An observation of a mutual event between two satellites of Uranus

  title={An observation of a mutual event between two satellites of Uranus},
  author={Marton G. Hidas and Apostolos A. Christou and T. M. Brown Las Cumbres Observatory Global Telescope and University of Southern California and Santa Barbara and Armagh Observatory},
  journal={Monthly Notices of the Royal Astronomical Society: Letters},
We present observations of the occultation of Umbriel by Oberon on 2007 May 4. We believe this is the first observed mutual event between satellites of Uranus. Fitting a simple geometric model to the light curve, we measure the mid-event time with a precision of 4 s. We assume previously measured values for the albedos of the two satellites, and measure the impact parameter to be 500 ± 80 km. These measurements are more precise than estimates based on current ephemerides for these satellites… Expand

Figures and Tables from this paper

Every 42 years, the Earth and the Sun pass through the plane of the orbits of the main satellites of Uranus. In these occasions, mutual occultations and eclipses between these bodies can be seen fromExpand
Photometric and astrometric analysis of a mutual event between the Uranian satellites Miranda and Oberon
Observations of the predicted occultation between the satellites Miranda and Oberon were performed on 2007 July 30. Data analysis reveals that the predicted magnitude drop for this phenomenon wasExpand
Observational detection of eight mutual eclipses and occultations between the satellites of Uranus
Aims. We carried out observations, with five different instruments ranging in aperture from 0.4 m to 10 m, of the satellites of Uranus during that planet’s 2007 Equinox. Our observations coveredExpand
Observation of an eclipse of U-3 Titania by U-2 Umbriel on December 8, 2007 with ESO-VLT
Context. Equinox occurred on Uranus in 2007, allowing unique observations of mutual events of the satellites that occur every 42 years. On December 8, 2007, we observed an eclipse of Titania U-3 byExpand
Astrometry of the main satellites of Uranus: 18 years of observations
Context. We contribute to developing dynamical models of the motions of Uranus’ main satellites. Aims. We determine accurate positions of the main satellites of Uranus: Miranda, Ariel, Umbriel,Expand
Astrometry of Iapetus, Ariel, Umbriel, and Titania from eclipses and occultations
Abstract Highly accurate astrometric positions obtained from eclipses and occultations of planetary satellites are reported. These measurements may be used to test existing ephemerides, to improveExpand
Mutual approximations between the five main moons of Uranus
Doing high-precision astrometry on Uranus’ moons is currently quite challenging. No probes will orbit the system before 2040. New high-precision mutual phenomena measurements will only occur inExpand
Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007
Context. The photometry of mutual occultations and eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by processing the light curves ofExpand
Astrometric observations of the Uranian satellites with the Faulkes Telescope North in 2007 September
The results of astrometric observations of the main Uranian satellites taken with the Faulkes Telescope North are presented. A median filter algorithm was applied to subtract a scattered-light haloExpand
Resolving dynamic parameters of the August 2007 Titania and Ariel occultations by Umbriel
Abstract We observed the 15 August 2007 occultation of the uranian satellite Titania and the 19 August 2007 occultation of Ariel by Umbriel using the Agile high-speed photometer on the APO 3.5 mExpand


The PHESAT95 catalogue of observations of the mutual events of the Saturnian satellites
In 1994-1996 the Sun and the Earth passed through the equatorial plane of Saturn and therefore through the orbital planes of its main satellites. During this period, phenomena involving seven ofExpand
Astrometry from mutual events of Jovian satellites in 1997
Astrometric results of observations of the mutual events of the Galilean satellites of Jupiter of the PHEMU97 campaign by the Institut de Mecanique Celeste et de Calcul des Ephemerides are presented.Expand
Predictions of the mutual events of the Uranian satellites occurring in 2006–2009
Context. Every 42 years, the Earth and the Sun pass through the equatorial plane of Uranus allowing observations of mutual occultations and eclipses of the main satellites of Uranus. The nextExpand
Mutual events of the uranian satellites 2006–2010
Abstract The upcoming crossing of the Sun and the Earth through the equatorial plane of the planet Uranus presents an opportunity to observe mutual eclipses and occultations of the uranianExpand
Astrometric reduction of lightcurves observed during the PHESAT95 campaign of Saturnian satellites
In this paper, we present astrometric results derived from reduction of 65 lightcurves made in 1995-1996 during the PHESAT95 campaign of observation of Saturnian satellites mutual events. TheseExpand
Astrometry of five major Uranian satellites in 1995-1997 ?
At the oppositions of 1995-1997, a total of 122 CCD frames were taken on the 1.56 m astrometric telescope at the Sheshan station, yielding 864 positions of the major Uranian satellites. TheExpand
Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope
Abstract Photometric properties of 4 rings and 16 satellites of Uranus are presented, based on 41 Hubble Space Telescope images taken in 1997. Up to 25 filters per object covered the wavelength rangeExpand
The masses of Uranus and its major satellites from Voyager tracking data and earth-based Uranian satellite data
Improved values for the masses of the Uranian system and the satellites Ariel, Umbriel, Titania, Oberon, and Miranda are obtained on the basis of an analysis of the Doppler-tracking data andExpand
Radii, shapes, and topography of the satellites of Uranus from limb coordinates
Abstract Limb coordinates are used to find the radii, shapes, and local topography of the five large satellites of Uranus. The technique provides a direct measure of ellipsoidal shapes of satellitesExpand
Mapping the Variegated Surface of Pluto
During the period from 1985 through 1990, Pluto and its satellite Charon underwent a series of transits, eclipses, and occultations, which are collectively called "mutual events." The albedoExpand