Collinder 446

(NGC 7226; MWSC 3591; OCL 226; FSR 0349)

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0.88 UTI
0.68
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 85
Stellar density (N50/rad) 23.5 [N/pc2]
C3 classification AB
  • CN 0.68 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 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
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Collinder 446 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a large* distance, near 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 parameter (see Parameters). It is very well-studied in the literature.

(*): The parallax distance estimate (~5.94 kpc) differs significantly from the median photometric distance (~4.02 kpc).

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

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Collinder 446 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– 332.602 55.396 0.168 -1.852 -2.086 -72.93
Li et al. 2025 332.605 55.398 0.185 -1.844 -2.065 –
Almeida et al. 2025 332.606 55.399 – – – –
Hunt & Reffert 2024 332.604 55.394 0.175 -1.883 -2.077 -65.511
Cavallo et al. 2024 332.588 55.395 0.173 – – –
Hunt & Reffert 2023 332.604 55.394 0.175 -1.883 -2.077 -65.511
Almeida et al. 2023 332.606 55.395 – – – –
Just et al. 2023 332.596 55.395 – – – –
Dias et al. 2021 332.606 55.399 0.187 -1.838 -2.059 –
Cantat-Gaudin et al. 2020 332.605 55.398 0.185 -1.844 -2.065 –
Cantat-Gaudin & Anders 2020 332.605 55.398 0.185 -1.844 -2.065 –
Soubiran et al. 2018 332.605 55.398 – – – -75.98
Bica et al. 2019 332.62 55.398 – – – –
Cantat-Gaudin et al. 2018 332.605 55.398 0.185 -1.844 -2.065 –
Loktin & Popova 2017 332.61 55.398 – -0.77 -4.41 –
Kharchenko et al. 2016 332.596 55.395 – – – –
Dias et al. 2014 332.608 55.398 – -1.43 -3.41 –
Kharchenko et al. 2013 332.602 55.398 – -2.43 -2.16 –
Kharchenko et al. 2012 332.602 55.398 – -2.43 -2.16 –
van den Bergh 2006 332.625 55.417 – – – –
Dias et al. 2002 332.608 55.398 – -0.77 -4.41 –

💡 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– 4.02 1.66 0.87 482 -0.156 426 0.59 –
Li et al. 2025 4.84 1.56 – 548 0.156 – – –
Almeida et al. 2025 4.02 1.81 – 485 – 408 – –
Hunt & Reffert 2024 – – – – – 889(1) – –
Cavallo et al. 2024 3.39 2.23 – 269 -0.530 – – –
Hunt & Reffert 2023 5.30 1.87 0.87 240 – – – –
Almeida et al. 2023 4.10 1.86 – 390 -0.126 432(1) 0.59 –
Just et al. 2023 – – – 531 – 419 – –
Dias et al. 2021 4.02 1.81 – 485 -0.186 – – –
Cantat-Gaudin et al. 2020 4.51 1.33 – 479 – – – –
Cantat-Gaudin & Anders 2020 4.68 – – – – – – –
Soubiran et al. 2018 4.68 – – – – – – –
Cantat-Gaudin et al. 2018 4.68 – – – – – – –
Loktin & Popova 2017 2.62 1.66 – 273 – – – –
Kharchenko et al. 2016 3.00 1.55 – 531 – – – –
Kharchenko et al. 2013 3.00 1.55 – 531 – – – –
Kharchenko et al. 2012 3.00 1.55 – 531 – – – –
van den Bergh 2006 2.62 1.67 – 275 – – – –
Dias et al. 2002 2.62 1.66 – 273 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0167 44.7 332.6 55.39 0.16 -1.86 -2.09 -72.93 0.0

💡 Note: The % column shows the percentage of members that Collinder 446 shares with each listed object.

Visualization
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Collinder 446 UCC
Collinder 446 HUNT23
Collinder 446 CANTAT20
Galactocentric position diagram