PTB 7

(MWSC 26)

0.23 UTI

0.29

C_N

0.09

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

C3 classification CC

Number of members (P>50%) 29

Radius (P>50% members) 6.6 [arcmin]

C_N 0.29 Poorly populated
C_dens 0.09 Very loose
C_C3 0.25 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 7 is a poorly populated, 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 very young cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~4.24 kpc) differs significantly from the median photometric distance (~3.23 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.

Distant High extinction Very young

Data

🔍 Search references for PTB 7 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	–	3.748	68.331	0.236	-2.593	-0.065	-52.596
Just et al.	2023	3.792	68.314	–	–	–	–
Kharchenko et al.	2016	3.792	68.314	–	–	–	–
Kharchenko et al.	2013	3.801	68.318	–	-0.22	-1.11	–
Kharchenko et al.	2012	3.801	68.318	–	-0.3	-1.37	–

💡 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	–	–	–	4	–	577	–	–
Kharchenko et al.	2016	3.23	4.36	–	4	–	–	–	–
Kharchenko et al.	2013	3.23	4.36	–	4	–	–	–	–
Kharchenko et al.	2012	3.92	3.23	–	1413	–	–	–	–

Visualization

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