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201. Visible colors of Centaurs and KBOs
ID:
ivo://CDS.VizieR/J/A+A/577/A35
Title:
Visible colors of Centaurs and KBOs
Short Name:
J/A+A/577/A35
Date:
21 Oct 2021
Publisher:
CDS
Description:
Since the discovery of the Kuiper Belt, broadband surface colors were thoroughly studied as a first approximation to the objects reflectivity spectra. Visible colors (BVRI) have proven to be a reasonable proxy for real spectra, which are rather linear in this range. On the contrary, near-IR colors (JHK bands) could be misleading when absorption features of ices are present in the spectra. Although the physical and chemical information provided by colors are rather limited, broadband photometry remains the best tool for establishing the bulk surface properties of KBOs and Centaurs. In this work, we explore for the first time general, recurrent effects in the study of visible colors that could affect the interpretation of the scientific results: i) how a correlation could be missed or weaken due to the data error bars, ii) the "risk" of missing-out an existing trend due to low sampling, and the possibility to make quantified predictions on the sample size needed to detect a trend at a given significance level, assuming the sample is unbiased, iii) the use of partial correlations to disentangle the mutual effect of two or more (physical) parameters, iv) the sensitivity of the "reddening line" tool to the central wavelength of the filters used. To illustrate and apply these new tools, we have compiled the visible colors and orbital parameters of about 370 objects available in the literature, assumed, by default, as unbiased samples, and carried-out the "traditional" analysis per dynamical family. Our results show in particular how: a) data error-bars impose a limit on the detectable correlations regardless of sample size and, therefore, once that limit is achieved it is important to diminish the error-bars but pointless to enlarge the sampling with the same or larger errors; b) almost all dynamical families still require larger samplings to "ensure" the detection of correlations stronger than +/-0.5, i.e. correlations that may "explain" ~25% or more of the color variability; c) the correlation strength between (V-R) vs. (R-I) is systematically lower than the one between (B-V) vs. (V-R) and not related with error-bar differences between these colors; d) it is statistically equivalent to use any of the different "flavors" of orbital excitation or collisional velocity parameters regarding the famous color-inclination correlation among Classical KBOs --- which no longer evidences to be a strong correlation --- whereas the inclination and Tisserand parameter relative to Neptune cannot be separated from one another; and e) Classical KBOs are the only dynamical family which evidences for neither (B-V) vs. (V-R) nor (V-R) vs. (R-I) correlations, being, therefore, the family with the most unpredictable visible surface reflectivities.
202. VizieR Solar system catalogues
ID:
ivo://CDS.VizieR/B/planets
Title:
VizieR Solar system catalogues
Short Name:
B/planets
Date:
03 Dec 2021 00:36:23
Publisher:
CDS
Description:
The VizieR planetary catalogue EPN-TAP service provides a selection of catalogues containing data related to the Solar System and exoplanets. VizieR (http://vizier.unistra.fr) is a larger service distributing astronomical catalogues related to reviewed papers. Catalogues can be downloaded in TOPCAT (sometimes as multiple tables), the external_link parameter provides access to associated files. This catalogue is the result of a common effort of CDS and ObsParis. The table is conform with EPNcore standard to be queriable throw Europlanet web site (http://www.europlanet-vespa.eu/).
