SAI 25

(MWSC 250)

0.48 UTI

0.0

C_N

0.14

C_dens

0.25

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 16

Stellar density (N₅₀/rad) 0.7 [N/pc²]

C3 classification DB

C_N 0.0 Sparse
C_dens 0.14 Very loose
C_C3 0.25 Low 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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SAI 25 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

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

Relatively close High extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for SAI 25 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–	44.979	57.414	0.389	0.62	-1.278	-33.843
Almeida et al.	2025	45.108	57.335	–	–	–	–
Hunt & Reffert	2024	45.071	57.479	0.41	0.649	-1.265	-13.889
Celli et al.	2024	45.109	57.307	–	–	–	–
Cavallo et al.	2024	44.99	57.67	0.41	–	–	–
Hunt & Reffert	2023	45.071	57.479	0.41	0.649	-1.265	-13.889
Almeida et al.	2023	45.103	57.339	–	–	–	–
Just et al.	2023	45.086	57.283	–	–	–	–
Dias et al.	2021	45.108	57.335	0.322	0.441	-1.075	–
Cantat-Gaudin et al.	2020	45.109	57.307	0.372	0.608	-1.205	–
Cantat-Gaudin & Anders	2020	45.109	57.307	0.372	0.608	-1.205	–
Soubiran et al.	2018	45.109	57.307	–	–	–	-66.26
Bica et al.	2019	45.116	57.268	–	–	–	–
Cantat-Gaudin et al.	2018	45.109	57.307	0.372	0.608	-1.205	–
Loktin & Popova	2017	45.105	57.267	–	2.117	-0.598	–
Kharchenko et al.	2016	45.086	57.283	–	–	–	–
Dias et al.	2014	45.112	57.267	–	-2.19	2.82	–
Kharchenko et al.	2013	45.097	57.285	–	2.04	1.94	–
Kharchenko et al.	2012	45.097	57.285	–	2.04	1.94	–
Glushkova et al.	2010	45.111	57.267	–	–	–	–
Dias et al.	2002	45.112	57.267	–	-2.19	2.82	–

💡 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–	2.3	3.27	2.7	481	0.270	490	0.69	–
Almeida et al.	2025	1.50	3.31	–	286	–	245	–	–
Hunt & Reffert	2024	–	–	–	–	–	1396⁽¹⁾	–	–
Celli et al.	2024	–	–	–	2	–	490	–	–
Cavallo et al.	2024	2.83	3.23	–	40	0.950	–	–	–
Hunt & Reffert	2023	2.26	3.39	2.70	19	–	–	–	–
Almeida et al.	2023	2.12	3.35	–	11	-0.086	959⁽¹⁾	0.69	–
Just et al.	2023	–	–	–	1531	–	205	–	–
Dias et al.	2021	1.50	3.31	–	286	0.270	–	–	–
Cantat-Gaudin et al.	2020	2.65	4.24	–	2	–	–	–	–
Cantat-Gaudin & Anders	2020	2.49	–	–	–	–	–	–	–
Soubiran et al.	2018	2.49	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.49	–	–	–	–	–	–	–
Loktin & Popova	2017	1.12	3.89	–	676	–	–	–	–
Kharchenko et al.	2016	2.30	3.01	–	1531	–	–	–	–
Kharchenko et al.	2013	2.30	3.01	–	1531	–	–	–	–
Kharchenko et al.	2012	2.30	3.01	–	1531	–	–	–	–
Glushkova et al.	2010	2.29	2.60	–	1413	–	–	–	–
Dias et al.	2002	2.29	2.60	–	1413	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0259	36.0	45.08	57.47	0.42	0.69	-1.31	-93.05	0.2
OC 0258	4.0	44.72	57.69	0.42	0.6	-1.26	17.28	0.13

💡 Note: The % column shows the percentage of members that SAI 25 shares with each listed object.

Visualization

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