Pismis 21

(MWSC 2283)

0.77 UTI

0.76

C_N

1.0

C_dens

1.0

C_C3

0.55

C_lit

1.0

C_dup

N_m (P>50%) 126

Core radius and density 0.9 [pc], 17 [pc^-2]

C3 classification AA

C_N 0.76 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.55 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Pismis 21 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 massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is moderately studied in the literature.

Relatively close Moderate extinction Massive Near-solar metallicity Intermediate age

Palma et al. (2025)
Part of multiple system G234, along with Theia_3114 and Pismis_20.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Data

🔍 Search references for Pismis 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–	229.198	-59.66	0.303	-4.189	-3.777	-21.439
Hunt & Reffert	2024	229.194	-59.66	0.31	-4.199	-3.766	-10.16
Cavallo et al.	2024	229.194	-59.659	0.31	–	–	–
Hunt & Reffert	2023	229.194	-59.66	0.31	-4.199	-3.766	-10.16
Just et al.	2023	229.173	-59.653	–	–	–	–
Richer et al.	2021	229.187	-59.658	0.307	-4.152	-3.743	–
Cantat-Gaudin et al.	2020	229.199	-59.659	0.29	-4.143	-3.761	–
Sánchez et al.	2020	229.204	-59.667	–	-4.186	-3.673	–
Cantat-Gaudin & Anders	2020	229.199	-59.659	0.29	-4.143	-3.761	–
Cantat-Gaudin et al.	2018	229.199	-59.659	0.29	-4.143	-3.761	–
Dias et al.	2018	–	–	–	-4.02	-4.02	–
Dib et al.	2018	229.185	-59.655	–	–	–	–
Sampedro et al.	2017	229.204	-59.667	–	-4.7	-4.66	–
Joshi et al.	2016	229.185	-59.655	–	–	–	–
Kharchenko et al.	2016	229.173	-59.653	–	–	–	–
Dias et al.	2014	229.204	-59.667	–	-4.58	-4.45	–
Kharchenko et al.	2013	229.185	-59.655	–	-5.53	-1.94	-41.2
Lynga	1987	229.193	-59.651	–	–	–	–
van den Bergh & Hagen	1975	228.2	-59.467	–	–	–	–

💡 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]	B_frac	BSS
UCC	99999–	2.895	2.835	2.81	129	0.000	1186	–	–
Hunt & Reffert	2024	2.96	4.23	2.81	9	–	2335⁽¹⁾	–	–
Cavallo et al.	2024	3.84	4.25	–	9	0.000	–	–	–
Hunt & Reffert	2023	2.96	4.23	2.81	9	–	–	–	–
Just et al.	2023	–	–	–	129	–	37	–	–
Richer et al.	2021	–	1.93	–	–	–	–	–	–
Kounkel et al.	2020	2.83	3.70	–	115	–	–	–	–
Cantat-Gaudin & Anders	2020	3.14	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.14	–	–	–	–	–	–	–
Dib et al.	2018	1.17	–	–	129	–	–	–	–
Joshi et al.	2016	1.17	1.97	–	129	–	–	–	–
Kharchenko et al.	2016	1.17	1.97	–	129	–	–	–	–
Kharchenko et al.	2013	1.17	1.97	–	129	–	–	–	–

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

Visualization

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