203. VLT/SPHERE/ZIMPOL images of Vesta
ID:
ivo://CDS.VizieR/J/A+A/623/A6
Title:
VLT/SPHERE/ZIMPOL images of Vesta
Short Name:
J/A+A/623/A6
Date:
21 Oct 2021
Publisher:
CDS
Description:
Over the past decades, several interplanetary missions have studied small bodies in situ, leading to major advances in our understanding of their geological and geophysical properties. These missions, however, have had a limited number of targets. Among them, the NASA Dawn mission has characterised in detail the topography and albedo variegation across the surface of asteroid (4) Vesta down to a spatial resolution of ~20m/pixel scale. Here our aim was to determine how much topographic and albedo information can be retrieved from the ground with VLT/SPHERE in the case of Vesta, having a former space mission (Dawn) providing us with the ground truth that can be used as a benchmark. We observed Vesta with VLT/SPHERE/ZIMPOL as part of our ESO large programme (ID 199.C-0074) at six different epochs, and deconvolved the collected images with a parametric point spread function (PSF). We then compared our images with synthetic views of Vesta generated from the 3D shape model of the Dawn mission, on which we projected Vesta's albedo information. We show that the deconvolution of the VLT/SPHERE images with a parametric PSF allows the retrieval of the main topographic and albedo features present across the surface of Vesta down to a spatial resolution of ~20-30km. Contour extraction shows an accuracy of ~1-pixel (3.6mas). The present study provides the very first quantitative estimate of the accuracy of ground-based adaptive-optics imaging observations of asteroid surfaces. In the case of Vesta, the upcoming generation of 30-40m telescopes (ELT, TMT, GMT) should in principle be able to resolve all of the main features present across its surface, including the troughs and the north-south crater dichotomy, provided that they operate at the diffraction limit.
204. VO Solar System Object Ephemeris Generator
ID:
ivo://vopdc.obspm/imcce/miriade
Title:
VO Solar System Object Ephemeris Generator
Short Name:
Miriade
Date:
03 Feb 2017
Publisher:
Paris Astronomical Data Centre - IMCCE
Description:
The Miriade project aims to provide a VO-compliant suite of services to compute positional and physical ephemerides of known solar system bodies as seen from any location on Earth as well as various location in space (HST, SPITZER, Gaia, etc.)
205. V-types Main Set and HED meteorites catalogues
ID:
ivo://CDS.VizieR/J/MNRAS/491/5966
Title:
V-types Main Set and HED meteorites catalogues
Short Name:
J/MNRAS/491/5966
Date:
19 Jan 2022 13:16:47
Publisher:
CDS
Description:
We aim to determine the distribution of basaltic asteroids (classified as V-types) based on the spectrophotometric data reported in the MOVIS-C catalogue. A total of 782 asteroids were identified. The observations with all four filters (Y, J, H, Ks), available for 297 of these candidates, allow a reliable comparison with the laboratory data of howardite, eucrite, and diogenite meteorites. We found that the majority of the basaltic candidates (~95 per cent) are located in the inner main belt, while only 29 (~4 per cent) and 8 (~1 per cent) are located in the middle (MMB) and outer main belt (OMB), respectively. A fraction of ~33 per cent from the V-type candidates is associated with the Vesta family (with respect to AstDyS). We also identified four MMB V-type candidates belonging to (15) Eunomia family, and another four low inclination ones corresponding to (135) Hertha. We report differences between the colour indices and albedo distributions of the V-type candidates located in the inner main belt compared to those from the MMB and OMB. These results support the hypothesis of a different origin for the basaltic asteroids with a semimajor axis beyond 2.5au. Furthermore, lithological differences are present between the vestoids and the inner low inclination basaltic asteroids. The data allow us to estimate the unbiased distribution of basaltic asteroids across the main asteroid belt. We highlight that at least 80 per cent of the ejected basaltic material from (4) Vesta is missing or is not yet detected because it is fragmented in sizes smaller than 1km.
