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 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 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 2000AJ....120.2679J).
We continued to use the Jacobson (2000AJ....120.2679J 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 2009A&A...503..631A), the United States Naval Observatory Flagstaff
Station catalog, and the Pulkovo Observatory database.
File Summary:
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FileName Lrecl Records Explanations
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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
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Note on table6.dat: The epoch for the orbital elements is 2010 January 1 TDB.
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): All Right Ascension residuals in this manuscript have been scaled with
the cosine of declination.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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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)
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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 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.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 22-May-2018