Blanco 1

(MWSC 7; zeta Scl; OCL 43; ESO 409 09)

1.0 UTI

1.0

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 739

Stellar density (N₅₀/rad) 6.4 [N/pc²]

C3 classification AA

C_N 1.0 Very rich
C_dens 1.0 Very dense
C_C3 1.0 Very high 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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Blanco 1 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is very well-studied in the literature.

Note: This object shares a significant percentage of members with 2 later reported entries. See table with shared members information.

Very close Low extinction Massive Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Blanco 1 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–	1.222	-29.948	4.226	18.75	2.597	5.193
Li et al.	2025	0.853	-29.958	4.21	18.739	2.602	–
Alfonso et al.	2024	1.356	-29.922	4.189	18.721	2.605	–
Hunt & Reffert	2024	0.915	-30.011	4.232	18.725	2.593	4.217
Cavallo et al.	2024	0.861	-29.907	4.228	–	–	–
Hunt & Reffert	2023	0.915	-30.011	4.232	18.725	2.593	4.217
Almeida et al.	2023	31.717	-30.047	–	–	–	–
Just et al.	2023	0.878	-30.003	–	–	–	–
He et al.	2022	0.872	-29.975	4.224	18.738	2.606	–
Tarricq et al.	2022	0.72	-30.116	4.219	18.722	2.567	–
Jaehnig et al.	2021	1.003	-29.939	4.231	18.737	2.602	–
Rain et al.	2021	0.853	-29.958	4.21	18.739	2.602	–
Dias et al.	2021	16.338	-29.941	4.204	18.689	2.724	5.754
Cantat-Gaudin et al.	2020	0.853	-29.958	4.21	18.739	2.602	–
Cantat-Gaudin & Anders	2020	0.853	-29.958	4.21	18.739	2.602	–
Bossini et al.	2019	0.853	-29.958	–	–	–	–
Soubiran et al.	2018	0.853	-29.958	–	–	–	5.76
Bica et al.	2019	1.027	-29.832	–	–	–	–
Cantat-Gaudin et al.	2018	0.853	-29.958	4.21	18.739	2.602	–
Yen et al.	2018	1.056	-29.928	4.11	18.65	2.63	–
Loktin & Popova	2017	1.035	-29.833	–	20.17	3.0	5.5
Kharchenko et al.	2016	0.878	-30.003	–	–	–	–
Dias et al.	2014	1.029	-29.833	–	9.84	-3.82	–
Kharchenko et al.	2013	0.885	-30.0	–	19.71	2.28	5.5
Gozha et al.	2012	1.029	-29.833	–	–	–	–
Piskunov et al.	2008	0.822	-30.143	–	–	–	–
Kharchenko et al.	2007	1.03	-29.83	–	2.9	–	3.58
Piskunov et al.	2007	0.822	-30.143	–	–	–	–
van den Bergh	2006	0.825	-30.133	–	–	–	–
Kharchenko et al.	2005	0.82	-30.14	–	19.86	2.37	3.58
Kharchenko et al.	2003	0.82	-30.14	–	19.86	3.37	–
Chen et al.	2003	1.063	-29.882	–	20.17	3.0	5.0
Dias et al.	2002	1.029	-29.833	–	20.17	3.0	5.53

💡 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–	0.245	0.03	0.4	85	0.020	1725	0.23	0.0
Li et al.	2025	0.25	0.16	–	85	0.055	–	–	–
Alfonso et al.	2024	0.24	0.01	–	79	-0.015	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	465⁽¹⁾	–	–
Cavallo et al.	2024	0.24	0.36	–	83	0.050	–	–	–
Hunt & Reffert	2023	0.24	0.06	0.40	173	–	–	–	–
Almeida et al.	2023	0.23	0.01	–	100	-0.024	338⁽¹⁾	0.23	–
Just et al.	2023	–	–	–	56	–	436	–	–
He et al.	2022	–	0.05	–	63	–	–	–	–
Tarricq et al.	2022	0.24	–	–	107	–	–	–	–
Jaehnig et al.	2021	0.23⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	0.24	0.03	–	93	–	–	–	0
Dias et al.	2021	0.24	0.06	–	103	-0.016	–	–	–
Cantat-Gaudin et al.	2020	0.24	0.01	–	105	–	–	–	–
Cantat-Gaudin & Anders	2020	0.24	–	–	–	–	–	–	–
Bossini et al.	2019	0.24	0.03	–	94	0.000	–	–	–
Soubiran et al.	2018	0.24	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.24	–	–	–	–	–	–	–
Yen et al.	2018	0.25	0.02	–	145	–	–	–	–
Loktin & Popova	2017	0.25	0.03	–	63	–	–	–	–
Kharchenko et al.	2016	0.25	0.04	–	56	–	–	–	–
Kharchenko et al.	2013	0.25	0.04	–	56	-0.188	–	–	–
Gozha et al.	2012	0.27	–	–	63	0.040	3020	–	–
Piskunov et al.	2008	0.27	0.03	–	209	–	4426⁽¹⁾	–	–
Piskunov et al.	2007	0.27	0.03	–	209	–	2985	–	–
van den Bergh	2006	0.27	0.03	–	63	–	–	–	–
Kharchenko et al.	2005	0.27	0.03	–	209	–	–	–	–
Kharchenko et al.	2003	0.26	0.03	–	–	–	–	–	–
Chen et al.	2003	0.27	0.03	–	60	0.230⁽¹⁾	–	–	–
Dias et al.	2002	0.27	0.03	–	63	0.040	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 14677	50.1	1.03	-30.01	4.23	18.75	2.61	5.52	0.0
Dzeta Scul	2.3	0.43	-30.2	4.21	18.72	2.39	6.9	0.12

💡 Note: The % column shows the percentage of members that Blanco 1 shares with each listed object.

Visualization

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