NGC 1901

(MWSC 500)

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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%) 116
Radius (P>50% members) 37.4 [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
ℹī¸
NGC 1901 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very 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 age and metallicity parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a significant percentage of members with a later reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for NGC 1901 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 79.534 -68.305 2.387 1.697 12.701 0.978
Li et al. 2025 79.561 -68.294 2.358 1.537 12.67 –
Hu & Soubiran 2025 79.579 -68.081 – – – –
Almeida et al. 2025 79.708 -68.299 – – – –
Alfonso et al. 2024 79.758 -68.138 2.356 1.681 12.708 –
Hunt & Reffert 2024 79.288 -68.441 2.367 1.703 12.701 0.327
Cavallo et al. 2024 79.579 -68.081 2.376 – – –
Hunt & Reffert 2023 79.288 -68.441 2.367 1.703 12.701 0.327
Almeida et al. 2023 79.595 -68.409 – – – –
Just et al. 2023 79.561 -68.439 – – – –
He et al. 2022 79.65 -68.229 2.391 1.718 12.716 –
Tarricq et al. 2022 79.391 -68.33 2.408 1.703 12.709 –
Jaehnig et al. 2021 79.293 -68.382 2.392 1.697 12.651 –
Rain et al. 2021 79.561 -68.294 2.358 1.537 12.67 –
Dias et al. 2021 79.708 -68.299 2.356 1.571 12.674 1.259
Cantat-Gaudin et al. 2020 79.561 -68.294 2.358 1.537 12.67 –
Cantat-Gaudin & Anders 2020 79.561 -68.294 2.358 1.537 12.67 –
Bossini et al. 2019 79.561 -68.294 – – – –
Soubiran et al. 2018 79.561 -68.294 – – – 0.85
Cantat-Gaudin et al. 2018 79.561 -68.294 2.358 1.537 12.67 –
Angelo et al. 2019 79.558 -68.444 – – – –
Loktin & Popova 2017 79.545 -68.45 – 1.128 1.752 -2.1
Kharchenko et al. 2016 79.561 -68.439 – – – –
Dias et al. 2014 79.546 -68.45 – 0.01 1.01 –
Kharchenko et al. 2013 79.56 -68.44 – 1.68 9.54 -2.1
Gozha et al. 2012 79.546 -68.45 – – – –
Piskunov et al. 2008 79.567 -68.443 – – – –
Kharchenko et al. 2007 79.56 -68.44 – 0.5 – -9.63
Piskunov et al. 2007 79.567 -68.443 – – – –
van den Bergh 2006 79.546 -68.45 – – – –
Kharchenko et al. 2005 79.56 -68.44 – 1.16 9.8 -9.63
Kharchenko et al. 2003 79.5 -68.46 – 2.61 8.91 –
Dias et al. 2002 79.546 -68.45 – -0.03 0.9 0.5

💡 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 0.41 0.19 – 961 -0.163 – – –
Hu & Soubiran 2025 – – – – -0.290* – – –
Almeida et al. 2025 0.42 0.11 – 861 – 91 – –
Alfonso et al. 2024 0.43 0.21 – 764 -0.042 – – –
Hunt & Reffert 2024 – – – – – 194* – –
Cavallo et al. 2024 0.43 0.31 – 537 0.260 – – –
Hunt & Reffert 2023 0.40 0.12 0.40 282 – – – –
Almeida et al. 2023 0.42 0.21 – 771 0.030 197* 0.35 –
Just et al. 2023 – – – 708 – 55 – –
He et al. 2022 – 0.25 – 891 – – – –
Tarricq et al. 2022 0.42 – – 891 – – – –
Jaehnig et al. 2021 0.42* – – – – – – –
Rain et al. 2021 0.42 0.09 – 603 – – – 0
Dias et al. 2021 0.42 0.11 – 861 -0.042 – – –
Cantat-Gaudin et al. 2020 0.43 0.21 – 891 – – – –
Cantat-Gaudin & Anders 2020 0.42 – – – – – – –
Bossini et al. 2019 0.41 0.15 – 828 -0.080 – – –
Soubiran et al. 2018 0.42 – – – – – – –
Cantat-Gaudin et al. 2018 0.42 – – – – – – –
Angelo et al. 2019 0.42 – – 500 – 22 – –
Loktin & Popova 2017 0.44 0.15 – 450 – – – –
Kharchenko et al. 2016 0.41 0.07 – 708 – – – –
Kharchenko et al. 2013 0.41 0.07 – 708 -0.331 – – –
Gozha et al. 2012 0.46 – – 603 – 126 – –
Piskunov et al. 2008 0.41 0.06 – 851 – 160* – –
Piskunov et al. 2007 0.41 0.06 – 851 – 88 – –
van den Bergh 2006 0.41 0.19 – 832 – – – –
Kharchenko et al. 2005 0.41 0.06 – 851 – – – –
Kharchenko et al. 2003 0.44 0.19 – – – – – –
Dias et al. 2002 0.46 0.09 – 603 -0.018 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14525 52.6 79.33 -68.29 2.4 1.75 12.7 1.1 0.0

💡 Note: The % column shows the percentage of members that NGC 1901 shares with each listed object.

Visualization
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NGC 1901 UCC
NGC 1901 HUNT23
NGC 1901 CANTAT20
Galactocentric position diagram