Collinder 421

(MWSC 3328)

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0.90 UTI
0.85
CN
1.0
Cdens
1.0
CC3
0.84
Clit
1.0
Cdup
Nm (P>50%) 357
Core radius and density 1.7 [pc], 6.8 [pc-2]
C3 classification AA
  • CN 0.85 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.84 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 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.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.72 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.72 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2695, e_all=0.25.

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 –
Dias et al. 2018 – – – -3.24 -8.19 –
Dib et al. 2018 305.787 41.695 – – – –
Loktin & Popova 2017 305.79 41.693 – -0.624 -1.576 –
Sampedro et al. 2017 305.792 41.693 – -3.69 -9.03 –
Joshi et al. 2016 305.787 41.695 – – – –
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 –
Lynga 1987 305.816 41.681 – – – –

💡 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 2.02 2.54 224 -0.006 598 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 1.18 2.36 2.54 121 – 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 – – – – – – –
Dib et al. 2018 0.76 – – 1202 – – – –
Loktin & Popova 2017 2.15 2.91 – 141 – – – –
Joshi et al. 2016 0.76 0.98 – 1202 – 19 – –
Kharchenko et al. 2016 0.76 0.98 – 1202 – – – –
Kharchenko et al. 2013 0.76 0.98 – 1202 – – – –
Bukowiecki et al. 2012 – – – – – 256 – –
Bukowiecki et al. 2011 0.90(1) 1.89 – 224 – – – –
Piskunov et al. 2008 0.95 0.32 – 1148 – – – –
Kharchenko et al. 2005 0.95 0.32 – 1148 – – – –
Kharchenko et al. 2003 1.11 0.63 – – – – – –
Dias et al. 2002 1.05 2.02 – 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 0.22

💡 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