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181. Pulkovo SMP Photographic Catalogue
ID:
ivo://CDS.VizieR/I/321
Title:
Pulkovo SMP Photographic Catalogue
Short Name:
I/321
Date:
21 Oct 2021
Publisher:
CDS
Description:
The results of new reduction of 1545 photographic observations of 14 selected asteroids' obtained with Normal Astrograph of Pulkovo observatory from 1948 to 1990 years presented. Photographic plates, stored in observatory's archive, was digitized using consumer flatbed scanner with special designed technique. The accuracy of measured photoplates was performed. The UCAC3 was used as reference catalog. The analysis of instrumental systematic effects, revealing in common distortion and magnitude equation, was performed and taken into account. The equatorial coordinates of 1378 single observations of selected asteroids was obtained and was made their comparison with results of reduction of this material obtained earlier. 1475 positions of stars with large proper motions from LSPM catalog was measured among background objects.
182. 2007-2016 Pulkovo Uranian satellites obs.
ID:
ivo://CDS.VizieR/J/other/PSS/134.96
Title:
2007-2016 Pulkovo Uranian satellites obs.
Short Name:
J/other/PSS/134.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of the observations of the Uranian satellites made with the 26-inch refractor at the Pulkovo Observatory in 2007-2016. During this time we got 17 normal positions of Ariel, 43 normal positions of Umbriel, 112 normal positions of Titania and 122 normal positions of Oberon. The observations were performed every year from the end of august to the beginning of January. Our results show a good quality of contemporary theories of Uranian satellites' and planets' motion. Published positions of the Uranian satellites can be useful for construction of future theories. Almost 7000 CCD frames were analyzed and reduced using the UCAC4 catalog. Observation processing and coordinate measurement were performed with the IZMCCD software package (izmccd.puldb.ru). Special approach was used to eliminate a scattered halo caused by the bright planet.
183. R absolute magnitudes of Kuiper Belt objects
ID:
ivo://CDS.VizieR/J/A+A/546/A86
Title:
R absolute magnitudes of Kuiper Belt objects
Short Name:
J/A+A/546/A86
Date:
21 Oct 2021
Publisher:
CDS
Description:
Ever since the very first photometric studies of Centaurs and Kuiper belt objects (KBOs) their visible color distribution has been controversial. This controversy has triggered a prolific debate on the origin of the surface colors of these distant icy objects of the solar system. Two scenarios have been proposed to interpret and explain the large variability of colors, hence surface composition. Are the colors mainly primordial and directly related to the formation region, or are they the result of surface evolution processes? To date, no mechanism has been found that successfully explains why Centaurs, which are escapees from the Kuiper belt, exhibit two distinct color groups, whereas KBOs do not. We re-address this issue using a carefully compiled set of B-R colors and H_R{alpha}_ magnitudes (as proxy for size) for 253 objects, including data for 10 new small objects. We find that the bimodal color distribution of Centaurs is a size-related phenomenon, common to both Centaurs and small KBOs, i.e. independent of dynamical classification. Furthermore, we find that large KBOs also have a bimodal distribution of surface colors, albeit distinct from the small objects and strongly dependent on the `Haumea collisional family' objects. When plotted in B-R, H_R{alpha}_ space, the colors of Centaurs and KBOs display a peculiar N shape.
184. R- and I-band photometry of 506 asteroids with CNEOST
ID:
ivo://CDS.VizieR/J/AJ/160/73
Title:
R- and I-band photometry of 506 asteroids with CNEOST
Short Name:
J/AJ/160/73
Date:
09 Mar 2022
Publisher:
CDS
Description:
We initiated the bilateral collaboration between the Lulin Observatory and the Purple Mountain Observatory to collect asteroid lightcurves using the Chinese Near-Earth Object Survey Telescope at the Xuyi Observation Station. The primary goal of this collaboration was to discover super-fast rotators (SFRs) and study their physical properties. Two campaigns have been conducted: (a) a survey of ~45{deg}^2^ using 8minute cadence during 2017 February 26-March 2, and (b) a survey of ~60{deg}^2^ using 10minute cadence during 2018 March 9-12. Our samples are mainly main-belt asteroids and some Hildas and Jupiter Trojans. Out of 4522 collected lightcurves, 506 reliable rotation periods were obtained. Among the reliable rotation periods, we found 16 candidates with a possible rotation period of <2.2hr, in which (134291) 2006 DZ6 shows a very convincing folded lightcurve and the other 15 candidates only have a likely trend. Further confirmation is needed for the rotation periods of these SFR candidates. In addition, (2280) Kunikov seems to have an eclipsing feature on its lightcurve with a relatively long rotation period suggesting that it is likely a fully synchronized binary asteroid. When the preliminary spin-rate distributions were carried out for asteroids using different sizes, no obvious difference was found.
