Collinder 205

(Markarian 18; MWSC 1613; FoF 984; Mrk 18)

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0.91 UTI
0.78
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 192
Radius (P>50% members) 2.8 [arcmin]
  • CN 0.78 Rich
  • 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 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Collinder 205 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is very well-studied in the literature.
Relatively close Moderate extinction Near-solar metallicity Very young

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

Cavallo et al. (2024)
Silver sample.

Data
🔍 Search references for Collinder 205 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 – 135.123 -48.984 0.528 -4.787 3.982 33.817
Almeida et al. 2025 135.091 -48.985 – – – –
Hunt & Reffert 2024 135.124 -48.987 0.543 -4.795 4.006 55.066
Celli et al. 2024 135.119 -48.984 – – – –
Cavallo et al. 2024 135.082 -48.959 0.543 – – –
Hunt & Reffert 2023 135.124 -48.987 0.543 -4.795 4.006 55.066
Almeida et al. 2023 135.065 -48.992 – – – –
Just et al. 2023 135.13 -48.986 – – – –
Jaehnig et al. 2021 135.128 -48.983 0.53 -4.814 3.935 –
Rain et al. 2021 135.119 -48.984 0.483 -4.797 3.918 –
Dias et al. 2021 135.091 -48.985 0.455 -4.67 3.934 –
Cantat-Gaudin et al. 2020 135.119 -48.984 0.483 -4.797 3.918 –
Cantat-Gaudin & Anders 2020 135.119 -48.984 0.483 -4.797 3.918 –
Liu & Pang 2019 135.087 -48.969 0.5 -4.916 3.919 –
Cantat-Gaudin et al. 2018 135.119 -48.984 0.483 -4.797 3.918 –
Kharchenko et al. 2016 135.13 -48.986 – – – –
Dias et al. 2014 135.133 -48.983 – -4.59 4.32 –
Kharchenko et al. 2013 135.135 -48.99 – -3.52 6.88 20.0
Gozha et al. 2012 135.133 -48.983 – – – –
Piskunov et al. 2008 135.127 -48.988 – – – –
Kharchenko et al. 2007 135.13 -48.98 – 0.16 – 20.0
van den Bergh 2006 135.125 -48.983 – – – –
Kharchenko et al. 2005 135.13 -48.99 – -3.65 6.63 20.0
Kharchenko et al. 2003 135.13 -48.99 – -3.96 7.0 –
Chen et al. 2003 135.174 -48.948 – -3.86 6.5 8.5
Dias et al. 2002 135.133 -48.983 – -4.59 4.32 28.18
Dambis 1999 135.133 -48.983 – – – –

💡 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] Bfr BSS
Almeida et al. 2025 1.40 2.51 – 9 – 348 – –
Hunt & Reffert 2024 – – – – – 640* – –
Celli et al. 2024 – – – 5 – 564 – –
Cavallo et al. 2024 1.79 2.09 – 7 0.290 – – –
Hunt & Reffert 2023 1.77 2.71 2.35 3 – – – –
Almeida et al. 2023 1.65 2.56 – 6 0.024 355* 0.72 –
Just et al. 2023 – – – 11 – 40 – –
Jaehnig et al. 2021 1.90* – – – – – – –
Rain et al. 2021 1.95 2.33 – 16 – – – 0
Dias et al. 2021 1.40 2.51 – 9 -0.169 – – –
Cantat-Gaudin et al. 2020 2.40 2.30 – 5 – – – –
Cantat-Gaudin & Anders 2020 1.95 – – – – – – –
Liu & Pang 2019 – – – 8 0.500 – – –
Cantat-Gaudin et al. 2018 1.95 – – – – – – –
Kharchenko et al. 2016 1.46 2.71 – 11 – – – –
Kharchenko et al. 2013 1.46 2.71 – 11 – – – –
Gozha et al. 2012 1.85 – – 16 – 269 – –
Piskunov et al. 2008 1.50 2.39 – 11 – – – –
van den Bergh 2006 1.85 2.33 – 16 – – – –
Kharchenko et al. 2005 1.50 2.39 – 11 – – – –
Kharchenko et al. 2003 1.60 2.17 – – – – – –
Chen et al. 2003 1.85 – – 10 – – – –
Dias et al. 2002 1.85 2.33 – 16 – – – –
Dambis 1999 1.53 2.40 – 3 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization
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Collinder 205 UCC
Collinder 205 HUNT23
Collinder 205 CANTAT20
Galactocentric position diagram