SAI 4

(MWSC 37)

0.89 UTI

0.7

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 90

Radius (P>50% members) 3.6 [arcmin]

C_N 0.7 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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SAI 4 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate^* distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is very well-studied in the literature.

(*): The parallax distance estimate (~3.26 kpc) differs significantly from the median photometric distance (~2.50 kpc).

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for SAI 4 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	–	5.883	62.711	0.307	-3.091	-0.599	-47.351
Almeida et al.	2025	5.892	62.711	–	–	–	–
Hunt & Reffert	2024	5.905	62.708	0.308	-3.098	-0.624	-47.443
Cavallo et al.	2024	5.946	62.743	0.308	–	–	–
Hunt & Reffert	2023	5.905	62.708	0.308	-3.098	-0.624	-47.443
Almeida et al.	2023	5.902	62.708	–	–	–	–
Just et al.	2023	5.898	62.706	–	–	–	–
Dias et al.	2021	5.892	62.711	0.318	-3.099	-0.516	–
Cantat-Gaudin et al.	2020	5.895	62.712	0.314	-3.095	-0.551	–
Sánchez et al.	2020	5.917	62.704	–	-2.492	-0.608	–
Cantat-Gaudin & Anders	2020	5.895	62.712	0.314	-3.095	-0.551	–
Soubiran et al.	2018	5.895	62.712	–	–	–	-69.27
Bica et al.	2019	5.908	62.7	–	–	–	–
Cantat-Gaudin et al.	2018	5.895	62.712	0.314	-3.095	-0.551	–
Loktin & Popova	2017	5.91	62.704	–	-5.288	-4.478	-100.7
Kharchenko et al.	2016	5.898	62.706	–	–	–	–
Dias et al.	2014	5.917	62.704	–	-1.8	3.0	–
Kharchenko et al.	2013	5.907	62.71	–	-4.53	-3.83	-100.7
Kharchenko et al.	2012	5.907	62.71	–	-4.53	-3.83	-100.7
Glushkova et al.	2010	5.917	62.704	–	–	–	–
Dias et al.	2002	5.917	62.704	–	-1.8	3.0	-100.7

💡 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]	Bfr	BSS
Almeida et al.	2025	2.50	1.77	–	43	–	313	–	–
Hunt & Reffert	2024	–	–	–	–	–	479*	–	–
Cavallo et al.	2024	2.58	1.73	–	200	-0.120	–	–	–
Hunt & Reffert	2023	2.85	1.63	1.68	150	–	–	–	–
Almeida et al.	2023	2.55	1.83	–	34	-0.115	368*	0.65	–
Just et al.	2023	–	–	–	631	–	5	–	–
Dias et al.	2021	2.50	1.77	–	43	-0.071	–	–	–
Cantat-Gaudin et al.	2020	3.22	1.52	–	105	–	–	–	–
Cantat-Gaudin & Anders	2020	2.91	–	–	–	–	–	–	–
Soubiran et al.	2018	2.91	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.91	–	–	–	–	–	–	–
Loktin & Popova	2017	2.01	0.94	–	617	–	–	–	–
Kharchenko et al.	2016	1.60	1.24	–	631	–	–	–	–
Kharchenko et al.	2013	1.60	1.24	–	631	–	–	–	–
Kharchenko et al.	2012	1.60	1.24	–	631	–	–	–	–
Glushkova et al.	2010	1.60	0.84	–	501	–	–	–	–
Dias et al.	2002	1.60	0.84	–	501	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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