Light curves and colours of the faint Uranian irregular satellites
Sycorax, Prospero, Stephano, Setebos, and Trinculo

Maris, M.; Carraro, G.; Parisi, M. G.

doi:10.1051/0004-6361:20066927

Cited by 18 publications

(28 citation statements)

References 33 publications

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“…diameter D and geometric albedo p V . η and D appear to be weakly positively correlated (Table 4), but this may be a consequence of the fact that there is a very strong correlation between r h and D in our sample (itself a target A60, page 6 of 19 Bus et al (1989); (2) Davies et al (1998); (3) Kern et al (2000); (4) Thirouin et al (2010); (5) Ortiz et al (2003); (6) Osip et al (2003); (7) Ortiz et al (2006); (8) Sheppard & Jewitt (2002); (9) Gaudi et al (2005); (10) Dotto et al (2008); (11) Lacerda & Luu (2006); (12) Duffard et al (2008); (13) Rousselot et al (2005a); (14) Hoffmann et al (1992); (15) Farnham (2001); (16) Tegler et al (2005); (17) Sheppard (2007); (18) Romanishin & Tegler (1999); (19) Bauer et al (2004); (20) Miller et al (2011); (21) Maris et al (2007); (22) Rousselot et al (2005b). * Updated value.…”

Section: Qualitative Description Of the η Resultsmentioning

confidence: 99%

“TNOs are Cool”: A survey of the trans-Neptunian region

Lellouch

Santos-Sanz

Lacerda

et al. 2013

A&A

137

143

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Aims. The goal of this work is to characterize the ensemble thermal properties of the Centaurs / trans-Neptunian population. Methods. Thermal flux measurements obtained with Herschel/PACS and Spitzer/MIPS provide size, albedo, and beaming factors for 85 objects (13 of which are presented here for the first time) by means of standard radiometric techniques. The measured beaming factors are influenced by the combination of surface roughness and thermal inertia effects. They are interpreted within a thermophysical model to constrain, in a statistical sense, the thermal inertia in the population and to study its dependence on several parameters. We use in particular a Monte-Carlo modeling approach to the data whereby synthetic datasets of beaming factors are created using random distributions of spin orientation and surface roughness. Results. Beaming factors η range from values <1 to ∼2.5, but high η values (>2) are lacking at low heliocentric distances (r h < 30 AU). Beaming factors lower than 1 occur frequently (39% of the objects), indicating that surface roughness effects are important. We determine a mean thermal inertia for Centaurs/ TNO of Γ = (2.5 ± 0.5) J m −2 s −1/2 K −1 , with evidence of a trend toward decreasing Γ with increasing heliocentric (by a factor ∼2.5 from 8-25 AU to 41-53 AU). These thermal inertias are 2-3 orders of magnitude lower than expected for compact ices, and generally lower than on Saturn's satellites or in the Pluto/Charon system. Most high-albedo objects are found to have unusually low thermal inertias. Our results suggest highly porous surfaces, in which the heat transfer is affected by radiative conductivity within pores and increases with depth in the subsurface.

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Section: Qualitative Description Of the η Resultsmentioning

confidence: 99%

“TNOs are Cool”: A survey of the trans-Neptunian region

Lellouch

Santos-Sanz

Lacerda

et al. 2013

A&A

137

143

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“…We got very similar results in several test cases, therefore we decided to stick to the Lomb-Scargle periods. We note that Maris et al (2007). In the last column 'K2' and '1m' indicates data obtained from the K2 mission and with 1m-telescope of Konkoly Observatory, while 'd' and 's' mark single-peak and double-peak rotation periods.…”

Section: Rotational Characteristics From K2 Measurementsmentioning

confidence: 99%

“…High-quality light curve is available for the largest Jovian irregular, Himalia (Pilcher et al 2012), rotational properties are known for the Jovian satellites Lysithea, Ananke, Carme and Sinope (Luu 1991) and the Cassini spacecraft provided rotation periods for many irregular satellites in the Saturnian system . In the Uranian system, Maris et al (2001Maris et al ( , 2007 performed the investigation of the light curves of irregular satellites and obtained rotational characteristics for Sycorax, Caliban, Prospero and Setebos. However, in these latter cases the results are based on sparsely sampled data due to the observing capabilities of the telescopes and the large distance (hence faintness) of these satellites.…”

