SAI 81

(MWSC 1362)

0.86 UTI

0.8

C_N

1.0

C_dens

0.75

C_C3

0.86

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 246

Radius (P>50% members) 4.0 [arcmin]

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.86 Well-studied
C_dup 1.0 Unique

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

Overview

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SAI 81 is a rich, 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 massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is well-studied in the literature.

Distant Moderate extinction Massive Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for SAI 81 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	–	118.024	-28.122	0.222	-1.997	2.953	93.794
Almeida et al.	2025	118.028	-28.127	–	–	–	–
Hunt & Reffert	2024	118.036	-28.126	0.224	-2.002	2.957	54.967
Cavallo et al.	2024	118.031	-28.132	0.228	–	–	–
Hunt & Reffert	2023	118.036	-28.126	0.224	-2.002	2.957	54.967
Almeida et al.	2023	118.034	-28.125	–	–	–	–
Just et al.	2023	118.023	-28.115	–	–	–	–
Dias et al.	2021	118.028	-28.127	0.214	-2.001	2.948	53.251
Cantat-Gaudin et al.	2020	118.036	-28.12	0.21	-2.003	2.944	–
Cantat-Gaudin & Anders	2020	118.036	-28.12	0.21	-2.003	2.944	–
Bica et al.	2019	118.023	-28.121	–	–	–	–
Cantat-Gaudin et al.	2018	118.036	-28.12	0.21	-2.003	2.944	–
Kharchenko et al.	2016	118.023	-28.115	–	–	–	–
Dias et al.	2014	118.029	-28.122	–	-2.81	1.47	–
Kharchenko et al.	2013	118.029	-28.117	–	1.45	5.16	–
Glushkova et al.	2010	118.03	-28.122	–	–	–	–
Dias et al.	2002	118.029	-28.122	–	-2.81	1.47	–

💡 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	3.61	1.81	–	232	–	515	–	–
Hunt & Reffert	2024	–	–	–	–	–	1326*	–	–
Cavallo et al.	2024	3.89	1.83	–	224	0.340	–	–	–
Hunt & Reffert	2023	3.78	1.65	1.85	193	–	–	–	–
Almeida et al.	2023	3.53	1.89	–	233	-0.086	849*	0.65	–
Just et al.	2023	–	–	–	135	–	1227	–	–
Dias et al.	2021	3.61	1.81	–	232	-0.066	–	–	–
Cantat-Gaudin et al.	2020	4.66	1.53	–	162	–	–	–	–
Cantat-Gaudin & Anders	2020	4.18	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.18	–	–	–	–	–	–	–
Kharchenko et al.	2016	5.17	2.26	–	135	–	–	–	–
Kharchenko et al.	2013	5.17	2.26	–	135	–	–	–	–
Glushkova et al.	2010	2.77	1.24	–	1585	–	–	–	–
Dias et al.	2002	2.77	1.24	–	1585	–	–	–	–

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

Visualization

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