Koposov 27

(Teutsch 1; MWSC 625; DSH J0539.4+3320; MWSC 624)

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0.90 UTI
0.75
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 106
Radius (P>50% members) 2.0 [arcmin]
C3 classification AB
  • CN 0.75 Rich
  • 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
Koposov 27 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is very well-studied in the literature.
Distant Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Koposov 27 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 84.872 33.346 0.22 0.599 -0.817 -6.88
Almeida et al. 2025 84.871 33.349 – – – –
Zhang et al. 2024 84.873 33.345 – – – –
Hunt & Reffert 2024 84.873 33.345 0.228 0.595 -0.834 14.138
Celli et al. 2024 84.871 33.347 – – – –
Cavallo et al. 2024 84.863 33.353 0.226 – – –
Hunt & Reffert 2023 84.873 33.345 0.228 0.595 -0.834 14.138
Almeida et al. 2023 84.873 33.35 – – – –
Just et al. 2023 84.878 33.359 – – – –
Dias et al. 2021 84.871 33.349 0.211 0.654 -0.756 –
Cantat-Gaudin et al. 2020 84.871 33.347 0.223 0.653 -0.767 –
SΓ‘nchez et al. 2020 84.875 33.35 – 0.721 -1.041 –
Cantat-Gaudin & Anders 2020 84.871 33.347 0.223 0.653 -0.767 –
Bica et al. 2019 84.865 33.342 – – – –
Cantat-Gaudin et al. 2018 84.871 33.347 0.223 0.653 -0.767 –
Kharchenko et al. 2016 84.878 33.359 – – – –
Dias et al. 2014 84.871 33.346 – -0.55 -6.19 –
Kharchenko et al. 2013 84.888 33.358 – 2.75 -3.62 –
Kharchenko et al. 2012 84.888 33.358 – 2.75 -3.62 –
Glushkova et al. 2010 84.875 33.35 – – – –
Koposov et al. 2008 84.875 33.35 – – – –
Kronberger et al. 2006 84.872 33.346 – – – –
Dias et al. 2002 84.875 33.35 – -0.63 -6.44 –

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] Bfrac BSS
UCC 99999– 3.7 2.0 1.85 343 -0.233 314 0.52 –
Almeida et al. 2025 4.07 2.06 – 48 – 234 – –
Zhang et al. 2024 – – – – -0.461(1) – – –
Hunt & Reffert 2024 – – – – – 565(1) – –
Celli et al. 2024 – – – 28 – 378 – –
Cavallo et al. 2024 4.33 1.80 – 60 0.230 – – –
Hunt & Reffert 2023 3.61 1.51 1.85 239 – – – –
Almeida et al. 2023 3.53 2.05 – 46 -0.253 314(1) 0.52 –
Just et al. 2023 – – – 569 – 123 – –
Dias et al. 2021 4.07 2.06 – 48 -0.212 – – –
Cantat-Gaudin et al. 2020 5.32 1.95 – 28 – – – –
Cantat-Gaudin & Anders 2020 3.96 – – – – – – –
Cantat-Gaudin et al. 2018 3.96 – – – – – – –
Kharchenko et al. 2016 2.50 2.33 – 569 – – – –
Kharchenko et al. 2013 2.50 2.33 – 569 – – – –
Kharchenko et al. 2012 2.50 2.33 – 569 – – – –
Glushkova et al. 2010 3.70 1.40 – 447 – – – –
Koposov et al. 2008 3.70 1.40 – 447 – – – –
Dias et al. 2002 3.70 1.40 – 447 – – – –

(N): Indicates that are N extra values assigned to this parameter in the corresponding reference.

Visualization
ℹ️
Koposov 27 UCC
Koposov 27 HUNT23
Koposov 27 CANTAT20
Galactocentric position diagram