Melotte 222

(Collinder 402; NGC 6811; FSR 0228; MWSC 3143; OCL 185; FoF 2201)

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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) 450
Stellar density (N50/rad) 33.3 [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
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Melotte 222 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, above 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.

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Melotte 222 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 294.343 46.374 0.878 -3.352 -8.815 8.017
Nizovkina et al. 2025 294.344 46.364 – – – –
Li et al. 2025 294.34 46.378 0.87 -3.399 -8.812 –
Hu & Soubiran 2025 294.338 46.367 – – – –
Wei et al. 2025 294.335 46.374 0.881 -3.367 -8.821 –
Almeida et al. 2025 294.349 46.373 – – – –
Zhang et al. 2024 294.344 46.364 – – – –
Hunt & Reffert 2024 294.344 46.364 0.879 -3.355 -8.8 7.54
Cavallo et al. 2024 294.338 46.367 0.879 – – –
Hunt & Reffert 2023 294.344 46.364 0.879 -3.355 -8.8 7.54
Almeida et al. 2023 294.389 46.386 – – – –
Cordoni et al. 2023 294.349 46.373 0.872 -3.397 -8.799 –
Just et al. 2023 294.338 46.393 – – – –
He et al. 2022 294.338 46.371 0.88 -3.352 -8.81 –
Tarricq et al. 2022 294.342 46.352 0.882 -3.351 -8.823 –
Jaehnig et al. 2021 294.337 46.385 0.901 -3.386 -8.806 –
Rain et al. 2021 294.34 46.378 0.87 -3.399 -8.812 –
Dias et al. 2021 294.349 46.373 0.872 -3.397 -8.799 7.862
Cantat-Gaudin et al. 2020 294.34 46.378 0.87 -3.399 -8.812 –
SΓ‘nchez et al. 2020 294.321 46.388 – -3.391 -8.656 –
Donor et al. 2020 294.342 46.395 – -3.44 -8.73 8.0
Cantat-Gaudin & Anders 2020 294.34 46.378 0.87 -3.399 -8.812 –
Liu & Pang 2019 294.334 46.371 0.881 -3.376 -8.78 –
Bossini et al. 2019 294.34 46.378 – – – –
Soubiran et al. 2018 294.34 46.378 – – – 7.7
Bica et al. 2019 294.552 46.559 – – – –
Cantat-Gaudin et al. 2018 294.34 46.378 0.87 -3.399 -8.812 –
Loktin & Popova 2017 294.315 46.388 – -4.774 -5.118 6.0
Kharchenko et al. 2016 294.338 46.393 – – – –
Dias et al. 2014 294.321 46.388 – -4.47 -7.63 –
Kharchenko et al. 2013 294.342 46.395 – -5.68 -6.7 6.0
Gozha et al. 2012 294.321 46.388 – – – –
Piskunov et al. 2008 294.314 46.39 – – – –
Kharchenko et al. 2007 294.31 46.39 – 0.3 – 6.05
Piskunov et al. 2007 294.314 46.39 – – – –
Froebrich et al. 2007 294.317 46.341 – – – –
van den Bergh 2006 294.292 46.375 – – – –
Kharchenko et al. 2005 294.31 46.39 – -5.21 -7.45 6.05
Chen et al. 2003 294.462 46.547 – -3.58 -8.19 7.1
Dias et al. 2002 294.321 46.388 – -4.47 -7.63 6.68

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– 1.14 0.4 0.28 778 -0.020 699 0.4 0.0
Nizovkina et al. 2025 1.06(4) 0.32(4) – 1138(4) -0.157(4) – – –
Li et al. 2025 1.07 0.19 – 1104 -0.031 – – –
Hu & Soubiran 2025 – – – – -0.140(5) – – –
Wei et al. 2025 1.55 0.42 – 576 0.500 898 0.40 –
Almeida et al. 2025 1.10 0.21 – 1007 – 699 – –
Zhang et al. 2024 – – – – -0.050(1) – – –
Hunt & Reffert 2024 – – – – – 1136(1) – –
Cavallo et al. 2024 1.15 0.26 – 977 0.230 – – –
Hunt & Reffert 2023 1.08 0.09 0.28 1076 – – – –
Almeida et al. 2023 1.11 0.26 – 1007 -0.021 646(1) 0.45 –
Cordoni et al. 2023 1.10 0.21 – 1007 0.032 797 0.36 0.00
Just et al. 2023 – – – 638 – 106 – –
He et al. 2022 – 0.40 – 891 – – – –
Tarricq et al. 2022 1.13 – – 1096 – – – –
Jaehnig et al. 2021 1.11(1) – – – – – – –
Rain et al. 2021 1.11 0.50 – 617 – – – 0
Dias et al. 2021 1.10 0.21 – 1007 0.032 – – –
Cantat-Gaudin et al. 2020 1.16 0.09 – 1072 – – – –
Donor et al. 2020 – – – – -0.050 – – –
Cantat-Gaudin & Anders 2020 1.11 – – – – – – –
Liu & Pang 2019 – – – 933 0.000 – – –
Bossini et al. 2019 1.14 0.21 – 863 0.000 – – –
Soubiran et al. 2018 1.11 – – – – – – –
Cantat-Gaudin et al. 2018 1.11 – – – – – – –
Loktin & Popova 2017 1.26 0.42 – 693 – – – –
Kharchenko et al. 2016 1.23 0.64 – 638 – – – –
Kharchenko et al. 2013 1.23 0.64 – 638 – – – –
Gozha et al. 2012 1.22 – – 630 – 794 – –
Piskunov et al. 2008 1.24 0.43 – 575 – 378(1) – –
Piskunov et al. 2007 1.24 0.43 – 575 – 80 – –
van den Bergh 2006 1.22 0.50 – 631 – – – –
Kharchenko et al. 2005 1.24 0.43 – 575 – – – –
Chen et al. 2003 1.22 – – 620 – – – –
Dias et al. 2002 1.22 0.50 – 630 -0.020 – – –

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

Visualization
ℹ️
Melotte 222 UCC
Melotte 222 HUNT23
Melotte 222 CANTAT20
Galactocentric position diagram