NGC 225

(Collinder 7; MWSC 68; OCL 305)

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0.87 UTI
0.76
CN
0.59
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 121
Core radius and density 1.8 [pc], 2.9 [pc-2]
C3 classification AA
  • CN 0.76 Rich
  • Cdens 0.59 Moderately dense
  • 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
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NGC 225 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a close distance, near 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 age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P160, along with HSC_977.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Richer et al. (2021)
The expected number of WDs is 5.1, 0 WD candidates found, and 0 WD candidates found in the wide search.

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2995, e_all=0.3368.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=8.254, Av=0.821, [Fe/H]=0.080 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108).

Data
🔍 Search references for NGC 225 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 99999– 10.858 61.776 1.444 -5.34 -0.172 -11.742
Li et al. 2025 10.805 61.774 1.432 -5.373 -0.093 –
Yang et al. 2025 10.981 61.793 – – – –
Almeida et al. 2025 10.777 61.778 – – – –
Alfonso et al. 2024 10.688 61.833 1.413 -5.32 -0.206 –
Hunt & Reffert 2024 10.981 61.793 1.437 -5.361 -0.243 -11.634
Cavallo et al. 2024 9.819 61.926 1.44 – – –
Hunt & Reffert 2023 10.981 61.793 1.437 -5.361 -0.243 -11.634
Almeida et al. 2023 10.824 61.791 – – – –
Just et al. 2023 10.789 61.779 – – – –
He et al. 2022 10.82 61.795 1.453 -5.343 -0.195 –
Tarricq et al. 2022 10.746 61.773 1.428 -5.349 -0.246 –
Jaehnig et al. 2021 10.929 61.812 1.45 -5.329 -0.131 –
Rain et al. 2021 10.805 61.774 1.432 -5.373 -0.093 –
Richer et al. 2021 10.991 61.817 1.434 -5.313 -0.114 –
Dias et al. 2021 10.777 61.778 1.428 -5.4 -0.079 -1.478
Cantat-Gaudin et al. 2020 10.805 61.774 1.432 -5.373 -0.093 –
Cantat-Gaudin & Anders 2020 10.805 61.774 1.432 -5.373 -0.093 –
Bossini et al. 2019 10.805 61.774 – – – –
Soubiran et al. 2018 10.805 61.774 – – – -4.12
Bica et al. 2019 10.888 61.787 – – – –
Cantat-Gaudin et al. 2018 10.805 61.774 1.432 -5.373 -0.093 –
Dias et al. 2018 – – – -2.4 -1.21 –
Dib et al. 2018 10.8 61.782 – – – –
Loktin & Popova 2017 10.92 61.775 – -2.822 -2.387 -28.0
Sampedro et al. 2017 10.912 61.775 – -1.12 -0.25 –
Joshi et al. 2016 10.8 61.782 – – – –
Kharchenko et al. 2016 10.789 61.779 – – – –
Dias et al. 2014 10.912 61.775 – -1.23 -0.06 –
Kharchenko et al. 2013 10.8 61.782 – -3.09 -0.75 -28.0
Gozha et al. 2012 10.912 61.775 – – – –
Kharchenko et al. 2012 10.8 61.782 – -3.09 -0.75 -28.0
Piskunov et al. 2008 10.91 61.778 – – – –
Kharchenko et al. 2007 10.92 61.78 – 0.2 – -28.0
Ahumada & Lapasset 2007 10.9 61.767 – – – –
van den Bergh 2006 10.925 61.783 – – – –
Kharchenko et al. 2005 10.92 61.78 – -3.18 1.99 -28.0
Kharchenko et al. 2003 10.87 61.79 – -2.9 1.32 –
Dias et al. 2002 10.912 61.775 – -1.23 -0.06 -28.0
Lynga 1987 10.868 61.777 – – – –
Sulentic et al. 1973 10.868 61.787 – – – –

💡 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– 0.68 0.86 1.1 155 0.143 72 0.43 0
Li et al. 2025 0.64 0.85 – 127 0.044 – – –
Yang et al. 2025 – – – 93 -0.140(3) – – –
Almeida et al. 2025 0.68 0.92 – 223 – 82 – –
Alfonso et al. 2024 0.68 0.54 – 215 0.202 – – –
Hunt & Reffert 2024 0.66 0.76 1.10 93 – 202(1) – –
Cavallo et al. 2024 0.71 1.05 – 138 0.260 – – –
Hunt & Reffert 2023 0.66 0.77 1.10 93 – – – –
Almeida et al. 2023 0.67 0.92 – 173 0.143 124(1) 0.43 –
Just et al. 2023 – – – 155 – 14 – –
He et al. 2022 – 1.10 – 79 – – – –
Tarricq et al. 2022 0.67 – – 295 – – – –
Jaehnig et al. 2021 0.69(1) – – – – – – –
Rain et al. 2021 0.68 0.79 – 178 – – – 0
Richer et al. 2021 – 0.95 – 288 – – – –
Dias et al. 2021 0.68 0.92 – 223 0.202 – – –
Cantat-Gaudin et al. 2020 0.68 0.54 – 288 – – – –
Kounkel et al. 2020 0.68 1.02 – 170 – – – –
Cantat-Gaudin & Anders 2020 0.68 – – – – – – –
Bossini et al. 2019 0.71 0.82 – 179 0.000 – – –
Soubiran et al. 2018 0.68 – – – – – – –
Cantat-Gaudin et al. 2018 0.68 – – – – – – –
Dib et al. 2018 0.85 – – 155 – – – –
Loktin & Popova 2017 0.66 0.86 – 127 – – – –
Joshi et al. 2016 0.85 1.89 – 155 – 62 – –
Kharchenko et al. 2016 0.85 1.89 – 155 – – – –
Kharchenko et al. 2013 0.85 1.89 – 155 – – – –
Gozha et al. 2012 0.66 – – 130 – 62 – –
Kharchenko et al. 2012 0.85 1.89 – 155 – – – –
Piskunov et al. 2008 0.66 0.85 – 155 – – – –
Ahumada & Lapasset 2007 – 0.85 – 129 – – – 0
van den Bergh 2006 0.66 0.85 – 129 – – – –
Kharchenko et al. 2005 0.66 0.85 – 155 – – – –
Kharchenko et al. 2003 0.66 0.85 – – – – – –
Dias et al. 2002 0.66 0.86 – 130 – – – –
Lynga 1987 0.63 0.88 – 141 – – – –

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

Visualization
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NGC 225 UCC
NGC 225 HUNT23
NGC 225 CANTAT20
Galactocentric position diagram