- ID:
- ivo://CDS.VizieR/J/other/P+SS/53.925
- Title:
- CCD photometry of 23 minor planets
- Short Name:
- J/other/PSS/53.9
- Date:
- 14 Dec 2021
- Publisher:
- CDS
- Description:
- We present CCD photometric observations of 23 main-belt asteroids, of which 8 have never been observed before thus the data of these objects are the first in the literature. The majority showed well detectable light variations, exceeding 0.1m. We have determined synodic periods for 756 Lilliana (9.36),1270 Datura (3.4), 1400 Tirela (13.36), 1503 Kuopio (9.98), 3682 Welther (3.59), 7505 Furushu (4.14) and 11436 1969 QR (2.6), while uncertain period estimates were possible for 469 Argentina (12.3), 546 Herodias (10.4) and 1026 Ingrid (5.3). The shape of the lightcurves of 3682 Welther changed on a short time-scale and showed dimmings that might be attributed to eclipses in a binary system. For the remaining objects, only lower limits of the periods and amplitudes were concluded.
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- ID:
- ivo://CDS.VizieR/J/other/ASpR/58.1900
- Title:
- NGC 225 CCD UBV photometry
- Short Name:
- J/other/ASpR/58.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of CCD UBV photometric and spectroscopic observations of the open cluster NGC 225. In order to determine the structural parameters of NGC 225, we calculated the stellar density profile in the cluster's field. We estimated the probabilities of the stars being physical members of the cluster using the existing astrometric data. The most likely members of the cluster were used in the determination of the astrophysical parameters of the cluster. We calculated the mean radial velocity of the cluster as V<SUB>r</SUB>=-8.3±5.0km/s from the optical spectra of eight stars in the cluster's field. Using the U-B vs B-V two-colour diagram and UV excesses of the F-G type main-sequence stars, the reddening and metallicity of NGC 225 were inferred as E(B-V)=0.151±0.047mag and [Fe/H]=-0.11±0.01dex, respectively. We fitted the colour-magnitude diagrams of NGC 225 with the PARSEC isochrones and derived the distance modulus, distance and age of the cluster as Mu<SUB>V</SUB>=9.3±0.07mag, d=585±20pc and t=900±100Myr, respectively. We also estimated the galactic orbital parameters and space velocity components of the cluster and found that the cluster has a slightly eccentric orbit of e=0.07±0.01 and an orbital period of P<SUB>orb</SUB>=255±5Myr.
