BDSB 81

(MWSC 825)

0.08 UTI

0.0

C_N

0.16

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 19

Stellar density (N₅₀/rad) 0.8 [N/pc²]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.16 Very loose
C_C3 0.25 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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BDSB 81 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, near the mid-plane, affected by moderate extinction. It is catalogued as a low-mass, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~3.64 kpc) differs significantly from the median photometric distance (~2.67 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 Moderate extinction Low mass Intermediate age

Data

🔍 Search references for BDSB 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	99999–	93.972	14.267	0.275	-0.197	-0.439	64.903
Just et al.	2023	93.94	14.278	–	–	–	–
Kharchenko et al.	2016	93.94	14.278	–	–	–	–
Kharchenko et al.	2013	93.948	14.277	–	-0.96	1.39	–

💡 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–	2.67	2.58	–	130	–	33	–	–
Just et al.	2023	–	–	–	130	–	33	–	–
Kharchenko et al.	2016	2.67	2.58	–	130	–	–	–	–
Kharchenko et al.	2013	2.67	2.58	–	130	–	–	–	–

Visualization

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