![]() ![]() The estimated age of 1600 ± 180 more » Myr indicates that NGC 4337 is an old open cluster with a bunch of red giant stars. The radial distribution of members provides a cluster radius of 7.′75 (5.63 pc). We find the normal interstellar extinction toward the cluster region. ![]() We provide Python code that allows to perform cone searches, as well as MATLAB code for performing cone searches, catalog cross-matching, general searches, as well as load and create these =. The first released version includes the following catalogs (by alphabetical order): 2MASS, 2MASS extended sources, AKARI, APASS, Cosmos, DECaLS/DR5, FIRST, GAIA/DR1, GAIA/DR2, GALEX/DR6Plus7, HSC/v2, IPHAS/DR2, NED redshifts, NVSS, Pan-STARRS1/DR1, PTF photometric catalog, ROSAT faint source, SDSS sources, SDSS/DR14 spectroscopy, SkyMapper, Spitzer/SAGE, Spitzer/IRAC galactic center, UCAC4, UKIDSS/DR10, VST/ATLAS/DR3, VST/KiDS/DR3, WISE and XMM. Several tools are provided to perform efficient cone searches at resolutions spanning from a few arc-seconds to degrees, within a few milliseconds time. To allow fast access, the catalogs are partitioned into hierarchical triangular meshes and stored in HDF5 files. Here we introduce the catsHTM tool, consisting of several large catalogs reformatted into HDF5-based file format, which can be downloaded and used locally. Observational work in the theme uses large ground-based and satellite telescopes from the radio to the X-ray bands, whilst our theoretical work is tied closely to the interpretation of. Fast access to large catalogs is required for some astronomical applications. The theme is active in several research areas, specialising in cosmology, the formation of clusters and galaxies, active galaxies, high-energy astrophysical processes and the formation of extrasolar planets. ![]()
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