Koposov 12

(FSR 0802; MWSC 701; Alessi J0601.6+35b; MWSC 702)

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0.96 UTI
0.79
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 219
Stellar density (N50/rad) 18.2 [N/pc2]
C3 classification AA
  • CN 0.79 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Koposov 12 is a rich, very dense object of very 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 metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a small percentage of members with 2 later reported entries. See table with shared members information.

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 Koposov 12 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 90.25 35.291 0.394 0.648 -1.743 19.666
Li et al. 2025 90.245 35.287 0.396 0.699 -1.732 –
Almeida et al. 2025 90.235 35.295 – – – –
Zhang et al. 2024 90.247 35.266 – – – –
Hunt & Reffert 2024 90.247 35.266 0.401 0.652 -1.742 17.077
Cavallo et al. 2024 90.249 35.301 0.401 – – –
Hunt & Reffert 2023 90.247 35.266 0.401 0.652 -1.742 17.077
Almeida et al. 2023 90.236 35.298 – – – –
Just et al. 2023 90.251 35.277 – – – –
Dias et al. 2021 90.235 35.295 0.409 0.704 -1.711 –
Cantat-Gaudin et al. 2020 90.245 35.287 0.396 0.699 -1.732 –
SΓ‘nchez et al. 2020 90.233 35.277 – 0.748 -1.67 –
Cantat-Gaudin & Anders 2020 90.245 35.287 0.396 0.699 -1.732 –
Bossini et al. 2019 90.245 35.287 – – – –
Soubiran et al. 2018 90.245 35.287 – – – 20.31
Bica et al. 2019 90.261 35.277 – – – –
Cantat-Gaudin et al. 2018 90.245 35.287 0.396 0.699 -1.732 –
Kharchenko et al. 2016 90.251 35.277 – – – –
Dias et al. 2014 90.233 35.277 – 0.44 -1.82 –
Kharchenko et al. 2013 90.261 35.277 – 0.92 -1.8 13.6
Kharchenko et al. 2012 90.261 35.277 – 0.92 -1.8 –
Glushkova et al. 2010 90.234 35.277 – – – –
Koposov et al. 2008 90.234 35.277 – – – –
Froebrich et al. 2007 90.254 35.279 – – – –
Dias et al. 2002 90.233 35.277 – 0.44 -1.82 –

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– 2.1 1.48 0.97 603 0.006 678 0.48 –
Li et al. 2025 2.12 1.34 – 748 0.030 – – –
Almeida et al. 2025 2.06 1.68 – 500 – 506 – –
Zhang et al. 2024 – – – – -0.275(1) – – –
Hunt & Reffert 2024 – – – – – 1702(1) – –
Cavallo et al. 2024 2.43 1.58 – 417 0.500 – – –
Hunt & Reffert 2023 2.28 1.57 0.97 281 – – – –
Almeida et al. 2023 2.10 1.85 – 448 -0.101 851(1) 0.48 –
Just et al. 2023 – – – 813 – 167 – –
Dias et al. 2021 2.06 1.68 – 500 0.012 – – –
Cantat-Gaudin et al. 2020 2.47 1.43 – 389 – – – –
Cantat-Gaudin & Anders 2020 2.35 – – – – – – –
Bossini et al. 2019 2.63 1.53 – 348 0.000 – – –
Soubiran et al. 2018 2.35 – – – – – – –
Cantat-Gaudin et al. 2018 2.35 – – – – – – –
Kharchenko et al. 2016 1.90 1.40 – 813 – – – –
Kharchenko et al. 2013 1.90 1.40 – 813 – – – –
Kharchenko et al. 2012 1.90 1.40 – 813 – – – –
Glushkova et al. 2010 2.05 0.93 – 794 – – – –
Koposov et al. 2008 2.05 0.93 – 794 – – – –
Dias et al. 2002 2.00 1.58 – 603 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 1579 21.0 90.31 35.4 0.49 0.64 -1.74 56.82 0.19
Alessi J0601.6+3531 9.1 90.35 35.5 0.56 0.63 -1.74 26.3 0.27

πŸ’‘ Note: The % column shows the percentage of members that Koposov 12 shares with each listed object.

Visualization
ℹ️
Koposov 12 UCC
Koposov 12 HUNT23
Koposov 12 CANTAT20
Galactocentric position diagram