Collinder 421

(MWSC 3328)

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0.97 UTI
0.85
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 357
Stellar density (N50/rad) 24.6 [N/pc2]
C3 classification AA
  • CN 0.85 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Collinder 421 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close 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, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a very small percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Cavallo et al. (2024)
Gold sample.

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

Data
🔍 Search references for Collinder 421 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 305.829 41.693 0.825 -3.639 -8.366 -0.088
Li et al. 2025 305.829 41.701 0.813 -3.651 -8.334 –
Wei et al. 2025 305.84 41.674 0.827 -3.614 -8.317 –
Almeida et al. 2025 305.837 41.703 – – – –
Zhang et al. 2024 305.817 41.695 – – – –
Hunt & Reffert 2024 305.817 41.695 0.831 -3.64 -8.372 0.29
Cavallo et al. 2024 305.843 41.666 0.828 – – –
Hunt & Reffert 2023 305.817 41.695 0.831 -3.64 -8.372 0.29
Almeida et al. 2023 305.864 41.7 – – – –
Just et al. 2023 305.782 41.692 – – – –
He et al. 2022 305.822 41.7 0.828 -3.642 -8.365 –
Tarricq et al. 2022 305.818 41.7 0.824 -3.642 -8.362 –
Dias et al. 2021 305.837 41.703 0.818 -3.651 -8.336 2.537
Cantat-Gaudin et al. 2020 305.829 41.701 0.813 -3.651 -8.334 –
Cantat-Gaudin & Anders 2020 305.829 41.701 0.813 -3.651 -8.334 –
Loktin & Popova 2017 305.79 41.693 – -0.624 -1.576 –
Kharchenko et al. 2016 305.782 41.692 – – – –
Kharchenko et al. 2013 305.787 41.695 – -4.5 -9.15 –
Bukowiecki et al. 2011 305.742 41.681 – – – –
Piskunov et al. 2008 305.812 41.695 – – – –
Kharchenko et al. 2005 305.82 41.7 – -4.63 -9.73 –
Kharchenko et al. 2003 305.82 41.69 – -4.22 -9.86 –
Dias et al. 2002 305.792 41.693 – -3.61 -11.58 –

💡 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– 1.14 1.98 2.54 202 -0.006 612 0.63 –
Li et al. 2025 1.12 2.59 – 180 -0.125 – – –
Wei et al. 2025 1.47 1.95 – 155 0.500 885 0.62 –
Almeida et al. 2025 1.14 2.48 – 35 – 598 – –
Zhang et al. 2024 – – – – -0.144(1) – – –
Hunt & Reffert 2024 – – – – – 1360(1) – –
Cavallo et al. 2024 1.31 2.39 – 148 0.500 – – –
Hunt & Reffert 2023 1.18 2.36 2.54 121 – – – –
Almeida et al. 2023 1.15 2.44 – 71 0.051 626(1) 0.64 –
Just et al. 2023 – – – 1202 – 29 – –
He et al. 2022 – 2.80 – 112 – – – –
Tarricq et al. 2022 1.17 – – 229 – – – –
Dias et al. 2021 1.14 2.48 – 35 -0.063 – – –
Cantat-Gaudin et al. 2020 1.21 1.69 – 234 – – – –
Cantat-Gaudin & Anders 2020 1.19 – – – – – – –
Loktin & Popova 2017 2.15 2.86 – 141 – – – –
Kharchenko et al. 2016 0.76 0.97 – 1202 – – – –
Kharchenko et al. 2013 0.76 0.97 – 1202 – – – –
Bukowiecki et al. 2012 – – – – – 256 – –
Bukowiecki et al. 2011 1.14(1) 1.86 – 224 – – – –
Piskunov et al. 2008 0.95 0.31 – 1148 – – – –
Kharchenko et al. 2005 0.95 0.31 – 1148 – – – –
Kharchenko et al. 2003 1.11 0.62 – – – – – –
Dias et al. 2002 1.05 1.98 – 251 – – – –

(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 142 100.0 305.83 41.69 0.82 -3.64 -8.36 0.77 0.06
Dolidze 9 6.7 306.19 41.94 0.82 -3.68 -8.32 -2.61 0.38

💡 Note: The % column shows the percentage of members that Collinder 421 shares with each listed object.

Visualization
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Collinder 421 UCC
Collinder 421 HUNT23
Collinder 421 CANTAT20
Galactocentric position diagram