PTB 6

(MWSC 3769)

0.25 UTI

0.0

C_N

0.37

C_dens

0.38

C_C3

0.25

C_lit

1.0

C_dup

C3 classification CB

Number of members (P>50%) 21

Radius (P>50% members) 3.9 [arcmin]

C_N 0.0 Sparse
C_dens 0.37 Loose
C_C3 0.38 Low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

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

Overview

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PTB 6 is a sparse, 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 an intermediate-age cluster (see Parameters). It is poorly studied in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

⚠️ 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 Intermediate age

Data

🔍 Search references for PTB 6 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	–	358.148	68.232	0.339	-2.834	0.14	-53.969
Just et al.	2023	358.106	68.189	–	–	–	–
Kharchenko et al.	2016	358.106	68.189	–	–	–	–
Kharchenko et al.	2013	358.114	68.193	–	-3.59	-3.05	–
Kharchenko et al.	2012	358.114	68.193	–	-3.59	-3.05	–

💡 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
Just et al.	2023	–	–	–	855	–	832	–	–
Kharchenko et al.	2016	2.75	3.85	–	855	–	–	–	–
Kharchenko et al.	2013	2.75	3.85	–	855	–	–	–	–
Kharchenko et al.	2012	2.75	3.85	–	855	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 2585	96.0	358.4	68.23	0.34	-2.83	0.18	-53.82	0.31

💡 Note: The % column shows the percentage of members that PTB 6 shares with each listed object.

Visualization

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