BDSB 21

(BDS2003 21; MWSC 3464)

0.12 UTI

0.0

C_N

0.04

C_dens

0.25

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 20

Core radius and density 2.3 [pc], 0.2 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.04 Very loose
C_C3 0.25 Low quality
C_lit 0.16 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 21 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, above the mid-plane, affected by high extinction. It is catalogued as a low-mass, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~4.39 kpc) differs significantly from the median photometric distance (~1.28 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 High extinction Low mass Intermediate age

Bica et al. (2003)
Classified as stellar group (IRGr).

Data

🔍 Search references for BDSB 21 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–	316.34	49.681	0.228	-3.193	-3.997	-68.628
Just et al.	2023	316.335	49.654	–	–	–	–
Dib et al.	2018	316.339	49.657	–	–	–	–
Joshi et al.	2016	316.339	49.657	–	–	–	–
Kharchenko et al.	2016	316.335	49.654	–	–	–	–
Kharchenko et al.	2013	316.339	49.657	–	-1.86	-1.33	–
Kharchenko et al.	2012	316.339	49.657	–	-1.86	-1.33	–
Bica et al.	2003	316.314	49.664	–	–	–	–

💡 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–	1.28	3.48	–	794	–	23	–	–
Just et al.	2023	–	–	–	794	–	23	–	–
Dib et al.	2018	1.28	–	–	794	–	–	–	–
Joshi et al.	2016	1.28	3.48	–	794	–	–	–	–
Kharchenko et al.	2016	1.28	3.48	–	794	–	–	–	–
Kharchenko et al.	2013	1.28	3.48	–	794	–	–	–	–
Kharchenko et al.	2012	1.28	3.48	–	794	–	–	–	–

Visualization

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