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Start Over Subject astrometry Content Level Research
311. MCXC Meta-Catalogue X-ray galaxy Clusters
ID:
ivo://CDS.VizieR/J/A+A/534/A109
Title:
MCXC Meta-Catalogue X-ray galaxy Clusters
Short Name:
J/A+A/534/A109
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the compilation and properties of a meta-catalogue of X-ray detected clusters of galaxies, the MCXC. This very large catalogue is based on publicly available ROSAT All Sky Survey-based (NORAS, REFLEX, BCS, SGP, NEP, MACS, and CIZA) and serendipitous (160SD, 400SD, SHARC, WARPS, and EMSS) cluster catalogues. Data have been systematically homogenised to an overdensity of 500, and duplicate entries from overlaps between the survey areas of the individual input catalogues are carefully handled. The MCXC comprises 1743 clusters with virtually no duplicate entries. For each cluster the MCXC provides three identifiers, a redshift, coordinates, membership in the original catalogue, and standardised 0.1-2.4keV band luminosity L_500_, total mass M_500_, and radius R_500_. The meta-catalogue additionally furnishes information on overlaps between the input catalogues and the luminosity ratios when measurements from different surveys are available, and gives notes on individual objects.
312. Mean Positions and proper motions of 995 FK4Sup stars
ID:
ivo://CDS.VizieR/I/210
Title:
Mean Positions and proper motions of 995 FK4Sup stars
Short Name:
I/210
Date:
21 Oct 2021
Publisher:
CDS
Description:
This catalogue lists improved mean positions and proper motions for the 995 stars in the FK4 Supplement (Veroeff. Astron. Rechen-Inst. Heidelberg No 11, 1963) which were not included in the Fifth Fundamental Catalogue (Part I: "The Basic FK5", Fricke et al., 1988, Veroeff. Astron. Rechen-Inst. Heidelberg No 32, Catalogue I/149/; Part II: "The FK5 Extension", Fricke et al., 1991, Veroeff. Astron. Rechen-Inst. Heidelberg No 33, Catalogue I/175/). The main purpose of the FK4 Supplement was to stimulate further observations within absolute and differential programs of the stars listed in that catalogue with the aim of their inclusion as new fundamental stars into a future fundamental catalogue. The new fundamental stars should increase the star density without extending the magnitude limit to fainter magnitudes. Since the publication of the "Supplement-Katalog des FK3" (published in Astron-Geodaet. Jahrbuch 1954 and Astron-Geodaet. Jahrbuch 1956) these stars were included in many observing programs. Within work on deriving the FK5 Extension all stars in the FK4 Supplement had been treated in exactly the same way and improved mean positions and proper motions had thus been obtained for all FK4 Sup stars. For more details reference is made to the introduction of the FK5 Extension. FK4 Sup stars with the best astrometric data were included in the FK5 Extension for achieving a homogeneous distribution in magnitude and taking simultaneously into account an even distribution on the sky. This selection process included 992 of the 1987 FK4 Sup stars into the FK5 Extension. Although the astrometric precision of the stars given in the present catalogue is inferior to that of the FK4 Supplement stars included in the FK5 Extension, they deserve being published because a considerable number of observations has been obtained for these stars since about 1955, stimulated by the publication of the FK3 Supplement. The average mean epoch of observation of the stars given is therefore shifted to comparatively modern epochs (see the table in Section 2 of the publication). The astrometric precision of the stars presented here is better than for most other published star positions and proper motions, and the positions and proper motions are the best which could be derived from the available observations. These observations are published in the same catalogues as listed in the FK5, Part II on pages 139 ff. The apparent visual magnitudes are between 3.6 and 7.7 with a concentration around the mean value of 5.94. They are thus within the magnitude limit of the Basic FK5.
313. MEGA-H proper motion catalog
ID:
ivo://CDS.VizieR/V/126
Title:
MEGA-H proper motion catalog
Short Name:
V/126
Date:
21 Oct 2021
Publisher:
CDS
Description:
The catalogue MEGA-H is a result of a merging of star lists from the catalogue of stellar proper motions with respect to galaxies in 47 selected areas near the Main Meridional Section of the Galaxy (MEGA-G) (Kharchenko 1987) and from All-sky Compiled Catalogue of 2.5 Million Stars (ASCC-2.5) (Cat. <I/280>). Proper motions from the catalogue MEGA-G were reduced to the Hipparcos system by means of common with the ASCC-2.5 stars. The compiled proper motions in the Hipparcos system and their standard errors were computed as the weighted means. Equatorial coordinates are reduced to the equinox J2000 and epoch 1991.25. The catalogue MEGA-H contains 18169 stars. Stars are sorted in right ascension J2000 order.
