Collinder 55

(NGC 1662; MWSC 425; OCL 470; FoF 2368; OCSN 224)

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0.98 UTI
0.88
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 455
Stellar density (N50/rad) 21.5 [N/pc2]
C3 classification AA
  • CN 0.88 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 55 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, below 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.

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: good fit. Isochrone match: good fit.

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Collinder 55 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 72.194 10.889 2.434 -1.149 -1.976 -13.155
Li et al. 2025 72.198 10.882 2.4 -1.128 -1.962 –
Wei et al. 2025 72.175 10.885 2.437 -1.124 -1.965 –
Almeida et al. 2025 72.248 10.857 – – – –
Alfonso et al. 2024 72.194 10.892 2.391 -1.126 -1.965 –
Zhang et al. 2024 72.114 10.904 – – – –
Hunt & Reffert 2024 72.114 10.904 2.439 -1.154 -1.966 -13.257
Cavallo et al. 2024 72.239 10.923 2.437 – – –
Hunt & Reffert 2023 72.114 10.904 2.439 -1.154 -1.966 -13.257
Almeida et al. 2023 72.356 10.852 – – – –
Qin et al. 2023 72.16 10.89 2.43 -1.1 -1.98 -13.73
Just et al. 2023 72.105 10.925 – – – –
He et al. 2022 72.166 10.911 2.437 -1.138 -1.976 –
Tarricq et al. 2022 72.169 10.83 2.434 -1.092 -1.969 –
Jaehnig et al. 2021 72.153 10.879 2.44 -1.154 -1.967 –
Rain et al. 2021 72.198 10.882 2.4 -1.128 -1.962 –
Dias et al. 2021 72.248 10.857 2.405 -1.121 -1.971 -12.372
Cantat-Gaudin et al. 2020 72.198 10.882 2.4 -1.128 -1.962 –
Cantat-Gaudin & Anders 2020 72.198 10.882 2.4 -1.128 -1.962 –
Liu & Pang 2019 72.225 10.993 2.401 -1.124 -1.958 –
Bossini et al. 2019 72.198 10.882 – – – –
Soubiran et al. 2018 72.198 10.882 – – – -13.31
Bica et al. 2019 72.119 10.935 – – – –
Cantat-Gaudin et al. 2018 72.198 10.882 2.4 -1.128 -1.962 –
Loktin & Popova 2017 72.105 10.937 – 0.133 -5.022 -13.5
Kharchenko et al. 2016 72.105 10.925 – – – –
Dias et al. 2014 72.112 10.937 – 0.79 -2.16 –
Kharchenko et al. 2013 72.112 10.925 – -2.5 -2.67 -13.5
Gozha et al. 2012 72.113 10.937 – – – –
Piskunov et al. 2008 72.1 10.945 – – – –
Kharchenko et al. 2007 72.1 10.94 – 0.43 – -13.5
Piskunov et al. 2007 72.1 10.945 – – – –
van den Bergh 2006 72.1 10.933 – – – –
Kharchenko et al. 2005 72.1 10.94 – -3.28 -1.78 –
Kharchenko et al. 2003 72.12 10.93 – -2.94 -1.64 –
Chen et al. 2003 72.126 10.934 – -2.44 -2.83 -13.9
Dias et al. 2002 72.112 10.937 – 0.79 -2.17 -13.35

💡 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– 0.43 0.93 1.41 479 -0.095 244 0.495 0.0
Li et al. 2025 0.38 0.98 – 730 -0.122 – – –
Wei et al. 2025 0.63 1.24 – 275 0.250 433 0.44 –
Almeida et al. 2025 0.41 1.21 – 590 – 445 – –
Alfonso et al. 2024 0.43 0.44 – 1130 -0.098 – – –
Zhang et al. 2024 – – – – -0.034(1) – – –
Hunt & Reffert 2024 – – – – – 495(1) – –
Cavallo et al. 2024 0.42 1.14 – 427 0.350 – – –
Hunt & Reffert 2023 0.39 0.93 1.41 345 – – – –
Almeida et al. 2023 0.39 1.16 – 703 -0.170 397(1) 0.55 –
Qin et al. 2023 0.72 1.43 – 316 – – – –
Just et al. 2023 – – – 495 – 26 – –
He et al. 2022 – 1.45 – 282 – – – –
Tarricq et al. 2022 0.42 – – 813 – – – –
Jaehnig et al. 2021 0.41(1) – – – – – – –
Rain et al. 2021 0.41 0.59 – 891 – – – 0
Dias et al. 2021 0.41 1.21 – 590 -0.100 – – –
Cantat-Gaudin et al. 2020 0.43 0.44 – 776 – – – –
Cantat-Gaudin & Anders 2020 0.41 – – – – – – –
Liu & Pang 2019 – – – 295 0.000 – – –
Bossini et al. 2019 0.37 0.61 – 906 -0.110 – – –
Soubiran et al. 2018 0.41 – – – – – – –
Cantat-Gaudin et al. 2018 0.41 – – – – – – –
Loktin & Popova 2017 0.43 0.95 – 415 – – – –
Kharchenko et al. 2016 0.44 0.93 – 495 – – – –
Kharchenko et al. 2013 0.44 0.93 – 495 -0.095 – – –
Gozha et al. 2012 0.44 – – 422 -0.100 83 – –
Piskunov et al. 2008 0.44 0.93 – 479 – 91(1) – –
Piskunov et al. 2007 0.44 0.93 – 479 – 41 – –
van den Bergh 2006 0.44 0.93 – 417 – – – –
Kharchenko et al. 2005 0.44 0.93 – 479 – – – –
Kharchenko et al. 2003 0.44 0.93 – – – – – –
Chen et al. 2003 0.44 0.94 – 420 -0.090(1) – – –
Dias et al. 2002 0.44 0.94 – 422 -0.095 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14531 23.7 72.18 10.92 2.44 -1.15 -1.95 -13.34 0.0
LP 15 5.5 72.36 10.71 2.46 -1.13 -2.0 -14.26 0.0

💡 Note: The % column shows the percentage of members that Collinder 55 shares with each listed object.

Visualization
ℹī¸
Collinder 55 UCC
Collinder 55 HUNT23
Collinder 55 CANTAT20
Galactocentric position diagram