The Fifth Catalogue of Nearby Stars (CNS5)

Context. We present the compilation of Fifth Catalogue Nearby Stars (CNS5), based on astrometric and photometric data from Gaia EDR3 H IPPARCOS supplemented with parallaxes ground-based surveys carried out in infrared. Aims. The aim CNS5 is to provide most complete sample objects solar neighbourhood. For all known stars brown dwarfs 25 pc sphere around Sun, basic parameters are given. Furthermore, we colour-magnitude diagram (CMD) various luminosity functions stellar content neighbourhood, characterise completeness catalogue. Methods. compiled a that likely located within taking space-based as well Best et al. (2021, AJ, 161, 42), Kirkpatrick ApJS, 253, 7), CNS4 into account. developed set selection criteria clean spurious sources. show effects blending photometry, which mainly affect faint red sources , can be mitigated reliably place those CMD. also assessed using Kolmogorov-Smirnov test derive observational optical mid-infrared (MIR) for main-sequence white (WDs) Results. contains 5931 objects, including 5230 (4946 stars, 20 giants 264 dwarfs) 701 dwarfs. find catalogue statistically down 19.7 mag G-band 11.8 W1-band absolute magnitudes, corresponding spectral type L8. number density neighbourhood (7.99 ± 0.11) × 10 −2 −3 about 72% M WD pc. derived WDs (4.03 0.25) . ratio between 15 4.6 0.4, whereas it 7.5 0.3. Thus, estimate one third still missing pc, particularly types later than L8 distances close limit.