185. R-band K2 photometry of main-belt asteroids
ID:
ivo://CDS.VizieR/J/ApJS/234/37
Title:
R-band K2 photometry of main-belt asteroids
Short Name:
J/ApJS/234/37
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the K2 light curves of a large sample of untargeted main-belt asteroids (MBAs) detected with the Kepler Space Telescope. The asteroids were observed within the Uranus superstamp, a relatively large, continuous field with a low stellar background designed to cover the planet Uranus and its moons during Campaign 8 of the K2 mission. The superstamp offered the possibility of obtaining precise, uninterrupted light curves of a large number of MBAs and thus determining unambiguous rotation rates for them. We obtained photometry for 608 MBAs, and were able to determine or estimate rotation rates for 90 targets, of which 86 had no known values before. In an additional 16 targets we detected incomplete cycles and/or eclipse-like events. We found the median rotation rate to be significantly longer than that of the ground-based observations, indicating that the latter are biased toward shorter rotation rates. Our study highlights the need and benefits of further continuous photometry of asteroids.
186. Reflectance spectra of 12 Trojans and Hildas
ID:
ivo://CDS.VizieR/J/A+A/568/L7
Title:
Reflectance spectra of 12 Trojans and Hildas
Short Name:
J/A+A/568/L7
Date:
21 Oct 2021
Publisher:
CDS
Description:
Hilda asteroids and Jupiter Trojans are two low-albedo (p_v_~0.07) populations for which the Nice model predicts an origin in the primordial Kuiper Belt region. However, recent surveys by WISE and the Spitzer Space Telescope (SST) have revealed that ~2% of these objects possess high albedos (p_v_>=0.15), which might indicate interlopers --that is, objects not formed in the Kuiper Belt-- among these two populations. Here, we report spectroscopic observations in the visible and/or near-infrared spectral ranges of twelve high-albedo (p_v_>0.15) Hilda asteroids and Jupiter Trojans. These twelve objects have spectral properties similar to those of the low-albedo population, which suggests a similar composition and hence a similar origin for low- and high-albedo Hilda asteroids and Jupiter Trojans. We therefore propose that most high albedos probably result from statistical bias or uncertainties that affect the WISE and SST measurements. However, some of the high albedos may be true and the outcome of some collision-induced resurfacing by a brighter material that could include water ice. Future work should attempt to investigate the nature of this supposedly bright material. The lack of interlopers in our sample allows us to set an upper limit of 0.4% at a confidence level of 99.7% on the abundance of interlopers with unexpected taxonomic classes (e.g., A-, S-, V-type asteroids) among these two populations.
187. Resonance sticking in the population of scattering TNOs
ID:
ivo://CDS.VizieR/J/AJ/156/33
Title:
Resonance sticking in the population of scattering TNOs
Short Name:
J/AJ/156/33
Date:
21 Oct 2021
Publisher:
CDS
Description:
A substantial fraction of our solar system's trans-Neptunian objects (TNOs) are in mean-motion resonance with Neptune. Many of these objects were likely caught into resonances by planetary migration-either smooth or stochastic- approximately 4 Gyr ago. Some, however, gravitationally scattered off of Neptune and became transiently stuck in more recent events. Here we use numerical simulations to predict the number of transiently stuck objects, captured from the current actively scattering population, that occupy 111 resonances at semimajor axes a=30-100 au. Our source population is an observationally constrained model of the currently scattering TNOs. We predict that, integrated across all resonances at these distances, the current transient-sticking population comprises 40% of the total transiently stuck+scattering TNOs, suggesting that these objects should be treated as a single population. We compute the relative distribution of transiently stuck objects across all p:q resonances with 1/6=<q/p=<1, p<40, and q<20, providing predictions for the population of transient objects with H_r_<8.66 in each resonance. We find that the relative populations are approximately proportional to each resonance's libration period and confirm that the importance of transient sticking increases with semimajor axis in the studied range. We calculate the expected distribution of libration amplitudes for stuck objects and demonstrate that observational constraints indicate that both the total number and the amplitude distribution of 5:2 resonant TNOs are inconsistent with a population dominated by transient sticking from the current scattering disk. The 5:2 resonance hence poses a challenge for leading theories of Kuiper Belt sculpting.
