Collinder 123

(NGC 2311; MWSC 1035; OCL 553; FSR 1127; FoF 931)

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0.90 UTI
0.76
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 118
Stellar density (N50/rad) 30.9 [N/pc2]
C3 classification AB
  • CN 0.76 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Collinder 123 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a small percentage of members with 2 later reported entries. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Collinder 123 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 104.448 -4.608 0.446 -1.312 0.996 32.108
Almeida et al. 2025 104.464 -4.619 – – – –
Hunt & Reffert 2024 104.447 -4.613 0.445 -1.293 1.024 32.111
Cavallo et al. 2024 104.454 -4.612 0.448 – – –
Hunt & Reffert 2023 104.447 -4.613 0.445 -1.293 1.024 32.111
Almeida et al. 2023 104.475 -4.624 – – – –
Just et al. 2023 104.438 -4.608 – – – –
Jaehnig et al. 2021 104.504 -4.628 0.474 -1.573 0.821 –
Rain et al. 2021 104.455 -4.616 0.462 -1.343 0.93 –
Dias et al. 2021 104.464 -4.619 0.468 -1.348 0.938 –
Cantat-Gaudin et al. 2020 104.455 -4.616 0.462 -1.343 0.93 –
SΓ‘nchez et al. 2020 104.446 -4.612 – -1.356 1.006 –
Donor et al. 2020 104.445 -4.61 – -1.46 0.8 100.5
Cantat-Gaudin & Anders 2020 104.455 -4.616 0.462 -1.343 0.93 –
Liu & Pang 2019 104.487 -4.655 0.464 -1.391 0.862 –
Bica et al. 2019 104.445 -4.602 – – – –
Cantat-Gaudin et al. 2018 104.455 -4.616 0.462 -1.343 0.93 –
Loktin & Popova 2017 104.445 -4.611 – 0.348 0.172 –
Kharchenko et al. 2016 104.438 -4.608 – – – –
Dias et al. 2014 104.446 -4.612 – -1.48 3.31 –
Kharchenko et al. 2013 104.445 -4.61 – -0.85 2.89 –
Piskunov et al. 2008 104.436 -4.607 – – – –
van den Bergh 2006 104.45 -4.617 – – – –
Kharchenko et al. 2005 104.44 -4.61 – -3.2 2.77 –
Kharchenko et al. 2003 104.46 -4.56 – -3.82 3.29 –
Dias et al. 2002 104.446 -4.612 – -1.48 3.31 –

πŸ’‘ 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– 2.04 0.97 0.89 398 -0.045 427 0.47 0.0
Almeida et al. 2025 1.84 1.09 – 60 – 435 – –
Hunt & Reffert 2024 – – – – – 419(1) – –
Cavallo et al. 2024 2.10 0.85 – 100 0.400 – – –
Hunt & Reffert 2023 2.03 0.84 0.89 97 – – – –
Almeida et al. 2023 1.91 1.19 – 63 -0.045 365(1) 0.47 –
Just et al. 2023 – – – 653 – 933 – –
Jaehnig et al. 2021 2.10(1) – – – – – – –
Rain et al. 2021 2.04 1.02 – 398 – – – 0
Dias et al. 2021 1.84 1.09 – 60 -0.079 – – –
Cantat-Gaudin et al. 2020 2.00 1.00 – 45 – – – –
Donor et al. 2020 – – – – -0.320 – – –
Cantat-Gaudin & Anders 2020 2.04 – – – – – – –
Liu & Pang 2019 – – – 8 0.500 – – –
Cantat-Gaudin et al. 2018 2.04 – – – – – – –
Loktin & Popova 2017 3.12 0.97 – 479 – – – –
Kharchenko et al. 2016 2.22 0.64 – 653 – – – –
Kharchenko et al. 2013 2.22 0.64 – 653 – – – –
Piskunov et al. 2008 2.00 0.62 – 398 – – – –
van den Bergh 2006 2.29 1.02 – 398 – – – –
Kharchenko et al. 2005 2.00 0.62 – 398 – – – –
Kharchenko et al. 2003 2.29 0.87 – – – – – –
Dias et al. 2002 2.29 1.02 – 398 – – – –

(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 0365 21.2 104.45 -4.61 0.46 -1.32 1.02 32.11 0.0
HSC 1722 1.7 104.57 -4.75 0.43 -1.76 0.75 – 0.37

πŸ’‘ Note: The % column shows the percentage of members that Collinder 123 shares with each listed object.

Visualization
ℹ️
Collinder 123 UCC
Collinder 123 HUNT23
Collinder 123 CANTAT20
Galactocentric position diagram