Collinder 93

(NGC 2232; MWSC 871; OCL 545; Escorial 8; FoF 2393; OCSN 227)

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0.97 UTI
0.83
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 314
Stellar density (N50/rad) 36.4 [N/pc2]
C3 classification AA
  • CN 0.83 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 93 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Collinder 93 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 96.909 -4.743 3.118 -4.722 -1.766 24.53
Li et al. 2025 96.888 -4.749 3.067 -4.745 -1.84 –
Wei et al. 2025 96.902 -4.745 3.12 -4.703 -1.767 –
Almeida et al. 2025 96.855 -4.712 – – – –
Alfonso et al. 2024 96.949 -5.039 3.041 -4.673 -1.669 –
Zhang et al. 2024 96.978 -4.772 – – – –
Hunt & Reffert 2024 96.978 -4.772 3.12 -4.717 -1.77 22.767
Celli et al. 2024 96.888 -4.749 – – – –
Cavallo et al. 2024 96.838 -4.712 3.118 – – –
Hunt & Reffert 2023 96.978 -4.772 3.12 -4.717 -1.77 22.767
Almeida et al. 2023 96.938 -4.668 – – – –
Qin et al. 2023 96.98 -4.79 3.14 -4.71 -1.77 25.44
Just et al. 2023 96.983 -4.793 – – – –
He et al. 2022 96.559 -3.801 3.115 -4.575 -1.99 –
Jaehnig et al. 2021 96.88 -4.755 3.1 -4.721 -1.833 –
Rain et al. 2021 96.888 -4.749 3.067 -4.745 -1.84 –
Dias et al. 2021 96.855 -4.712 3.075 -4.739 -1.869 25.516
Cantat-Gaudin et al. 2020 96.888 -4.749 3.067 -4.745 -1.84 –
Donor et al. 2020 96.99 -4.795 – 0.13 1.42 81.4
Cantat-Gaudin & Anders 2020 96.888 -4.749 3.067 -4.745 -1.84 –
Liu & Pang 2019 96.9 -4.779 3.071 -4.734 -1.844 –
Soubiran et al. 2018 96.888 -4.749 – – – 25.35
Bica et al. 2019 96.997 -4.763 – – – –
Cantat-Gaudin et al. 2018 96.888 -4.749 3.067 -4.745 -1.84 –
Yen et al. 2018 96.96 -4.792 3.56 -4.62 -1.8 –
Loktin & Popova 2017 96.99 -4.795 – -3.37 -3.1 19.8
Kharchenko et al. 2016 96.983 -4.793 – – – –
Dias et al. 2014 96.812 -4.758 – 0.3 -1.83 –
Kharchenko et al. 2013 96.99 -4.795 – -4.15 -2.43 19.8
Gozha et al. 2012 96.813 -4.758 – – – –
Piskunov et al. 2008 96.97 -4.799 – – – –
Kharchenko et al. 2007 96.81 -4.76 – 0.6 – 19.85
Piskunov et al. 2007 96.97 -4.799 – – – –
van den Bergh 2006 97.008 -4.847 – – – –
Kharchenko et al. 2005 96.97 -4.8 – -4.31 -2.4 16.63
Kharchenko et al. 2003 96.97 -4.8 – -5.27 -1.73 –
Chen et al. 2003 96.657 -4.801 – -4.36 -3.23 20.0
Dias et al. 2002 96.812 -4.758 – -3.37 -3.1 26.6
Dambis 1999 96.812 -4.758 – – – –

💡 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– 0.325 0.09 0.57 31 0.016 159 0.265 0.0
Li et al. 2025 0.31 0.23 – 17 -0.261 – – –
Wei et al. 2025 0.32 0.27 – 15 0.500 204 0.28 –
Almeida et al. 2025 0.32 0.16 – 31 – 159 – –
Alfonso et al. 2024 0.31 0.01 – 26 0.016 – – –
Zhang et al. 2024 – – – – -0.039(1) – – –
Hunt & Reffert 2024 – – – – – 165(1) – –
Celli et al. 2024 – – – 18 – 179 – –
Cavallo et al. 2024 0.33 0.54 – 12 -0.110 – – –
Hunt & Reffert 2023 0.32 0.14 0.57 13 – – – –
Almeida et al. 2023 0.31 0.24 – 28 -0.035 227(1) 0.25 –
Qin et al. 2023 0.36 0.31 – 22 – – – –
Just et al. 2023 – – – 50 – 9 – –
He et al. 2022 – 0.05 – 18 – – – –
Jaehnig et al. 2021 0.32(1) – – – – – – –
Rain et al. 2021 0.32 0.09 – 52 – – – 0
Dias et al. 2021 0.32 0.16 – 31 0.016 – – –
Cantat-Gaudin et al. 2020 0.31 0.01 – 18 – – – –
Donor et al. 2020 – – – – -0.360 – – –
Cantat-Gaudin & Anders 2020 0.32 – – – – – – –
Liu & Pang 2019 – – – 34 0.250 – – –
Soubiran et al. 2018 0.32 – – – – – – –
Cantat-Gaudin et al. 2018 0.32 – – – – – – –
Yen et al. 2018 0.36 0.00 – 105 – – – –
Loktin & Popova 2017 0.37 0.10 – 56 – – – –
Kharchenko et al. 2016 0.33 0.10 – 50 – – – –
Kharchenko et al. 2013 0.33 0.10 – 50 0.320 – – –
Gozha et al. 2012 0.36 – – 53 0.320 102 – –
Piskunov et al. 2008 0.33 0.09 – 31 – 69(1) – –
Piskunov et al. 2007 0.33 0.09 – 31 – 41 – –
van den Bergh 2006 0.36 0.09 – 54 – – – –
Kharchenko et al. 2005 0.33 0.09 – 31 – – – –
Kharchenko et al. 2003 0.32 0.09 – – – – – –
Chen et al. 2003 0.36 – – 50 – – – –
Dias et al. 2002 0.36 0.09 – 53 0.320 – – –
Dambis 1999 0.38 0.07 – 71 – – – –

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

Visualization
ℹī¸
Collinder 93 UCC
Collinder 93 HUNT23
Collinder 93 CANTAT20
Galactocentric position diagram