Collinder 251

(VDBH 126; NGC 4052; MWSC 1991; OCL 870; vdBergh-Hagen 126; ESO 094 10; FoF 1123)

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0.96 UTI
0.81
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 257
Stellar density (N50/rad) 19.1 [N/pc2]
C3 classification AA
  • CN 0.81 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very 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 251 is a rich, very dense object of very 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, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

(*): The parallax distance estimate (~2.80 kpc) differs significantly from the median photometric distance (~1.89 kpc).

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Collinder 251 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 180.456 -63.224 0.357 -6.83 0.096 -3.916
Li et al. 2025 180.446 -63.23 0.323 -6.836 0.069 –
Hu & Soubiran 2025 180.46 -63.227 – – – –
Almeida et al. 2025 180.393 -63.231 – – – –
Hunt & Reffert 2024 180.473 -63.229 0.362 -6.819 0.112 -2.839
Cavallo et al. 2024 180.46 -63.227 0.363 – – –
Hunt & Reffert 2023 180.473 -63.229 0.362 -6.819 0.112 -2.839
Just et al. 2023 180.307 -63.211 – – – –
Dias et al. 2021 180.393 -63.231 0.327 -6.836 0.072 -2.607
Cantat-Gaudin et al. 2020 180.446 -63.23 0.323 -6.836 0.069 –
SΓ‘nchez et al. 2020 180.258 -63.225 – -6.809 0.064 –
Cantat-Gaudin & Anders 2020 180.446 -63.23 0.323 -6.836 0.069 –
Liu & Pang 2019 180.486 -63.226 0.35 -6.678 0.152 –
Soubiran et al. 2018 180.446 -63.23 – – – -2.79
Bica et al. 2019 180.507 -63.22 – – – –
Cantat-Gaudin et al. 2018 180.446 -63.23 0.323 -6.836 0.069 –
Loktin & Popova 2017 180.255 -63.224 – -3.48 0.38 –
Kharchenko et al. 2016 180.307 -63.211 – – – –
Dias et al. 2014 180.258 -63.225 – -3.48 0.38 –
Kharchenko et al. 2013 180.315 -63.215 – -7.24 -1.44 –
Piskunov et al. 2008 180.281 -63.22 – – – –
van den Bergh 2006 180.3 -63.217 – – – –
Kharchenko et al. 2005 180.3 -63.22 – -6.63 -1.17 –
Kharchenko et al. 2003 180.52 -63.21 – -7.23 -0.21 –
Dias et al. 2002 180.258 -63.225 – -3.48 0.38 –

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– 1.89 0.5 0.69 313 0.093 570 – –
Li et al. 2025 2.48 0.86 – 482 0.149 – – –
Hu & Soubiran 2025 – – – – -0.280(5) – – –
Almeida et al. 2025 2.32 1.05 – 376 – 570 – –
Hunt & Reffert 2024 – – – – – 1387(1) – –
Cavallo et al. 2024 1.89 0.95 – 741 -0.240 – – –
Hunt & Reffert 2023 2.47 0.88 0.69 218 – – – –
Just et al. 2023 – – – 251 – 55 – –
Dias et al. 2021 2.32 1.05 – 376 0.093 – – –
Cantat-Gaudin et al. 2020 2.61 1.01 – 331 – – – –
Cantat-Gaudin & Anders 2020 2.84 – – – – – – –
Liu & Pang 2019 – – – 576 0.250 – – –
Soubiran et al. 2018 2.84 – – – – – – –
Cantat-Gaudin et al. 2018 2.84 – – – – – – –
Loktin & Popova 2017 1.21 0.48 – 313 – – – –
Kharchenko et al. 2016 1.21 0.48 – 251 – – – –
Kharchenko et al. 2013 1.21 0.48 – 251 – – – –
Piskunov et al. 2008 1.21 0.50 – 251 – – – –
van den Bergh 2006 1.21 0.50 – 316 – – – –
Kharchenko et al. 2005 1.21 0.50 – 251 – – – –
Kharchenko et al. 2003 1.21 0.50 – – – – – –
Dias et al. 2002 1.21 0.48 – 313 – – – –

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

Visualization
ℹ️
Collinder 251 UCC
Collinder 251 HUNT23
Collinder 251 CANTAT20
Galactocentric position diagram