Section: Introductionmentioning

confidence: 99%

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Properties of the Irregular Satellite System around Uranus Inferred from K2, Herschel, and Spitzer Observations

Farkas-Takács

Kiss

Pál

et al. 2017

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In this paper we present visible range light curves of the irregular Uranian satellites Sycorax, Caliban, Prospero, Ferdinand and Setebos taken with Kepler Space Telescope in the course of the K2 mission. Thermal emission measurements obtained with the Herschel/PACS and Spitzer/MIPS instruments of Sycorax and Caliban were also analysed and used to determine size, albedo and surface characteristics of these bodies. We compare these properties with the rotational and surface characteristics of irregular satellites in other giant planet systems and also with those of main belt and Trojan asteroids and trans-Neptunian objects. Our results indicate that the Uranian irregular satellite system likely went through a more intense collisional evolution than the irregular satellites of Jupiter and Saturn. Surface characteristics of Uranian irregular satellites seems to resemble the Centaurs and trans-Neptunian objects more than irregular satellites around other giant planets, suggesting the existence of a compositional discontinuity in the young Solar system inside the orbit of Uranus.

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“…22 gives a visual timeline of these events. The model for the time dependent signal produced by a planet in a timeline (Cremonese et al 2002;Maris et al 2007) is:…”

Section: Planet Flux Densitiesmentioning

confidence: 99%

Planck2013 results. V. LFI calibration

Aghanim¹,

Armitage-Caplan²,

Arnaud³

et al. 2014

A&A

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We discuss the methods employed to photometrically calibrate the data acquired by the Low Frequency Instrument on Planck. Our calibration is based on a combination of the orbital dipole plus the solar dipole, caused respectively by the motion of the Planck spacecraft with respect to the Sun and by motion of the solar system with respect to the cosmic microwave background (CMB) rest frame. The latter provides a signal of a few mK with the same spectrum as the CMB anisotropies and is visible throughout the mission. In this data release we rely on the characterization of the solar dipole as measured by WMAP. We also present preliminary results (at 44 GHz only) on the study of the Orbital Dipole, which agree with the WMAP value of the solar system speed within our uncertainties. We compute the calibration constant for each radiometer roughly once per hour, in order to keep track of changes in the detectors' gain. Since non-idealities in the optical response of the beams proved to be important, we implemented a fast convolution algorithm which considers the full beam response in estimating the signal generated by the dipole. Moreover, in order to further reduce the impact of residual systematics due to sidelobes, we estimated time variations in the calibration constant of the 30 GHz radiometers (the ones with the largest sidelobes) using the signal of an internal reference load at 4 K instead of the CMB dipole. We have estimated the accuracy of the LFI calibration following two strategies: (1) we have run a set of simulations to assess the impact of statistical errors and systematic effects in the instrument and in the calibration procedure; and (2) we have performed a number of internal consistency checks on the data and on the brightness temperature of Jupiter. Errors in the calibration of this Planck/LFI data release are expected to be about 0.6% at 44 and 70 GHz, and 0.8% at 30 GHz. Both these preliminary results at low and high are consistent with WMAP results within uncertainties and comparison of power spectra indicates good consistency in the absolute calibration with HFI (0.3%) and a 1.4σ discrepancy with WMAP (0.9%).

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Light curves and colours of the faint Uranian irregular satellites Sycorax, Prospero, Stephano, Setebos, and Trinculo

Cited by 18 publications

References 33 publications

“TNOs are Cool”: A survey of the trans-Neptunian region

“TNOs are Cool”: A survey of the trans-Neptunian region

Properties of the Irregular Satellite System around Uranus Inferred from K2, Herschel, and Spitzer Observations

Planck2013 results. V. LFI calibration

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