188. R magnitudes of Kuiper Belt object 2001QG298
ID:
ivo://CDS.VizieR/J/AJ/127/3023
Title:
R magnitudes of Kuiper Belt object 2001QG298
Short Name:
J/AJ/127/3023
Date:
21 Oct 2021
Publisher:
CDS
Description:
Extensive time-resolved observations of Kuiper belt object 2001 QG298 show a light curve with a peak-to-peak variation of 1.14+/-0.04mag and single-peaked period of 6.8872+/-0.0002hr. The mean absolute magnitude is 6.85mag, which corresponds to a mean effective radius of 122(77)km if an albedo of 0.04(0.10) is assumed. This is the first known Kuiper belt object and only the third minor planet with a radius greater than 25km to display a light curve with a range in excess of 1mag. We find the colors to be typical for a Kuiper belt object (B-V=1.00+/-0.04, V-R=0.60+/-0.02), with no variation in color between minimum and maximum light.
189. Rotational properties of TNOs
ID:
ivo://CDS.VizieR/J/A+A/569/A3
Title:
Rotational properties of TNOs
Short Name:
J/A+A/569/A3
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present results for the short-term variability of Binary Trans-Neptunian Objects (BTNOs). We performed CCD photometric observations using the 3.58m Telescopio Nazionale Galileo (TNG), the 1.5m Sierra Nevada Observatory (OSN) telescope, and the 1.23m Centro Astronomico Hispano Aleman (CAHA) telescope at Calar Alto Observatory. We present results based on five years of observations and report the short-term variability of six BTNOs. Our sample contains three classical objects: (174567) 2003 MW_12_, or Varda, (120347) 2004 SB_60_, or Salacia, and 2002 VT_130_; one detached disk object: (229762) 2007 UK_126_; and two resonant objects: (341520) 2007 TY_430_ and (38628) 2000 EB_173_, or Huya. For each target, possible rotational periods and/or photometric amplitudes are reported. We also derived some physical properties from their lightcurves, such as density, primary and secondary sizes, and albedo. We compiled and analyzed a vast lightcurve database for Trans-Neptunian Objects (TNOs) including centaurs to determine the lightcurve amplitude and spin frequency distributions for the binary and non-binary populations. The mean rotational periods, from the Maxwellian fits to the frequency distributions, are 8.63+/-0.52h for the entire sample, 8.37+/-0.58h for the sample without the binary population, and 10.11+/-1.19h for the binary population alone. Because the centaurs are collisionally more evolved, their rotational periods might not be so primordial. We computed a mean rotational period, from the Maxwellian fit, of 8.86+/-0.58h for the sample without the centaur population, and of 8.64+/-0.67h considering a sample without the binary and the centaur populations. According to this analysis, regular TNOs spin faster than binaries, which is compatible with the tidal interaction of the binaries. Finally, we examined possible formation models for several systems studied in this work and by our team in previous papers.
190. Rotation periods from the K2 Campaign 9
ID:
ivo://CDS.VizieR/J/ApJS/255/4
Title:
Rotation periods from the K2 Campaign 9
Short Name:
J/ApJS/255/4
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Kepler mission is a powerful tool for the study of different types of astrophysical objects or events in the distant universe. However, the spacecraft also provides an opportunity to study solar system objects passing in the telescope's field of view. The aim of this paper is to determine, for the first time, the rotation periods of a number of asteroids observed by the K2 satellite during the K2 Campaign 9. Using publicly available data from the Kepler mission, we have used the Modified Causal Pixel Model code to perform the aperture-like and point-response function-like photometry of 1026 asteroids. The results allowed us to determine the rotation periods for 188 asteroids. For asteroids with rotation periods that were previously measured, we compared the results and found very good agreement. There are an additional 20 asteroids for which we obtained lower limits on rotation periods and in all cases these limits are at least 100hr.