NGC 581

(MWSC 124; FoF 2131)

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0.96 UTI
0.79
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 208
Stellar density (N50/rad) 29.5 [N/pc2]
C3 classification AA
  • CN 0.79 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 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
NGC 581 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is very well-studied in the literature.

Note: This object shares a small percentage of members with 5 later reported entries. See table with shared members information.

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 581 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 23.341 60.661 0.362 -1.397 -0.581 -38.143
Li et al. 2025 23.339 60.659 0.373 -1.384 -0.497 –
Almeida et al. 2025 23.331 60.66 – – – –
Hunt & Reffert 2024 23.36 60.656 0.366 -1.394 -0.598 -38.142
Celli et al. 2024 23.339 60.659 – – – –
Cavallo et al. 2024 23.327 60.66 0.366 – – –
Hunt & Reffert 2023 23.36 60.656 0.366 -1.394 -0.598 -38.142
Almeida et al. 2023 23.342 60.661 – – – –
Just et al. 2023 23.305 60.649 – – – –
Jaehnig et al. 2021 23.331 60.658 0.4 -1.389 -0.504 –
Rain et al. 2021 23.339 60.659 0.373 -1.384 -0.497 –
Dias et al. 2021 23.331 60.66 0.374 -1.383 -0.493 –
Cantat-Gaudin et al. 2020 23.339 60.659 0.373 -1.384 -0.497 –
Cantat-Gaudin & Anders 2020 23.339 60.659 0.373 -1.384 -0.497 –
Liu & Pang 2019 23.293 60.638 0.455 -1.367 -0.544 –
Dias et al. 2019 23.346 60.65 0.37 -1.382 -0.504 -45.33
Bossini et al. 2019 23.339 60.659 – – – –
Soubiran et al. 2018 23.339 60.659 – – – -45.33
Cantat-Gaudin et al. 2018 23.339 60.659 0.373 -1.384 -0.497 –
Loktin & Popova 2017 23.34 60.65 – -0.263 -0.467 -41.4
Kharchenko et al. 2016 23.305 60.649 – – – –
Dias et al. 2014 23.346 60.65 – -1.86 -0.46 –
Kharchenko et al. 2013 23.316 60.652 – -1.14 0.37 -41.4
Gozha et al. 2012 23.346 60.65 – – – –
Kharchenko et al. 2012 23.316 60.652 – -1.14 0.37 -41.43
Piskunov et al. 2008 23.339 60.645 – – – –
Kharchenko et al. 2007 23.34 60.65 – 0.12 – -41.43
van den Bergh 2006 23.35 60.65 – – – –
Kharchenko et al. 2005 23.34 60.65 – -0.69 0.2 -40.42
Kharchenko et al. 2003 23.34 60.67 – -0.02 0.03 –
Chen et al. 2003 23.242 60.662 – -1.6 0.66 -37.0
Dias et al. 2002 23.346 60.65 – -1.6 0.66 -44.2
Dambis 1999 23.346 60.65 – – – –

💡 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– 2.29 1.195 0.93 28 -0.049 720 0.7 0.0
Li et al. 2025 2.42 1.35 – 24 0.046 – – –
Almeida et al. 2025 2.29 1.45 – 29 – 831 – –
Hunt & Reffert 2024 – – – – – 1262(1) – –
Celli et al. 2024 – – – 28 – 725 – –
Cavallo et al. 2024 2.74 1.58 – 22 -0.100 – – –
Hunt & Reffert 2023 2.50 1.29 0.93 47 – – – –
Almeida et al. 2023 2.33 1.41 – 66 -0.078 715(1) 0.70 –
Just et al. 2023 – – – 28 – 404 – –
Jaehnig et al. 2021 2.48(1) – – – – – – –
Rain et al. 2021 2.49 1.18 – 21 – – – 0
Dias et al. 2021 2.29 1.45 – 29 -0.020 – – –
Cantat-Gaudin et al. 2020 2.50 1.09 – 28 – – – –
Cantat-Gaudin & Anders 2020 2.49 – – – – – – –
Liu & Pang 2019 – – – 60 0.500 – – –
Dias et al. 2019 2.06 1.05 – 22 -1.623 – – –
Bossini et al. 2019 2.65 1.21 – 26 0.000 – – –
Soubiran et al. 2018 2.49 – – – – – – –
Cantat-Gaudin et al. 2018 2.49 – – – – – – –
Loktin & Popova 2017 2.20 1.17 – 22 – – – –
Kharchenko et al. 2016 2.20 1.03 – 28 – – – –
Kharchenko et al. 2013 2.20 1.03 – 28 – – – –
Gozha et al. 2012 2.19 – – 22 -0.850 178 – –
Kharchenko et al. 2012 2.20 1.03 – 28 – – – –
Piskunov et al. 2008 2.19 1.21 – 28 – – – –
van den Bergh 2006 2.19 1.18 – 22 – – – –
Kharchenko et al. 2005 2.19 1.21 – 28 – – – –
Kharchenko et al. 2003 2.17 1.18 – – – – – –
Chen et al. 2003 2.19 – – 20 – – – –
Dias et al. 2002 2.19 1.18 – 22 – – – –
Dambis 1999 2.61 1.28 – 16 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
Schoenball 1 16.3 23.42 60.75 0.23 -1.29 -0.65 -37.74 0.15
Gulliver 16 11.1 23.42 60.75 0.21 -1.28 -0.65 -37.02 0.46
Teutsch J0135.2+6041 9.1 23.44 60.67 0.36 -1.44 -0.61 -38.14 0.09
UBC 186 7.7 23.47 60.66 0.34 -1.34 -0.51 – 0.11
CWWDL 6155 4.8 23.23 60.63 0.34 -1.26 -0.61 – 0.05

💡 Note: The % column shows the percentage of members that NGC 581 shares with each listed object.

Visualization
ℹī¸
NGC 581 UCC
NGC 581 HUNT23
NGC 581 CANTAT20
Galactocentric position diagram