Czernik 20

(MWSC 508; OCL 427)

0.72 UTI

0.75

C_N

0.61

C_dens

0.5

C_C3

1.0

C_lit

0.93

C_dup

N_m (P>50%) 102

Core radius and density 1.8 [pc], 3.0 [pc^-2]

C3 classification BB

C_N 0.75 Rich
C_dens 0.61 Moderately dense
C_C3 0.5 Intermediate quality
C_lit 1.0 Very well-studied
C_dup 0.93 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Czernik 20 is a rich, moderately 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 is very likely a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.

Distant Moderate extinction Near-solar metallicity Old

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 classes: 0.97 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.97 (50th percentile), true positive (human-assigned).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0819, e_all=0.1612.

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

Data

🔍 Search references for Czernik 20 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–	80.12	39.536	0.275	0.564	-1.591	31.076
Otto et al.	2026	80.133	39.544	–	0.62	-1.58	31.3
Li et al.	2025	80.129	39.545	0.264	0.619	-1.583	–
Guerco et al.	2025	80.0	39.4	0.27	0.44	-1.6	30.8
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	–	–	–	–
Jadhav & Subramaniam	2021	80.129	39.545	–	–	–	–
Netopil et al.	2022	80.129	39.544	–	–	–	28.04
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
Sampedro et al.	2017	80.133	39.547	–	-0.37	-2.68	–
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	–	–	–	–
Lynga	1987	80.012	39.464	–	–	–	–

💡 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]	B_frac	BSS
UCC	99999–	3.42	1.615	0.58	1549	-0.160	426	–	0
Otto et al.	2026	–	–	–	1660	-0.160⁽¹⁵⁾	–	–	–
Li et al.	2025	2.48	1.55	–	325	-0.148	–	–	–
Guerco et al.	2025	–	–	–	1660	-0.180	–	–	–
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	3.38	1.47	0.58	1903	–	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	–	–
Spina et al.	2022	–	–	–	–	-0.160	–	–	–
Jadhav & Subramaniam	2021	3.48	1.49	–	1660	–	517	–	0⁽¹⁾
Netopil et al.	2022	3.49⁽¹⁾	–	–	1660	-0.160⁽¹⁾	–	–	–
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	–	–	–	–
Kounkel et al.	2020	3.65	2.01	–	759	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.160	–	–	–
Zhong et al.	2020	3.42⁽¹⁾	1.89	–	9190	-0.257	–	–	–
Cantat-Gaudin & Anders	2020	3.42	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.42	–	–	–	–	–	–	–
Loktin & Popova	2017	2.96	1.32	–	14	–	–	–	–
Kharchenko et al.	2016	2.00	1.89	–	1549	–	–	–	–
Kharchenko et al.	2013	2.00	1.89	–	1549	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	96	–	–
Kharchenko et al.	2012	2.00	1.89	–	1549	–	–	–	–
Bukowiecki et al.	2011	2.28⁽¹⁾	1.36	–	1778	–	–	–	–
van den Bergh	2006	3.37	1.32	–	15	–	–	–	–
Dias et al.	2002	3.37	1.33	–	15	–	–	–	–
Dambis	1999	3.56	1.68	–	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	0.07
NGC 1857	6.9	80.03	39.33	0.34	0.48	-1.37	-0.3	0.9

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

Visualization

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