Czernik 21

(MWSC 543)

0.92 UTI

1.0

C_N

1.0

C_dens

0.62

C_C3

1.0

C_lit

1.0

C_dup

N_m (P>50%) 571

Core radius and density 2.8 [pc], 6.7 [pc^-2]

C3 classification AC

C_N 1.0 Very rich
C_dens 1.0 Very dense
C_C3 0.62 Intermediate quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Czernik 21 is a very 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 massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

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

Distant Moderate extinction Massive Near-solar metallicity Old Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.26 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.26 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1231, e_all=0.0775.

Data

🔍 Search references for Czernik 21 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–	81.667	36.016	0.255	2.15	-0.913	43.587
Otto et al.	2026	81.676	36.018	–	2.24	-0.91	44.4
Li et al.	2025	81.671	36.013	0.221	2.244	-0.907	–
Guerco et al.	2025	81.7	36.1	0.24	2.18	-1.01	45.5
Hu & Soubiran	2025	81.675	36.006	–	–	–	–
Almeida et al.	2025	81.675	36.011	–	–	–	–
Zhang et al.	2024	81.676	36.018	–	–	–	–
Hunt & Reffert	2024	81.676	36.018	0.272	2.184	-0.891	41.628
Cavallo et al.	2024	81.675	36.006	0.265	–	–	–
Hunt & Reffert	2023	81.676	36.018	0.272	2.184	-0.891	41.628
Just et al.	2023	81.673	36.016	–	–	–	–
Jadhav & Subramaniam	2021	81.671	36.013	–	–	–	–
Netopil et al.	2022	81.671	36.013	–	–	–	45.14
Dias et al.	2021	81.675	36.011	0.225	2.291	-0.915	45.77
Spina et al.	2021	81.676	36.013	0.22	2.274	-0.914	–
Cantat-Gaudin et al.	2020	81.671	36.013	0.221	2.244	-0.907	–
Sánchez et al.	2020	81.671	36.014	–	2.449	-0.915	–
Donor et al.	2020	81.683	36.015	–	2.38	-1.04	45.0
Zhong et al.	2020	81.671	36.013	–	2.244	-0.907	37.915
Cantat-Gaudin & Anders	2020	81.671	36.013	0.221	2.244	-0.907	–
Soubiran et al.	2018	81.671	36.013	–	–	–	45.52
Cantat-Gaudin et al.	2018	81.671	36.013	0.221	2.244	-0.907	–
Dias et al.	2018	–	–	–	3.6	-2.73	–
Loktin & Popova	2017	81.675	36.015	–	0.591	-1.279	–
Sampedro et al.	2017	81.671	36.014	–	-2.77	-4.67	–
Kharchenko et al.	2016	81.673	36.016	–	–	–	–
Dias et al.	2014	81.671	36.014	–	-2.56	-4.73	–
Kharchenko et al.	2013	81.682	36.015	–	1.41	-3.82	–
Kharchenko et al.	2012	81.682	36.015	–	1.41	-3.82	–
Bukowiecki et al.	2011	81.658	36.013	–	–	–	–
Glushkova et al.	2010	81.671	36.014	–	–	–	–
Dias et al.	2002	81.671	36.014	–	-2.56	-4.73	–
Lynga	1987	81.613	36.005	–	–	–	–

💡 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–	4.0	2.68	2.31	2302	-0.320	3504	–	1
Otto et al.	2026	–	–	–	2570	-0.330⁽¹⁵⁾	–	–	–
Li et al.	2025	3.38	2.98	–	2364	-0.306	–	–	–
Guerco et al.	2025	–	–	–	2570	-0.320	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.300⁽⁵⁾	–	–	–
Almeida et al.	2025	4.27	2.87	–	1416	–	2311	–	–
Zhang et al.	2024	–	–	–	–	-0.323⁽¹⁾	–	–	–
Hunt & Reffert	2024	3.24	2.76	2.31	1047	–	2424⁽¹⁾	–	–
Cavallo et al.	2024	3.85	2.58	–	1549	0.020	–	–	–
Hunt & Reffert	2023	3.24	2.76	2.31	1047	–	–	–	–
Just et al.	2023	–	–	–	2239	–	4634	–	–
Spina et al.	2022	–	–	–	–	-0.320	–	–	–
Jadhav & Subramaniam	2021	4.04	2.05	–	2570	–	4585	–	1⁽¹⁾
Netopil et al.	2022	4.04⁽¹⁾	–	–	2570	-0.320⁽¹⁾	–	–	–
Dias et al.	2021	4.27	2.87	–	1416	-0.239	–	–	–
Spina et al.	2021	3.80	–	–	2570	-0.322⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	4.04	2.05	–	2570	–	–	–	–
Kounkel et al.	2020	3.68	2.59	–	1585	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.320	–	–	–
Zhong et al.	2020	4.00⁽¹⁾	2.68	–	9350	-0.476	–	–	–
Cantat-Gaudin & Anders	2020	4.00	–	–	–	–	–	–	–
Soubiran et al.	2018	4.00	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.00	–	–	–	–	–	–	–
Loktin & Popova	2017	4.13	2.39	–	741	–	–	–	–
Kharchenko et al.	2016	4.30	2.68	–	2239	–	–	–	–
Kharchenko et al.	2013	4.30	2.68	–	2239	–	–	–	–
Kharchenko et al.	2012	4.30	2.68	–	2239	–	–	–	–
Bukowiecki et al.	2011	2.47⁽¹⁾	2.24	–	3162	–	–	–	–
Glushkova et al.	2010	2.30	2.27	–	3548	–	–	–	–
Dias et al.	2002	2.30	2.27	–	3548	–	–	–	–

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

Visualization

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