NGC 637

(MWSC 133)

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0.95 UTI
0.76
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 124
Radius (P>50% members) 2.2 [arcmin]
  • CN 0.76 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 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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NGC 637 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young 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.
Relatively close Moderate extinction Near-solar metallicity Very young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for NGC 637 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 25.782 64.04 0.345 -1.257 -0.024 –
Li et al. 2025 25.775 64.038 0.338 -1.204 0.026 –
Almeida et al. 2025 25.77 64.037 – – – –
Hunt & Reffert 2024 25.771 64.041 0.343 -1.264 -0.037 –
Cavallo et al. 2024 25.76 64.043 0.345 – – –
Hunt & Reffert 2023 25.771 64.041 0.343 -1.264 -0.037 –
Almeida et al. 2023 25.774 64.041 – – – –
Just et al. 2023 25.766 64.043 – – – –
Jaehnig et al. 2021 25.775 64.039 0.367 -1.222 0.055 –
Rain et al. 2021 25.775 64.038 0.338 -1.204 0.026 –
Dias et al. 2021 25.77 64.037 0.341 -1.212 0.02 –
Cantat-Gaudin et al. 2020 25.775 64.038 0.338 -1.204 0.026 –
Cantat-Gaudin & Anders 2020 25.775 64.038 0.338 -1.204 0.026 –
Cantat-Gaudin et al. 2018 25.775 64.038 0.338 -1.204 0.026 –
Loktin & Popova 2017 25.77 64.04 – -0.143 -0.647 -39.1
Kharchenko et al. 2016 25.766 64.043 – – – –
Dias et al. 2014 25.767 64.04 – -1.28 0.38 –
Kharchenko et al. 2013 25.777 64.045 – -0.25 -2.0 -39.1
Gozha et al. 2012 25.767 64.04 – – – –
Kharchenko et al. 2012 25.777 64.045 – -1.16 -1.7 -39.1
Piskunov et al. 2008 25.753 64.039 – – – –
Kharchenko et al. 2007 25.77 64.04 – 0.1 – -39.1
van den Bergh 2006 25.775 64.033 – – – –
Kharchenko et al. 2005 25.77 64.04 – 0.34 -2.2 -39.1
Kharchenko et al. 2003 25.78 64.05 – 1.06 -2.91 –
Dias et al. 2002 25.767 64.04 – -1.28 0.38 -45.58

💡 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] Bfr BSS
Li et al. 2025 2.33 1.95 – 15 -0.134 – – –
Almeida et al. 2025 2.52 1.92 – 14 – 394 – –
Hunt & Reffert 2024 – – – – – 1259* – –
Cavallo et al. 2024 2.86 1.91 – 18 0.450 – – –
Hunt & Reffert 2023 2.63 1.81 1.02 20 – – – –
Almeida et al. 2023 2.32 1.96 – 18 -0.003 430* 0.54 –
Just et al. 2023 – – – 5 – 220 – –
Jaehnig et al. 2021 2.71* – – – – – – –
Rain et al. 2021 2.73 1.98 – 10 – – – 0
Dias et al. 2021 2.52 1.92 – 14 0.096 – – –
Cantat-Gaudin et al. 2020 2.50 1.67 – 38 – – – –
Cantat-Gaudin & Anders 2020 2.73 – – – – – – –
Cantat-Gaudin et al. 2018 2.73 – – – – – – –
Loktin & Popova 2017 2.18 1.93 – 10 – – – –
Kharchenko et al. 2016 2.30 1.81 – 5 – – – –
Kharchenko et al. 2013 2.30 1.81 – 5 – – – –
Gozha et al. 2012 2.16 – – 10 – 85 – –
Kharchenko et al. 2012 2.50 1.89 – 20 – – – –
Piskunov et al. 2008 2.16 1.89 – 16 – – – –
van den Bergh 2006 2.16 1.95 – 10 – – – –
Kharchenko et al. 2005 2.16 1.89 – 16 – – – –
Kharchenko et al. 2003 2.17 1.86 – – – – – –
Dias et al. 2002 2.50 1.98 – 10 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization
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NGC 637 UCC
NGC 637 HUNT23
NGC 637 CANTAT20
Galactocentric position diagram