Czernik 30

(MWSC 1253; OCL 574)

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0.91 UTI
0.77
CN
0.91
Cdens
1.0
CC3
0.94
Clit
1.0
Cdup
Nm (P>50%) 162
Core radius and density 1.6 [pc], 4.5 [pc-2]
C3 classification AA
  • CN 0.77 Rich
  • Cdens 0.91 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.94 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Czernik 30 is a rich, very dense object of very high C3 quality. Its parallax locates it at a large distance, well above the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, old 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.

Note: This object contains blue stragglers according to at least one source.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Perren et al. (2022)
The CMD shows a robust main sequence and a well-defined giant branch, with the TO at approximately G=17.5. ASteCA gives a distance of 6.5 kpc and an age of 3.6 Gyr, in good agreement with Dias 2021 (5.9 kpc, 3 Gyr). Hayes 2015 found 9.12 kpc and 2.8 Gyr, and seven prior studies all give distances in the range 7.9–9.3 kpc, all of which appear to overestimate the distance. CG20, WEBDA, and MWSC are consistent with ASteCA at 6.2–6.8 kpc. The OC02 value of 9.1 kpc is rejected. A footnote notes that the distance modulus quoted in Table 7 of Hayes et al. is incorrect.

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0504, e_all=0.1815.

Data
πŸ” Search references for Czernik 30 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 112.795 -9.946 0.128 -0.613 -0.072 81.361
Otto et al. 2026 112.795 -9.946 – -0.59 -0.1 81.5
Hu & Soubiran 2025 112.797 -9.947 – – – –
Almeida et al. 2025 112.799 -9.948 – – – –
Hunt & Reffert 2024 112.795 -9.946 0.133 -0.612 -0.066 81.737
Cavallo et al. 2024 112.797 -9.947 0.128 – – –
Hunt & Reffert 2023 112.795 -9.946 0.133 -0.612 -0.066 81.737
Just et al. 2023 112.79 -9.938 – – – –
Perren et al. 2022 112.796 -9.945 – – – –
Jadhav & Subramaniam 2021 112.796 -9.945 – – – –
Netopil et al. 2022 112.796 -9.945 – – – 82.07
Dias et al. 2021 112.799 -9.948 0.113 -0.592 -0.106 –
Spina et al. 2021 112.795 -9.945 0.1 -0.638 -0.125 –
Cantat-Gaudin et al. 2020 112.796 -9.945 0.11 -0.587 -0.097 –
SΓ‘nchez et al. 2020 112.825 -9.967 – -0.514 -0.308 –
Donor et al. 2020 112.797 -9.94 – -0.69 -0.1 81.3
Cantat-Gaudin & Anders 2020 112.796 -9.945 0.11 -0.587 -0.097 –
Bica et al. 2019 112.786 -9.944 – – – –
Cantat-Gaudin et al. 2018 112.796 -9.945 0.11 -0.587 -0.097 –
Dias et al. 2018 – – – -1.85 0.56 –
Loktin & Popova 2017 112.785 -9.94 – -1.874 1.12 79.9
Sampedro et al. 2017 112.825 -9.967 – -3.57 -2.72 –
Kharchenko et al. 2016 112.79 -9.938 – – – –
Tadross 2014 112.825 -9.967 – – – –
Kharchenko et al. 2013 112.797 -9.94 – -1.89 0.94 –
Gozha et al. 2012 112.825 -9.967 – – – –
Bukowiecki et al. 2011 112.792 -9.939 – – – –
Dias et al. 2002 112.825 -9.967 – -1.43 -1.94 79.9
Lynga 1987 112.818 -9.961 – – – –

πŸ’‘ 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– 6.55 0.835 1.51 2512 -0.380 2939 0.79 5
Otto et al. 2026 – – – 2884 -0.380(15) – – –
Hu & Soubiran 2025 – – – – -0.330(5) – – –
Almeida et al. 2025 5.94 0.96 – 2985 – 2172 – –
Hunt & Reffert 2024 6.24 0.91 1.51 1081 – 1037(1) – –
Cavallo et al. 2024 5.04 1.23 – 4169 -0.740 – – –
Hunt & Reffert 2023 6.23 0.91 1.51 1081 – – – –
Just et al. 2023 – – – 1585 – 3133 – –
Perren et al. 2022 6.55 0.91 – 3631 -0.320 7200 0.79 –
Spina et al. 2022 – – – – -0.400 – – –
Jadhav & Subramaniam 2021 6.64 0.62 – 2884 – 2939 – 5(1)
Netopil et al. 2022 7.24(1) – – 2512 -0.400(1) – – –
Dias et al. 2021 5.94 0.96 – 2985 -0.282 – – –
Spina et al. 2021 5.47 – – 2884 -0.396(20) – – –
Cantat-Gaudin et al. 2020 6.64 0.62 – 2884 – – – –
Kounkel et al. 2020 4.96 1.13 – 1122 – – – –
Donor et al. 2020 – – – – -0.400 – – –
Cantat-Gaudin & Anders 2020 7.19 – – – – – – –
Cantat-Gaudin et al. 2018 7.19 – – – – – – –
Loktin & Popova 2017 2.45 0.09 – 490 – – – –
Kharchenko et al. 2016 6.81 0.33 – 1585 – – – –
Perren et al. 2015 8.00(1) 0.32(1) – 3162(1) 0.070(1) – – –
Tadross 2014 2.27 1.10 – 130 – – – –
Kharchenko et al. 2013 6.81 0.33 – 1585 -0.380 – – –
Gozha et al. 2012 7.14 – – 2512 -0.380 – – –
Bukowiecki et al. 2011 6.34(1) 0.28 – 2512 – – – –
Dias et al. 2002 9.12 0.76 – 2512 -0.210 – – –

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

Visualization
ℹ️
Czernik 30 UCC
Czernik 30 HUNT23
Czernik 30 CANTAT20
Galactocentric position diagram