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J/AJ/153/147    The orbits of Jupiter's irregular satellites   (Brozovic+, 2017)

The orbits of Jupiter's irregular satellites. Brozovic M., Jacobson R.A. <Astron. J., 153, 147-147 (2017)> =2017AJ....153..147B (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Planets ; Ephemerides Keywords: ephemerides - planets and satellites: general - planets and satellites: individual Jupiter Abstract: We report on the improved ephemerides for the irregular Jovian satellites. We used a combination of numerically integrated equations of motion and a weighted least-squares algorithm to fit the astrometric measurements. The orbital fits for 59 satellites are summarized in terms of state vectors, post-fit residuals, and mean orbital elements. The current data set appears to be sensitive to the mass of Himalia, which is constrained to the range of GM=0.13-0.28 km3/s2. Here, GM is the product of the Newtonian constant of gravitation, G and the body's mass, M. Our analysis of the orbital uncertainties indicates that 11 out of 59 satellites are lost owing to short data arcs. The lost satellites hold provisional International Astronomical Union (IAU) designations and will likely need to be rediscovered. Description: The large majority of astrometric observations originate from Earth-based telescopes, although there are a handful of observations of Himalia and Callirrhoe from the New Horizons spacecraft flyby of Jupiter. The modern Hipparcos Catalog (Perryman et al. 1997A&A...323L..49P) based astrometry is reported as positions in the ICRF. We convert the older measurements to the ICRF positions. The references to optical observations up to the year 2000 are documented in Jacobson (2000AJ....120.2679J). We continued to use the Jacobson (2000AJ....120.2679J) observational biases for the early measurements. We have since extended the data set with observations published in the Minor Planet Electronic Circulars (MPEC), the International Astronomical Union Circulars (IAUC), the Natural Satellites Data Center (NSDC) database (Arlot & Emelyanov 2009A&A...503..631A), the United States Naval Observatory Flagstaff Station catalog, and the Pulkovo Observatory database. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 54 59 Post-fit residual statistics table3.dat 69 177 Jupiter barycentric state vectors at 2010 January 1 TDB referred to the ICRF table5.dat 44 157 Orbital uncertainties in the plane-of-sky, in-orbit, radial, and out-of-plane directions table6.dat 105 60 *Planetocentric mean orbital elements in ecliptic coordinates for 59 irregular jovian satellites table7.dat 73 59 Minimum and maximum values of osculating orbital elements, and their averages over 1000 yr
Note on table6.dat: The epoch for the orbital elements is 2010 January 1 TDB.
See also: J/A+A/311/710 : Faint Jovian satellites ephemerides (Rocher+, 1996) J/A+AS/115/295 : Astrometry of outer Jovian satellites (Hernius+, 1996) J/A+A/383/724 : 1999-2000 CCD observations of inner Jovian moons (Kulyk+, 2002) J/A+A/453/349 : CCD positions for eight Jovian irregular satellites (Veiga, 2006) J/A+A/580/A76 : Positions of satellites of giant planets (Gomes-Junior+, 2015) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Sat Satellite identifier 12- 15 I4 yr b_Time [1894/2011] Time span, lower value 17- 20 I4 yr B_Time [2003/2016]? Time span, upper value 22- 25 I4 --- N1 [8/3257] First number of points used in orbital fit 27- 30 I4 --- N2 [309/3251]? Second number of points used in orbital fit 32- 36 F5.3 arcsec rmsRA [0.118/0.656] rms of the post-fit residuals in Right Ascension (1) 38- 42 F5.3 arcsec rmsDE [0.109/0.679] rms of the post-fit residuals in Declination 44- 48 F5.3 --- sRA [0.395/1.056] Reduced rms of the post-fit residuals in Right Ascension (in σ units) (1) 50- 54 F5.3 --- sDE [0.365/1.138] Reduced rms of the post-fit residuals in Declination (in σ units)
Note (1): All Right Ascension residuals in this manuscript have been scaled with the cosine of declination.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Sat Satellite identifier 19- 43 E25.18 km Pos Position of state vector (1) 45- 69 E25.18 km/s Vel Velocity of state vector (1)
Note (1): These state vectors contain a large number of decimal places and can be used as the starting points in any future numerical integrations.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Sat Satellite identifier 12- 15 A4 yr Year Year center (1) 17- 23 F7.2 arcsec P-S [0.02/1500]? Plane-of-sky uncertainty (2) 25- 31 I7 km In-O [37/5304000]? In-orbit uncertainty (3) 33- 38 I6 km R [15/871400]? Radial uncertainty (3) 40- 44 I5 km Out-P [24/36700]? Out-of-plane uncertainty (3)
Note (1): Mid-epoch of the uncertainty calculation. Note (2): Summed RA and DE. The plane-of-sky uncertainties are the maximum uncertainties for 2009-2011 January, 2019-2021 January, and 2029-2031 January. Note (3): The in-orbit, radial, and out-of-plane are rms of the uncertainties during this time.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1 A1 --- Group [prj] Object group (1) 3- 12 A10 --- Sat Satellite identifier 14- 22 I9 km a Semimajor axis 24- 28 F5.3 --- e [0.045/0.491] Eccentricity 30- 35 F6.2 deg Inc [16.27/168.79] Inclination 37- 42 F6.2 deg lambda [11.2/359.01] Mean longitude λ 44- 49 F6.2 deg omega [3.95/349.72] Longitude of periapsis ω 51- 56 F6.2 deg Omega [1.32/358.58] Longitude of the ascending node Ω 58- 63 F6.4 deg/d dl/dt [0.0831/2.7688] Mean longitude rate dλ/dt 65- 71 F7.2 d Per [130.02/4332.59] Orbital period Pλ 73- 79 F7.4 deg/yr do/dt [-3.1915/1.5737] Rate of apsidal precession dω/dt 81- 87 F7.4 deg/yr dO/dt [-3.191/5.7262] Rate of nodal precession dΩ/dt 89- 93 F5.2 --- nu [-1/1.23]? Ratio of apsidal and nodal precession rates ν (2) 95 A1 --- l_Class [~] Limit flag on Class 96-105 A10 --- Class Classification based on a value of ν (3)
Note (1): Group as follows: p = Satellite in prograde group; r = Satellite in retrograde group; j = The heliocentric mean orbital elements for Jupiter. Note (2): ν=-ω/Ω for prograde and ν=ω/Ω for retrograde. Note (3): The categories are the same as in Cuk & Burns (2004AJ....128.2518C): LK = Lidov-Kozai librators; RC = Reverse circulators; DC = Direct circulators; Non-MS = Non-main-sequence objects; MSC = Main-sequence circulators; SR = Secular resonators.
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Sat Satellite identifier 12- 19 I8 km b_aosc Osculating semimajor axis minimum value 21- 28 I8 km aoscavg Osculating semimajor axis mean value 30- 37 I8 km B_aosc Osculating semimajor axis maximum value 39- 43 F5.3 --- b_eosc [0/0.29] Osculating eccentricity minimum value 45- 49 F5.3 --- eoscavg [0.104/0.485] Osculating eccentricity mean value 51- 55 F5.3 --- B_eosc [0.156/0.701] Osculating eccentricity maximum value 57- 61 F5.1 deg b_iosc [25.5/161] Osculating inclination minimum value 63- 67 F5.1 deg ioscavg [27.7/164.8] Osculating inclination mean value 69- 73 F5.1 deg B_iosc [29.7/168.5] Osculating inclination maximum value
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 22-May-2018
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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