PTB 2

(MWSC 3623)

0.13 UTI

0.0

C_N

0.02

C_dens

0.12

C_C3

0.25

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 14

Radius (P>50% members) 8.3 [arcmin]

C_N 0.0 Sparse
C_dens 0.02 Very loose
C_C3 0.12 Very 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

ℹ️

PTB 2 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a large^* distance, well above the mid-plane, affected by moderate extinction. It is catalogued as a massive, old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~5.04 kpc) differs significantly from the median photometric distance (~3.09 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 Moderate extinction Massive Old

Data

🔍 Search references for PTB 2 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	336.302	71.491	0.199	-2.501	-0.509	-74.094
Just et al.	2023	336.295	71.536	–	–	–	–
Kharchenko et al.	2016	336.295	71.536	–	–	–	–
Kharchenko et al.	2013	336.3	71.54	–	1.04	-2.75	–
Kharchenko et al.	2012	336.3	71.54	–	1.04	-2.75	–

💡 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	–	–	–	1995	–	3221	–	–
Kharchenko et al.	2016	3.09	2.39	–	1995	–	–	–	–
Kharchenko et al.	2013	3.09	2.39	–	1995	–	–	–	–
Kharchenko et al.	2012	3.09	2.39	–	1995	–	–	–	–

Visualization

ℹ️