Melotte 2

(Collinder 6; NGC 188; MWSC 74; OCL 309; FoF 651)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 1337
Stellar density (N50/rad) 63.2 [N/pc2]
C3 classification AA
  • CN 1.0 Very 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
Melotte 2 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, well above the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, old 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 contains blue stragglers according to at least one source.

Note: This object shares a large 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. Gold sample.

Cavallo et al. (2024)
Gold sample.

Rain et al. (2024)
Well-studied BSSs are distributed across regions intersected by multiple binary evolution tracks, reinforcing the interpretation that many BSSs far from the ZAMS originate from binary evolution.

Data
πŸ” Search references for Melotte 2 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 11.786 85.243 0.525 -2.32 -1.007 -41.837
Nizovkina et al. 2025 11.837 85.251 – – – –
Li et al. 2025 11.798 85.244 0.507 -2.307 -0.96 –
Hu & Soubiran 2025 11.858 85.25 – – – –
Wei et al. 2025 11.729 85.239 0.522 -2.305 -0.962 –
Carrasco-Varela et al. 2025 12.536 85.322 – – – –
Almeida et al. 2025 11.824 85.241 – – – –
Hunt & Reffert 2024 11.837 85.251 0.523 -2.318 -1.015 -41.127
Cavallo et al. 2024 11.858 85.25 0.523 – – –
Rain et al. 2024 11.775 85.243 0.526 -2.322 -1.015 –
Hunt & Reffert 2023 11.837 85.251 0.523 -2.318 -1.015 -41.127
Cordoni et al. 2023 11.824 85.241 0.509 -2.302 -0.955 –
Just et al. 2023 11.821 85.252 – – – –
Jaehnig et al. 2021 11.786 85.244 0.537 -2.308 -0.952 –
Rain et al. 2021 11.798 85.244 0.507 -2.307 -0.96 –
Dias et al. 2021 11.824 85.241 0.509 -2.302 -0.955 -41.602
Cantat-Gaudin et al. 2020 11.798 85.244 0.507 -2.307 -0.96 –
SΓ‘nchez et al. 2020 11.867 85.255 – -2.415 -1.032 –
Donor et al. 2020 11.85 85.255 – -2.33 -0.92 -41.4
Cantat-Gaudin & Anders 2020 11.798 85.244 0.507 -2.307 -0.96 –
Liu & Pang 2019 11.767 85.245 0.508 -2.308 -0.95 –
Bossini et al. 2019 11.798 85.244 – – – –
Soubiran et al. 2018 11.798 85.244 – – – -41.7
Bica et al. 2019 11.943 85.261 – – – –
Cantat-Gaudin et al. 2018 11.798 85.244 0.507 -2.307 -0.96 –
Angelo et al. 2019 12.004 85.246 – – – –
Loktin & Popova 2017 11.865 85.255 – 0.554 -1.476 -45.0
Kharchenko et al. 2016 11.821 85.252 – – – –
Dias et al. 2014 11.867 85.255 – -3.0 -0.37 –
Kharchenko et al. 2013 11.85 85.255 – 0.15 -1.43 -45.0
Gozha et al. 2012 11.867 85.255 – – – –
Kharchenko et al. 2012 11.85 85.255 – 0.11 -1.84 -45.0
Kharchenko et al. 2007 11.86 85.25 – 0.14 – –
van den Bergh 2006 12.108 85.255 – – – –
Chen et al. 2003 11.242 85.35 – -1.48 -0.56 -44.0
Dias et al. 2002 11.867 85.255 – -0.21 0.17 -42.35

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– 1.86 0.25 0.43 4816 0.111 3112 0.48 0.1
Nizovkina et al. 2025 1.76(4) 0.39(4) – 5164(4) -0.093(4) – – –
Li et al. 2025 1.82 0.26 – 6352 0.062 – – –
Hu & Soubiran 2025 – – – – -0.100(5) – – –
Wei et al. 2025 2.00 0.31 – 3550 0.250 1660 0.48 –
Carrasco-Varela et al. 2025 1.86 0.23 – 6194 0.200 – – 0.10(1)
Almeida et al. 2025 1.86 0.23 – 6194 – 3478 – –
Hunt & Reffert 2024 – – – – – 3655(1) – –
Cavallo et al. 2024 1.79 0.32 – 3802 0.180 – – –
Rain et al. 2024 1.74 0.25 – 7904 – 14860 0.33 –
Hunt & Reffert 2023 1.83 0.23 0.43 2630 – – – –
Cordoni et al. 2023 1.86 0.23 – 6194 0.112 1583 0.51 0.06
Just et al. 2023 – – – 4467 – 3112 – –
Jaehnig et al. 2021 1.87(1) – – – – – – –
Rain et al. 2021 1.86 0.11 – 7586 – – – 22
Dias et al. 2021 1.86 0.23 – 6194 0.112 – – –
Cantat-Gaudin et al. 2020 1.70 0.21 – 7079 – – – –
Donor et al. 2020 – – – – 0.090 – – –
Cantat-Gaudin & Anders 2020 1.86 – – – – – – –
Liu & Pang 2019 – – – 4370 0.250 – – –
Bossini et al. 2019 1.67 0.08 – 7534 0.110 – – –
Soubiran et al. 2018 1.86 – – – – – – –
Cantat-Gaudin et al. 2018 1.86 – – – – – – –
Angelo et al. 2019 1.82 – – 7080 – 323 – –
Loktin & Popova 2017 2.10 0.28 – 4130 – – – –
Kharchenko et al. 2016 2.00 0.26 – 4467 – – – –
Kharchenko et al. 2013 2.00 0.26 – 4467 -0.010 – – –
Gozha et al. 2012 2.05 – – 4285 0.120 – – –
Kharchenko et al. 2012 2.00 0.26 – 4467 -0.010 – – –
van den Bergh 2006 2.05 0.25 – 4266 – – – –
Chen et al. 2003 2.05 0.25 – 4280 -0.020(1) – – –
Dias et al. 2002 1.71 0.11 – 7586 0.120 – – –

(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 3252 76.1 11.78 85.24 0.53 -2.32 -1.02 -42.0 0.0

πŸ’‘ Note: The % column shows the percentage of members that Melotte 2 shares with each listed object.

Visualization
ℹ️
Melotte 2 UCC
Melotte 2 HUNT23
Melotte 2 CANTAT20
Galactocentric position diagram