J/AJ/167/104 Patroclus-Menoetius mutual events season 2024 (Brozovic+, 2024)
Orbit of the Patroclus-Menoetius Binary System and Predictions for the 2024/2025
Mutual Events Season.
Brozovic M., Jacobson R.A., Park R.S., Descamps P., Berthier J.,
Pinilla-Alonso N., Popescu M., Licandro J.
<Astron. J., 167, 104 (2024)>
=2024AJ....167..104B 2024AJ....167..104B
ADC_Keywords: Minor planets ; Solar system
Keywords: Jupiter trojans ; Orbital elements ; Asteroid satellites
Abstract:
We report on the ephemeris development for Menoetius, the satellite of
Patroclus. Our data set consisted of ground-based and Hubble Space
Telescope relative astrometry, as well as 42 lightcurves from the
mutual events seasons in 2007, 2012, and 2017/2018. Our dynamical
model included the effects of oblate, nonspherical shapes of the
components, and we assumed that Menoetius contained ∼22% of the
system's mass. We numerically integrated the equations of motion and
obtained a set of dynamical parameters that fit the data. We report
the fit results in terms of residuals, state vectors, orbital elements
and their 1σ uncertainties. The mean osculating semimajor axis
is a=692.5±4.0km, the mean eccentricity is e=0.004±0.004, and
the International Celestial Reference Frame pole direction in R.A. and
decl. is R.A=178.0±0.5deg, δ=-74.1±0.2deg. We determined
the siderial orbital period of P=4.282753±0.000023days. The fit
yielded the system GM=0.0950±0.0012km3/s2, which, in
combination with the system volume determined from the stellar
occultation and the assumed volume uncertainty of 20%, suggests a
system bulk density of 1.05±0.21g/cm3(1σ). The next season
of mutual events starts in February of 2024 and lasts until January of
2025. The Patroclus system is in opposition for the observers on Earth
in late September and is suitable for observations of the mutual
events with an edge-on geometry in October.
Description:
The data set consists of relative measurements of Menoetius with
respect to Patroclus in the plane of sky (X,Y), and we also have
lightcurves resulting from the system undergoing occultations and
eclipses.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 59 79 Mutual events season 2024 - Superior events
table4.dat 59 79 Mutual events season 2024 - Inferior events
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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 inner Jovian moons (Kulyk+, 2002)
J/A+A/453/349 : CCD positions for 8 Jovian irregular satellites (Veiga, 2006)
J/A+A/580/A76 : Positions of satellites of giant planets (Gomes-Junior+, 2015)
J/AJ/153/147 : Orbits of Jupiter's irregular satellites (Brozovic+, 2017)
J/AJ/163/241 : Residual stats Uranus & Neptune satellites (Brozovic+, 2022)
Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Date Mutual event date (1)
15- 19 A5 --- Start-Time Mutual event starts (1)
21- 25 A5 --- End-Time Mutual event ends (1)
27- 31 A5 --- Event-Max-Time Largest drop in magnitude occurs
33- 59 A27 --- Event(s) Type of the occulting and/or
eclipsing event (2)
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Note (1): Time is given in the UTC
Note (2): The last column lists the sequential type of events that are
occurring as follows:
PO = Partial Occultation;
PE = Partial Eclipse;
PO+PE = Partial Occultation and Partial Eclipse with overlap;
PO_PE = Partial Occultation and Partial Eclipse without overlap;
AO = Annular Occultation;
AO+PE = Annular Occultation and Partial Eclipse with overlap;
AE = Annular Eclipse.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 14-May-2024