Czernik 20

(MWSC 508; OCL 427)

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0.85 UTI
0.75
CN
1.0
Cdens
0.5
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 102
Stellar density (N50/rad) 8.9 [N/pc2]
C3 classification BB
  • CN 0.75 Rich
  • Cdens 1.0 Very dense
  • CC3 0.5 Intermediate 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¸
Czernik 20 is a rich, very dense object of intermediate 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, old 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 large percentage of members with 2 later reported entries. See table with shared members information.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg23' along with NGC 1857.

Cavallo et al. (2024)
Gold sample.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Data
🔍 Search references for Czernik 20 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 80.12 39.536 0.275 0.564 -1.591 31.076
Li et al. 2025 80.129 39.545 0.264 0.619 -1.583 –
Hu & Soubiran 2025 80.124 39.544 – – – –
Almeida et al. 2025 80.136 39.542 – – – –
Zhang et al. 2024 80.133 39.544 – – – –
Hunt & Reffert 2024 80.133 39.544 0.286 0.543 -1.59 30.945
Cavallo et al. 2024 80.124 39.544 0.285 – – –
Hunt & Reffert 2023 80.133 39.544 0.286 0.543 -1.59 30.945
Just et al. 2023 80.105 39.54 – – – –
Dias et al. 2021 80.136 39.542 0.268 0.612 -1.576 –
Spina et al. 2021 80.127 39.543 0.267 0.632 -1.576 –
Cantat-Gaudin et al. 2020 80.129 39.545 0.264 0.619 -1.583 –
Donor et al. 2020 80.115 39.54 – 0.58 -1.56 31.4
Zhong et al. 2020 80.129 39.545 – 0.619 -1.583 25.17
Cantat-Gaudin & Anders 2020 80.129 39.545 0.264 0.619 -1.583 –
Bica et al. 2019 80.055 39.573 – – – –
Cantat-Gaudin et al. 2018 80.129 39.545 0.264 0.619 -1.583 –
Loktin & Popova 2017 80.13 39.547 – -0.67 -3.3 -29.97
Kharchenko et al. 2016 80.105 39.54 – – – –
Dias et al. 2014 80.133 39.547 – -0.67 -3.3 -29.97
Kharchenko et al. 2013 80.115 39.54 – -3.76 -1.12 –
Kharchenko et al. 2012 80.115 39.54 – -3.76 -1.12 –
Bukowiecki et al. 2011 80.133 39.546 – – – –
van den Bergh 2006 80.025 39.467 – – – –
Dias et al. 2002 80.133 39.547 – -0.67 -3.3 -29.97
Dambis 1999 80.025 39.467 – – – –

💡 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– 3.375 1.65 0.58 1549 -0.190 332 – –
Li et al. 2025 2.48 1.55 – 325 -0.148 – – –
Hu & Soubiran 2025 – – – – -0.220(5) – – –
Almeida et al. 2025 3.42 1.86 – 1479 – 434 – –
Zhang et al. 2024 – – – – -0.224(1) – – –
Hunt & Reffert 2024 – – – – – 426(1) – –
Cavallo et al. 2024 3.60 2.10 – 1259 -0.510 – – –
Hunt & Reffert 2023 3.38 1.47 0.58 1901 – – – –
Just et al. 2023 – – – 1549 – 238 – –
Dias et al. 2021 3.42 1.86 – 1479 -0.113 – – –
Spina et al. 2021 3.67 – – 1660 -0.146(20) – – –
Cantat-Gaudin et al. 2020 3.48 1.49 – 1660 – – – –
Donor et al. 2020 – – – – -0.160 – – –
Zhong et al. 2020 2.00 1.86 – 9190 -0.257 – – –
Cantat-Gaudin & Anders 2020 3.42 – – – – – – –
Cantat-Gaudin et al. 2018 3.42 – – – – – – –
Loktin & Popova 2017 2.96 1.30 – 14 – – – –
Kharchenko et al. 2016 2.00 1.86 – 1549 – – – –
Kharchenko et al. 2013 2.00 1.86 – 1549 – – – –
Bukowiecki et al. 2012 – – – – – 96 – –
Kharchenko et al. 2012 2.00 1.86 – 1549 – – – –
Bukowiecki et al. 2011 2.70(1) 1.33 – 1778 – – – –
van den Bergh 2006 3.37 1.30 – 15 – – – –
Dias et al. 2002 3.37 1.31 – 15 – – – –
Dambis 1999 3.56 1.65 – 10 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
Teutsch 88 91.2 80.12 39.54 0.29 0.53 -1.58 31.26 0.08
Melotte 32 6.9 80.03 39.33 0.34 0.48 -1.37 -0.3 0.94

💡 Note: The % column shows the percentage of members that Czernik 20 shares with each listed object.

Visualization
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Czernik 20 UCC
Czernik 20 HUNT23
Czernik 20 CANTAT20
Galactocentric position diagram