Collinder 85

(NGC 2186; MWSC 787; OCL 498; FoF 17)

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0.91 UTI
0.78
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 174
Stellar density (N50/rad) 48.9 [N/pc2]
C3 classification AB
  • CN 0.78 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 85 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate 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 metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

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

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Collinder 85 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 93.031 5.45 0.432 0.375 -1.96 43.369
Li et al. 2025 93.031 5.453 0.413 0.415 -1.993 –
Almeida et al. 2025 93.022 5.452 – – – –
Zhang et al. 2024 93.028 5.451 – – – –
Hunt & Reffert 2024 93.028 5.451 0.422 0.383 -1.944 43.378
Cavallo et al. 2024 93.021 5.457 0.426 – – –
Hunt & Reffert 2023 93.028 5.451 0.422 0.383 -1.944 43.378
Just et al. 2023 93.03 5.464 – – – –
Jaehnig et al. 2021 93.031 5.457 0.437 0.423 -1.998 –
Rain et al. 2021 93.031 5.453 0.413 0.415 -1.993 –
Dias et al. 2021 93.022 5.452 0.412 0.405 -1.967 –
Cantat-Gaudin et al. 2020 93.031 5.453 0.413 0.415 -1.993 –
SΓ‘nchez et al. 2020 93.033 5.454 – 0.527 -2.038 –
Cantat-Gaudin & Anders 2020 93.031 5.453 0.413 0.415 -1.993 –
Liu & Pang 2019 93.047 5.462 0.426 0.409 -1.967 –
Soubiran et al. 2018 93.031 5.453 – – – 21.98
Bica et al. 2019 93.035 5.455 – – – –
Cantat-Gaudin et al. 2018 93.031 5.453 0.413 0.415 -1.993 –
Loktin & Popova 2017 93.03 5.454 – 0.168 0.487 20.2
Kharchenko et al. 2016 93.03 5.464 – – – –
Dias et al. 2014 93.033 5.454 – -0.23 -2.79 –
Kharchenko et al. 2013 93.037 5.463 – 0.03 -0.12 20.2
Gozha et al. 2012 93.033 5.454 – – – –
Piskunov et al. 2008 93.021 5.459 – – – –
van den Bergh 2006 93.025 5.467 – – – –
Kharchenko et al. 2005 93.03 5.46 – 1.61 -0.29 –
Kharchenko et al. 2003 93.03 5.46 – 1.57 -0.86 –
Dias et al. 2002 93.033 5.454 – -0.23 -2.79 20.15

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– 2.07 0.82 1.21 158 -0.153 262 – 0.0
Li et al. 2025 2.12 0.88 – 279 -0.071 – – –
Almeida et al. 2025 2.03 1.06 – 149 – 418 – –
Zhang et al. 2024 – – – – -0.297(1) – – –
Hunt & Reffert 2024 – – – – – 674(1) – –
Cavallo et al. 2024 2.15 0.93 – 269 0.000 – – –
Hunt & Reffert 2023 2.11 0.60 1.21 344 – – – –
Just et al. 2023 – – – 158 – 106 – –
Jaehnig et al. 2021 2.29(1) – – – – – – –
Rain et al. 2021 2.26 0.84 – 200 – – – 0
Dias et al. 2021 2.03 1.06 – 149 -0.153 – – –
Cantat-Gaudin et al. 2020 2.25 0.65 – 251 – – – –
Cantat-Gaudin & Anders 2020 2.26 – – – – – – –
Liu & Pang 2019 – – – 933 -0.500 – – –
Soubiran et al. 2018 2.26 – – – – – – –
Cantat-Gaudin et al. 2018 2.26 – – – – – – –
Loktin & Popova 2017 1.71 0.82 – 65 – – – –
Kharchenko et al. 2016 1.45 0.81 – 158 – – – –
Kharchenko et al. 2013 1.45 0.81 – 158 – – – –
Gozha et al. 2012 1.45 – – 200 – 35 – –
Piskunov et al. 2008 1.45 0.81 – 120 – – – –
van den Bergh 2006 1.45 0.84 – 55 – – – –
Kharchenko et al. 2005 1.45 0.81 – 120 – – – –
Kharchenko et al. 2003 1.45 0.68 – – – – – –
Dias et al. 2002 2.70 0.84 – 200 – – – –

(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 0338 14.4 93.05 5.45 0.44 0.36 -1.91 21.69 0.0

πŸ’‘ Note: The % column shows the percentage of members that Collinder 85 shares with each listed object.

Visualization
ℹ️
Collinder 85 UCC
Collinder 85 HUNT23
Collinder 85 CANTAT20
Galactocentric position diagram