Archinal 1

(MWSC 3021)

0.81 UTI

0.76

C_N

1.0

C_dens

0.75

C_C3

0.78

C_lit

1.0

C_dup

N₅₀ (P>50% members) 126

Stellar density (N₅₀/rad) 33.3 [N/pc²]

C3 classification AB

C_N 0.76 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.78 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Archinal 1 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

Relatively close High extinction Near-solar metallicity Very young

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

Cavallo et al. (2024)
Bronze sample.

Data

🔍 Search references for Archinal 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–	283.713	5.547	0.524	-0.199	-1.734	13.415
Almeida et al.	2025	283.717	5.556	–	–	–	–
Hunt & Reffert	2024	283.709	5.55	0.512	-0.273	-1.862	48.38
Cavallo et al.	2024	283.749	5.577	0.538	–	–	–
Hunt & Reffert	2023	283.709	5.55	0.512	-0.273	-1.862	48.38
Just et al.	2023	283.703	5.538	–	–	–	–
Dias et al.	2021	283.717	5.556	0.548	-0.286	-1.534	–
Cantat-Gaudin et al.	2020	283.709	5.55	0.526	-0.225	-1.578	–
Cantat-Gaudin & Anders	2020	283.709	5.55	0.526	-0.225	-1.578	–
Bica et al.	2019	283.704	5.553	–	–	–	–
Cantat-Gaudin et al.	2018	283.709	5.55	0.526	-0.225	-1.578	–
Kharchenko et al.	2016	283.703	5.538	–	–	–	–
Dias et al.	2014	283.704	5.548	–	2.03	2.4	–
Kharchenko et al.	2013	283.71	5.54	–	-0.29	-3.13	–
Dias et al.	2002	283.704	5.548	–	-0.29	-3.13	–

💡 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–	1.74	4.71	2.64	12	0.459	243	–	–
Almeida et al.	2025	1.74	4.57	–	10	–	243	–	–
Hunt & Reffert	2024	–	–	–	–	–	1876⁽¹⁾	–	–
Cavallo et al.	2024	2.39	5.13	–	7	0.800	–	–	–
Hunt & Reffert	2023	1.71	6.00	2.64	10	–	–	–	–
Just et al.	2023	–	–	–	100	–	14	–	–
Dias et al.	2021	1.74	4.57	–	10	0.118	–	–	–
Cantat-Gaudin & Anders	2020	1.80	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.80	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.45	4.71	–	100	–	–	–	–
Kharchenko et al.	2013	1.45	4.71	–	100	–	–	–	–
Dias et al.	2002	1.41	4.71	–	13	–	–	–	–

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

Visualization

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