SAI 1

(MWSC 18)

0.18 UTI

0.0

C_N

0.03

C_dens

0.38

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 4.6 [pc], 0.2 [pc^-2]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.38 Low quality
C_lit 0.26 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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SAI 1 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, well below the mid-plane, affected by low extinction. It is catalogued as a low-mass, old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~3.69 kpc) differs significantly from the median photometric distance (~1.91 kpc).

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Low extinction Low mass Old

Data

🔍 Search references for SAI 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–	2.126	51.729	0.271	-2.669	-1.223	–
Just et al.	2023	2.103	51.721	–	–	–	–
Bica et al.	2019	2.09	51.725	–	–	–	–
Dias et al.	2018	–	–	–	-3.99	-2.31	–
Sampedro et al.	2017	2.083	51.721	–	-4.47	-1.26	–
Kharchenko et al.	2016	2.103	51.721	–	–	–	–
Dias et al.	2014	2.083	51.721	–	0.66	-0.84	–
Kharchenko et al.	2013	2.112	51.724	–	-4.2	-1.78	–
Kharchenko et al.	2012	2.112	51.724	–	-4.2	-1.78	–
Glushkova et al.	2010	2.085	51.721	–	–	–	–
Dias et al.	2002	2.083	51.721	–	0.31	-0.88	–

💡 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–	1.91	0.98	–	1862	–	7	–	–
Just et al.	2023	–	–	–	1862	–	7	–	–
Kharchenko et al.	2016	1.91	0.98	–	1862	–	–	–	–
Kharchenko et al.	2013	1.91	0.98	–	1862	–	–	–	–
Kharchenko et al.	2012	1.91	0.98	–	1862	–	–	–	–
Glushkova et al.	2010	2.17	1.07	–	1259	–	–	–	–
Dias et al.	2002	2.17	1.07	–	1259	–	–	–	–

Visualization

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