314. Mesure d'etoiles doubles
ID:
ivo://CDS.VizieR/J/A+AS/102/643
Title:
Mesure d'etoiles doubles
Short Name:
J/A+AS/102/643
Date:
21 Oct 2021
Publisher:
CDS
Description:
(no description available)
315. Method for orientation angles of galaxies
ID:
ivo://CDS.VizieR/J/MNRAS/403/1625
Title:
Method for orientation angles of galaxies
Short Name:
J/MNRAS/403/1625
Date:
21 Oct 2021
Publisher:
CDS
Description:
A method is proposed for the determination of the position and inclination angles of the plane of a spiral galaxy based on the assumption that every spiral arm is a monotonic function of the radius against azimuthal angle. This method may yield more accurate results than the more commonly employed isophote method, which is subject to a number of drawbacks. Analytical study, calibration against other methods and examples of application of the proposed method to real galaxies are presented.
316. Methods for CIP and CIO localisation
ID:
ivo://CDS.VizieR/J/A+A/450/855
Title:
Methods for CIP and CIO localisation
Short Name:
J/A+A/450/855
Date:
21 Oct 2021
Publisher:
CDS
Description:
The precession-nutation transformation describes the changing directions on the celestial sphere of the Earth's pole and an adopted origin of right ascension. The coordinate system for the celestial sphere is the geocentric celestial reference system, and the two directions are the celestial intermediate pole (CIP) and the celestial intermediate origin (CIO), the latter having supplanted the equinox for this purpose following IAU resolutions in 2000. The celestial coordinate triad based on the CIP and CIO is called the celestial intermediate reference system; the prediction of topocentric directions additionally requires the Earth rotation angle (ERA), the counterpart of Greenwich sidereal time (GST) in the former equinox based system. The purpose of this paper is to review the different ways of calculating the CIP and CIO directions to precisions of a few microarcseconds over a time span of several centuries, meeting the requirements of high-accuracy applications.
317. 180MHz Murchison Commissioning Survey (MWACS)
ID:
ivo://CDS.VizieR/VIII/98
Title:
180MHz Murchison Commissioning Survey (MWACS)
Short Name:
VIII/98
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Murchison Widefield Array Commissioning Survey (MWACS) is a ~6100deg^2^ 104-196MHz radio sky survey performed with the Murchison Widefield Array during instrument commissioning between 2012 September and 2012 December. The data were taken as meridian drift scans with two different 32-antenna sub-arrays that were available during the commissioning period. The data were combined in the visibility plane before being imaged, and then mosaicked. The survey covers approximately 20.5h<RA<8.5h, -58{deg}<Dec<-14{deg} over three frequency bands centred on 119, 150 and 180MHz. The survey has 3arcmin angular resolution and a typical noise level of 40mJy/beam, with reduced sensitivity near the field boundaries and bright sources. The catalogue consists of flux density and spectral index measurements for 14,110 sources, extracted from the mosaics, 1,247 of which are sub-components of complexes of sources.
318. Micrometer measurements of double stars
ID:
ivo://CDS.VizieR/J/A+AS/143/335
Title:
Micrometer measurements of double stars
Short Name:
J/A+AS/143/335
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report 312 micrometer measurements of 155 visual double stars made with the 50 cm refractor at the Cote D'Azur observatory (Nice, France) and with the 152 cm telescope at Calar Alto observatory (Almeria, Spain).
319. Mimas and Enceladus Cassini ISS astrometry
ID:
ivo://CDS.VizieR/J/A+A/551/A129
Title:
Mimas and Enceladus Cassini ISS astrometry
Short Name:
J/A+A/551/A129
Date:
21 Oct 2021
Publisher:
CDS
Description:
We provide the Cassini ISS astrometric observations of the Saturnian satellites Mimas and Enceladus. The observations were taken over 6 years. Observation residuals were compared to JPL ephemerides SAT317 and SAT351, showing that the observation error is between 3 and 4 kilometers.
320. M 31 new OB associations
ID:
ivo://CDS.VizieR/J/A+A/278/36
Title:
M 31 new OB associations
Short Name:
J/A+A/278/36
Date:
21 Oct 2021
Publisher:
CDS
Description:
A new identification of OB associations in M 31 has been performed using the Path Linkage Criterion technique of Battinelli (1991A&A...244...69B). We found 174 associations with a very small contamination (<5%) by random clumps stars. The expected total number and average size of OB associations in the region of M 31 covered by our data set (Magnier et al., 1992, Cat. <II/208>) are ~280 and ~90pc, respectively. M 31 associations therefore have sizes similar to those of OB associations observed in nearby galaxies, so that we can consider them to be classical OB associations. This list of OB associations will be used for the study of the spatial distribution of OB associations and their correlation with other objects. Taking into account the fact that we do not cover the entire disk of M 31, we extrapolate a total number of associations in M 31 of ~420.