Koposov 43

(FSR 0828; MWSC 687; MWSC 688)

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0.73 UTI
0.75
CN
0.38
Cdens
0.75
CC3
0.87
Clit
1.0
Cdup
Nm (P>50%) 113
Core radius and density 1.9 [pc], 1.9 [pc-2]
C3 classification AB
  • CN 0.75 Rich
  • Cdens 0.38 Loose
  • CC3 0.75 High quality
  • Clit 0.87 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Koposov 43 is a rich, loose object of high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is well-studied in the literature.

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

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.94 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.94 (50th percentile), true positive (human-assigned).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.164, e_all=0.0316.

Data
🔍 Search references for Koposov 43 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 88.081 29.901 0.191 -0.078 -1.671 12.029
Li et al. 2025 88.079 29.901 0.18 -0.037 -1.664 –
Hu & Soubiran 2025 88.067 29.906 – – – –
Almeida et al. 2025 88.103 29.89 – – – –
Hunt & Reffert 2024 88.091 29.912 0.204 -0.082 -1.662 12.695
Cavallo et al. 2024 88.067 29.906 0.201 – – –
Hunt & Reffert 2023 88.091 29.912 0.204 -0.082 -1.662 12.695
Almeida et al. 2023 88.09 29.891 – – – –
Just et al. 2023 88.064 29.898 – – – –
Jadhav & Subramaniam 2021 88.079 29.901 – – – –
Dias et al. 2021 88.103 29.89 0.185 -0.026 -1.664 –
Cantat-Gaudin et al. 2020 88.079 29.901 0.18 -0.037 -1.664 –
Zhong et al. 2020 88.079 29.901 – -0.037 -1.664 9.112
Cantat-Gaudin & Anders 2020 88.079 29.901 0.18 -0.037 -1.664 –
Monteiro & Dias 2019 88.061 29.919 – -0.05 -1.665 2.41
Soubiran et al. 2018 88.079 29.901 – – – -2.87
Bica et al. 2019 88.058 29.918 – – – –
Cantat-Gaudin et al. 2018 88.079 29.901 0.18 -0.037 -1.664 –
Dias et al. 2018 – – – 0.09 -3.12 –
Loktin & Popova 2017 88.065 29.919 – -0.094 -1.196 26.6
Sampedro et al. 2017 88.062 29.919 – 1.49 -4.08 –
Kharchenko et al. 2016 88.064 29.898 – – – –
Dias et al. 2014 88.062 29.919 – 1.07 -3.35 –
Kharchenko et al. 2013 88.072 29.897 – 0.53 -5.24 26.6
Kharchenko et al. 2012 88.072 29.897 – 0.53 -5.24 –
Glushkova et al. 2010 88.061 29.919 – – – –
Koposov et al. 2008 88.061 29.919 – – – –
Froebrich et al. 2007 88.075 29.904 – – – –
Dias et al. 2002 88.062 29.919 – 1.07 -3.35 –

💡 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– 4.46 1.65 1.73 1303 -0.309 467 0.76 0
Li et al. 2025 4.67 2.00 – 1190 -0.332 – – –
Hu & Soubiran 2025 – – – – -0.390(5) – – –
Almeida et al. 2025 4.83 2.06 – 1000 – 112 – –
Hunt & Reffert 2024 3.91 1.50 1.73 947 – 1095(1) – –
Cavallo et al. 2024 4.21 1.44 – 2138 -0.170 – – –
Hunt & Reffert 2023 3.91 1.50 1.73 948 – – – –
Almeida et al. 2023 4.66 2.05 – 1096 -0.307 948(1) 0.76 –
Just et al. 2023 – – – 1303 – 467 – –
Jadhav & Subramaniam 2021 4.66 1.41 – 2818 – 337 – 0(1)
Dias et al. 2021 4.83 2.06 – 1000 -0.309 – – –
Cantat-Gaudin et al. 2020 4.66 1.41 – 2818 – – – –
Kounkel et al. 2020 4.05 1.65 – 955 – – – –
Zhong et al. 2020 4.79(1) 2.05 – 9115 -0.493 – – –
Cantat-Gaudin & Anders 2020 4.79 – – – – – – –
Monteiro & Dias 2019 6.19 1.64 – 1156 0.032 – – –
Soubiran et al. 2018 4.79 – – – – – – –
Cantat-Gaudin et al. 2018 4.79 – – – – – – –
Loktin & Popova 2017 4.26 2.23 – 63 – – – –
Kharchenko et al. 2016 3.00 2.05 – 1303 – – – –
Kharchenko et al. 2013 3.00 2.05 – 1303 – – – –
Kharchenko et al. 2012 3.00 2.05 – 1303 – – – –
Glushkova et al. 2010 2.80 1.20 – 1995 – – – –
Koposov et al. 2008 2.80 1.20 – 1995 – – – –
Dias et al. 2002 2.80 1.20 – 1995 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 8594 6.2 88.04 29.76 0.24 0.1 -1.6 59.28 0.02

💡 Note: The % column shows the percentage of members that Koposov 43 shares with each listed object.

Visualization
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Koposov 43 UCC
Koposov 43 HUNT23
Koposov 43 CANTAT20
Galactocentric position diagram