NGC 7209

(Melotte 238; Collinder 444; MWSC 3585; OCL 215; FoF 2055)

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0.86 UTI
0.86
CN
0.45
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 395
Core radius and density 4.0 [pc], 2.2 [pc-2]
C3 classification AA
  • CN 0.86 Rich
  • Cdens 0.45 Loose
  • 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¸
NGC 7209 is a rich, loose object of very high C3 quality. Its parallax locates it at a relatively 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 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. Gold sample.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.176, e_all=0.1197.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=8.533, Av=0.546, [Fe/H]=0.070 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108).

Data
🔍 Search references for NGC 7209 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 331.227 46.51 0.817 2.296 0.267 -19.21
Bijavara Seshashayana et al. 2025 331.323 46.524 – – – –
Li et al. 2025 331.224 46.508 0.82 2.255 0.283 –
Wei et al. 2025 331.229 46.49 0.821 2.304 0.278 –
Almeida et al. 2025 331.229 46.495 – – – –
Hunt & Reffert 2024 331.228 46.531 0.816 2.294 0.265 -20.812
Cavallo et al. 2024 331.199 46.505 0.816 – – –
Hunt & Reffert 2023 331.228 46.531 0.816 2.294 0.265 -20.812
Almeida et al. 2023 331.192 46.521 – – – –
Cordoni et al. 2023 331.229 46.495 0.824 2.264 0.292 –
Just et al. 2023 331.22 46.548 – – – –
He et al. 2022 331.241 46.507 0.816 2.298 0.258 –
Tarricq et al. 2022 331.258 46.522 0.811 2.309 0.258 –
Jadhav & Subramaniam 2021 331.224 46.508 – – – –
Jaehnig et al. 2021 331.281 46.508 0.847 2.293 0.313 –
Rain et al. 2021 331.224 46.508 0.82 2.255 0.283 –
Dias et al. 2021 331.229 46.495 0.824 2.264 0.292 -18.188
Cantat-Gaudin et al. 2020 331.224 46.508 0.82 2.255 0.283 –
Cantat-Gaudin & Anders 2020 331.224 46.508 0.82 2.255 0.283 –
Liu & Pang 2019 331.255 46.494 0.819 2.275 0.296 –
Bossini et al. 2019 331.224 46.508 – – – –
Soubiran et al. 2018 331.224 46.508 – – – -18.42
Bica et al. 2019 331.288 46.498 – – – –
Cantat-Gaudin et al. 2018 331.224 46.508 0.82 2.255 0.283 –
Dias et al. 2018 – – – -2.51 -1.68 –
Dib et al. 2018 331.225 46.552 – – – –
Loktin & Popova 2017 331.275 46.483 – -0.416 0.878 -9.7
Sampedro et al. 2017 331.279 46.483 – 0.51 -0.26 –
Joshi et al. 2016 331.225 46.552 – – – –
Kharchenko et al. 2016 331.22 46.548 – – – –
Netopil et al. 2016 331.279 46.483 – – – –
Dias et al. 2014 331.279 46.483 – 0.04 -0.16 –
Kharchenko et al. 2013 331.225 46.552 – -0.97 3.79 -9.7
Gozha et al. 2012 331.279 46.483 – – – –
Kharchenko et al. 2012 331.225 46.552 – -0.97 3.79 -9.7
Bukowiecki et al. 2011 331.242 46.469 – – – –
Piskunov et al. 2008 331.314 46.474 – – – –
Kharchenko et al. 2007 331.27 46.48 – 0.25 – -9.7
Piskunov et al. 2007 331.314 46.474 – – – –
Ahumada & Lapasset 2007 331.275 46.483 – – – –
van den Bergh 2006 331.325 46.483 – – – –
Kharchenko et al. 2005 331.32 46.48 – 2.49 1.62 –
Kharchenko et al. 2003 331.27 46.46 – 2.76 1.04 –
Chen et al. 2003 331.265 46.487 – – – –
Dias et al. 2002 331.279 46.483 – 0.04 -0.16 -18.63
Lynga 1987 331.296 46.49 – – – –
Sulentic et al. 1973 331.3 46.489 – – – –

💡 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– 1.17 0.53 0.56 426 -0.005 591 0.4 0
Bijavara Seshashayana et al. 2025 – 0.53 – 430 -0.010(14) – – –
Li et al. 2025 1.18 0.44 – 541 0.245 – – –
Wei et al. 2025 1.32 0.38 – 550 0.500 1222 0.40 –
Almeida et al. 2025 1.15 0.61 – 494 – 784 – –
Hunt & Reffert 2024 1.17 0.39 0.56 396 – 1250(1) – –
Cavallo et al. 2024 1.22 0.69 – 339 0.200 – – –
Hunt & Reffert 2023 1.17 0.39 0.56 396 – – – –
Almeida et al. 2023 1.18 0.70 – 422 0.048 1087(1) 0.50 –
Cordoni et al. 2023 1.14 0.61 – 494 0.146 1489 0.29 0(1)
Just et al. 2023 – – – 426 – 153 – –
He et al. 2022 – 0.85 – 251 – – – –
Spina et al. 2022 – – – – -0.032 – – –
Tarricq et al. 2022 1.12 – – 457 – – – –
Jadhav & Subramaniam 2021 1.15 0.53 – 427 – 1211 – 0(1)
Jaehnig et al. 2021 1.18(1) – – – – – – –
Rain et al. 2021 1.18 0.54 – 339 – – – 0
Dias et al. 2021 1.15 0.61 – 494 0.146 – – –
Cantat-Gaudin et al. 2020 1.15 0.53 – 427 – – – –
Kounkel et al. 2020 1.10 0.62 – 398 – – – –
Cantat-Gaudin & Anders 2020 1.18 – – – – – – –
Liu & Pang 2019 – – – 525 0.000 – – –
Bossini et al. 2019 1.17 0.55 – 341 0.070 – – –
Soubiran et al. 2018 1.18 – – – – – – –
Cantat-Gaudin et al. 2018 1.18 – – – – – – –
Dib et al. 2018 1.25 – – 426 – – – –
Loktin & Popova 2017 1.20 0.50 – 412 – – – –
Joshi et al. 2016 1.25 0.50 – 426 – 275 – –
Kharchenko et al. 2016 1.25 0.50 – 426 – – – –
Netopil et al. 2016 8.18 – – 350 – – – –
Kharchenko et al. 2013 1.25 0.50 – 426 -0.120 – – –
Bukowiecki et al. 2012 – – – – – 317 – –
Gozha et al. 2012 1.17 – – 414 -0.030 275 – –
Kharchenko et al. 2012 1.25 0.50 – 426 -0.120 – – –
Bukowiecki et al. 2011 1.39(1) 0.35 – 398 – – – –
Paunzen et al. 2010 – – – – -0.030 – – –
Piskunov et al. 2008 1.17 0.50 – 447 – 398(1) – –
Piskunov et al. 2007 1.17 0.50 – 447 – 129 – –
Ahumada & Lapasset 2007 – 0.54 – 417 – – – 0
van den Bergh 2006 1.17 0.54 – 417 – – – –
Kharchenko et al. 2005 1.17 0.50 – 447 – – – –
Kharchenko et al. 2003 1.17 0.54 – – – – – –
Chen et al. 2003 1.17 0.53 – 410 -0.120(1) – – –
Dias et al. 2002 1.17 0.53 – 414 -0.120 – – –
Lynga 1987 0.90 0.63 – 302 – – – –

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

Visualization
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NGC 7209 UCC
NGC 7209 HUNT23
NGC 7209 CANTAT20
Galactocentric position diagram