Basel 18

(MWSC 2122)

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0.83 UTI
0.42
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 42
Radius (P>50% members) 2.5 [arcmin]
  • CN 0.42 Poorly populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Basel 18 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.
Relatively close Moderate extinction Near-solar metallicity Young

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Basel 18 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 201.967 -62.304 0.536 -5.048 -2.03 -33.559
Li et al. 2025 201.967 -62.306 0.508 -5.008 -2.05 –
Wei et al. 2025 202.171 -62.399 0.555 -5.044 -1.969 –
Almeida et al. 2025 201.984 -62.309 – – – –
Hunt & Reffert 2024 201.949 -62.303 0.545 -5.06 -1.987 -15.735
Celli et al. 2024 201.967 -62.306 – – – –
Cavallo et al. 2024 201.983 -62.373 0.544 – – –
Hunt & Reffert 2023 201.949 -62.303 0.545 -5.06 -1.987 -15.735
Almeida et al. 2023 202.02 -62.307 – – – –
Just et al. 2023 201.957 -62.327 – – – –
Dias et al. 2021 201.984 -62.309 0.516 -5.01 -2.061 –
Cantat-Gaudin et al. 2020 201.967 -62.306 0.508 -5.008 -2.05 –
SΓ‘nchez et al. 2020 201.933 -62.313 – -5.079 -2.008 –
Cantat-Gaudin & Anders 2020 201.967 -62.306 0.508 -5.008 -2.05 –
Dias et al. 2019 201.933 -62.313 0.526 -5.063 -2.081 12.24
Cantat-Gaudin et al. 2018 201.967 -62.306 0.508 -5.008 -2.05 –
Loktin & Popova 2017 201.93 -62.313 – -7.031 0.169 -22.0
Kharchenko et al. 2016 201.957 -62.327 – – – –
Dias et al. 2014 201.933 -62.313 – -7.52 -3.13 0.3
Kharchenko et al. 2013 201.967 -62.33 – -5.76 -4.63 -22.0
Piskunov et al. 2008 202.001 -62.351 – – – –
van den Bergh 2006 202.025 -62.35 – – – –
Kharchenko et al. 2005 202.02 -62.35 – -5.31 -5.38 –
Kharchenko et al. 2003 201.94 -62.33 – -8.94 -6.07 –
Dias et al. 2002 201.933 -62.313 – -7.52 -3.13 0.3

πŸ’‘ Note: The UCC values are estimated from its identified members.

Reference Year Dist [kpc] Av [mag] DAv [mag] Age [Myr] [Fe/H] [dex] Mass [Msun] Bfr BSS
Li et al. 2025 1.65 0.96 – 26 0.021 – – –
Wei et al. 2025 1.60 0.72 – 105 -0.250 532 0.38 –
Almeida et al. 2025 1.80 1.11 – 21 – 254 – –
Hunt & Reffert 2024 – – – – – 344* – –
Celli et al. 2024 – – – 28 – 212 – –
Cavallo et al. 2024 1.53 0.69 – 91 -0.310 – – –
Hunt & Reffert 2023 1.76 0.91 0.96 32 – – – –
Almeida et al. 2023 1.72 1.15 – 24 0.094 362* 0.62 –
Just et al. 2023 – – – 83 – 575 – –
Dias et al. 2021 1.80 1.11 – 21 0.244 – – –
Cantat-Gaudin et al. 2020 1.86 0.65 – 28 – – – –
Cantat-Gaudin & Anders 2020 1.86 – – – – – – –
Dias et al. 2019 1.87 0.90 – 17 0.051 – – –
Cantat-Gaudin et al. 2018 1.86 – – – – – – –
Loktin & Popova 2017 2.19 1.61 – 38 – – – –
Kharchenko et al. 2016 2.23 1.58 – 83 – – – –
Kharchenko et al. 2013 2.23 1.58 – 83 0.043 – – –
Piskunov et al. 2008 2.23 1.58 – 83 – – – –
van den Bergh 2006 2.23 1.61 – 39 – – – –
Kharchenko et al. 2005 2.23 1.58 – 83 – – – –
Kharchenko et al. 2003 2.23 1.61 – – – – – –
Dias et al. 2002 2.23 1.60 – 39 0.043 – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization
ℹ️
Basel 18 UCC
Basel 18 HUNT23
Basel 18 CANTAT20
Galactocentric position diagram