (year, month, day) given for 0 hour TT; epoch is also given in JD.
    The second line contains:
  • mean anomaly,
  • argument of perihelion,
  • longitude of ascending node,
  • inclination to the ecliptic plane,
  • eccentricity,
  • mean daily motion,
  • semimajor axis.
The angular elements are expressed in degrees, mean motion — in degree per day, and great semimajor axis in a.u.
    The third line contains:
  • number of oppositions with observations used for improvement,
  • number of observations used for improvement,
  • the first and the last year of the time interval covered by the observations used for improvement,
  • mean-root-square residual with respect to set of elements fitted by least squares “uncertainty number” U (see Minor Planet Circular 24597,1995 Feb.15), if it is known,
  • perturbations taken into account when determining the initial set of elements and for subsequent numerical integration (M–N in the first three positions stands for perturbations from Mercury to Neptune, P in the fourth position stands for perturbations from Pluto, then c, p, v, e, h in the 5–9th positions stand for perturbations from Ceres, Pallas, Vesta, Eumonia, and Hygiea correspondingly; the 10th position is left for reserve; L in the 11th position means separate perturbations from the Earth and the Moon, R in the 12th positions means relativistics perturbations, 5 in the 13th position stands for DE405 coordinates of perturbing planets; blank in any position of the code means neglecting corresponding perturbations),
  • author of the elements,
  • reference to publication where initial set of elements was first published (IAA stands for Institute of Applied Astronomy of RAS).
    •     A Fortran format statement for reading a record for each planet is

      format(i6,1x,a18,1x,a6,a6,3x,i4,1x,i2,1x,i2,3x,f9.1/
    *7x,4f10.6,f10.8,f11.9,f12.8/
    *6x,i4,i5,1x,a9,a5,1x,i1,1x,a13,1x,a23,a9)

    Opposition dates

         The opposition dates of the numbered minor planets within current year are represented also in tabular form. Apart from opposition date the apparent magnitude for the fourth ephemeris date is given for each planet. A dash indicates that there is no opposition within current year.
         During 2016 minor planets with numbers 3360, 35396, 41429, 175921, 185851, 302831, 308635, 349068, 361538, 363814, 363831, 375054, 382758, 385343, 395207, 411165, 420591, 433953, 452376, 455148, 455795, 455956, 458062 have two oppositions each. The planet with numbers 154244 has three oppositions. For this planet corresponding information are given in several lines.
         The column TE of the Table contains the year of the ephemeris volume in which the orbit was first introduced. A dash in this column indicates that elements of corresponding planet have never yet been published in EMP.

    Ephemerides

         Ephemerides of minor planets, arranged in order of opposition date, are given in the files 2016_02.eph, 2016_03.eph, and 2016_04.eph.
         The following data are tabulated for each planet:

    1. The number and name or principal provisional designation of minor planet, the opposition date, the mean anomaly on the fourth ephemeris date, the minimum value of the phase angle and the date of its occurrence, the year of the most recent astrometric observation. In case the planet is on critical list (not observed during the nearest five years or observed in fewer than four oppositions) the year of the last astrometric observations is followed by symbol C. When it is known that rotational lightcurve variations exceed 0.4 mag, at least on occasion, the ephemeris header is ended in flag R. Where it is known or suspected that aspect variations cause large excursion (>0.4 mag) in the observed magnitude from opposition to opposition the flag A is used rather than R.
    2. Astrometric position (right ascension and declination) for 0 hour TT, referred to the equator and equinox of J2000.0, geocentric and heliocentric distances, the phase angle, and the apparent V magnitude are given for each of eight ephemeris dates, at 10-day interval.


         With possible questions or suggestions please apply at e-mail address: shor@ipa.nw.ru.