206. Water delivery in Pluto and Triton atmospheres
ID:
ivo://CDS.VizieR/J/A+A/617/L5
Title:
Water delivery in Pluto and Triton atmospheres
Short Name:
J/A+A/617/L5
Date:
21 Oct 2021
Publisher:
CDS
Description:
Both Pluto and Triton possess thin, N_2_-dominated atmospheres controlled by sublimation of surface ices. We aim to constrain the influx and ablation of interplanetary dust grains into the atmospheres of both Pluto and Triton in order to estimate the rate at which oxygen-bearing species are introduced into both atmospheres. We use (i) an interplanetary dust dynamics model to calculate the flux and velocity distributions of interplanetary dust grains relevant for both Pluto and Triton and (ii) a model for the ablation of interplanetary dust grains in the atmospheres of both Pluto and Triton. We sum the individual ablation profiles over the incoming mass and velocity distributions of interplanetary dust grains in order to determine the vertical structure and net deposition of water to both atmospheres. Our results show that <2% of silicate grains ablate at either Pluto or Triton while approximately 75% and >99% of water ice grains ablate at Pluto and Triton, respectively. From ice grains, we calculate net water influxes to Pluto and Triton of ~3.8kg/d (8.5x10^3^H_2_O/cm^2^/s) and ~370kg/d (6.2x10^5^H_2_O/cm^2^/s), respectively. The significant difference in total water deposition between Pluto and Triton is due to the presence of Triton within Neptune's gravity well, which both enhances interplanetary dust particle (IDP) fluxes due to gravitational focusing and accelerates grains before entry into Triton's atmosphere, thereby causing more efficient ablation. We conclude that water deposition from dust ablation plays only a minor role at Pluto due to its relatively low flux. At Triton, water deposition from IDPs is more significant and may play a role in the alteration of atmospheric and ionospheric chemistry. We also suggest that meteoric smoke and smaller, unablated grains may serve as condensation nuclei for the formation of hazes at both worlds.
207. WISE/NEOWISE observations of comets
ID:
ivo://CDS.VizieR/J/AJ/154/53
Title:
WISE/NEOWISE observations of comets
Short Name:
J/AJ/154/53
Date:
21 Oct 2021
Publisher:
CDS
Description:
We use NEOWISE data from the four-band and three-band cryogenic phases of the Wide-field Infrared Survey Explorer mission to constrain size distributions of the comet populations and debias measurements of the short- and long-period comet (LPC) populations. We find that the fit to the debiased LPC population yields a cumulative size-frequency distribution (SFD) power-law slope ({beta}) of -1.0+/-0.1, while the debiased Jupiter-family comet (JFC) SFD has a steeper slope with {beta}=-2.3+/-0.2. The JFCs in our debiased sample yielded a mean nucleus size of 1.3km in diameter, while the LPCs' mean size is roughly twice as large, 2.1km, yielding mean size ratios (<D_LPC_>/<D_JFC_>) that differ by a factor of 1.6. Over the course of the 8 months of the survey, our results indicate that the number of LPCs passing within 1.5 au are a factor of several higher than previous estimates, while JFCs are within the previous range of estimates of a few thousand down to sizes near 1.3km in diameter. Finally, we also observe evidence for structure in the orbital distribution of LPCs, with an overdensity of comets clustered near 110{deg} inclination and perihelion near 2.9 au that is not attributable to observational bias.
208. W1J00 and W2J00 Transit Circle Catalogs
ID:
ivo://CDS.VizieR/I/334
Title:
W1J00 and W2J00 Transit Circle Catalogs
Short Name:
I/334
Date:
21 Oct 2021
Publisher:
CDS
Description:
W1J00. We present the result of observations made with the Six-inch Transit Circle in Washington, D.C., between September 1977 and July 1982. The catalog, called W1J00, contains mean positions of 7267 stars, all but five are north of -30 degrees declination, and 4383 observations of solar system objects. Positions of stars are for mean epoch of observation, on equator and equinox J2000.0. Positions of solar system objects are apparent places. Error estimates are about 100mas per coordinate for the majority of stars. W2J00. We present the result of observations made with the Six-inch Transit Circle in Washington, D.C. and the Seven-inch Transit Circle at the Black Birch station near Blenheim, New Zealand between April 1985 and February 1996. The catalog, called W2J00, contains mean positions of 44,395 globally distributed stars, 5048 observations of the planets, and 6518 observations of the brighter minor planets. Positions of stars are for mean epoch of observation, on equator and equinox J2000.0. Positions of solar system objects are apparent places. Error estimates are about 75mas per coordinate for the majority of stars.