Bochum 9

(MWSC 1825)

0.25 UTI

0.0

C_N

0.03

C_dens

0.12

C_C3

0.55

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 14

Radius (P>50% members) 6.7 [arcmin]

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.12 Very low quality
C_lit 0.55 Moderately studied
C_dup 1.0 Unique

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

Overview

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Bochum 9 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, below the mid-plane, affected by low extinction. It is catalogued as a low-mass, intermediate-age cluster (see Parameters). It is moderately studied in the literature.

(*): The parallax distance estimate (~4.81 kpc) differs significantly from the median photometric distance (~0.94 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.

Close Low extinction Low mass Intermediate age

Data

🔍 Search references for Bochum 9 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	–	158.872	-60.15	0.208	-5.421	2.569	-0.826
Just et al.	2023	158.92	-60.126	–	–	–	–
Kharchenko et al.	2016	158.92	-60.126	–	–	–	–
Dias et al.	2014	158.942	-60.117	–	-6.38	-2.51	-9.82
Kharchenko et al.	2013	158.925	-60.13	–	-10.2	-0.23	–
Piskunov et al.	2008	158.934	-60.115	–	–	–	–
van den Bergh	2006	158.94	-60.126	–	–	–	–
Kharchenko et al.	2005	158.94	-60.12	–	-10.46	1.34	–
Kharchenko et al.	2003	158.95	-60.12	–	-8.98	0.36	–
Dias et al.	2002	158.942	-60.117	–	-6.38	-2.51	-9.82

💡 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	–	–	–	123	–	28	–	–
Kharchenko et al.	2016	0.94	0.34	–	123	–	–	–	–
Kharchenko et al.	2013	0.94	0.34	–	123	–	–	–	–
Piskunov et al.	2008	0.71	0.34	–	240	–	–	–	–
van den Bergh	2006	4.60	1.95	–	–	–	–	–	–
Kharchenko et al.	2005	0.71	0.34	–	240	–	–	–	–
Kharchenko et al.	2003	4.60	1.95	–	–	–	–	–	–
Dias et al.	2002	0.71	0.34	–	240	–	–	–	–

Visualization

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