Bochum 9

(MWSC 1825)

0.20 UTI

0.0

C_N

0.03

C_dens

0.12

C_C3

0.42

C_lit

1.0

C_dup

N_m (P>50%) 14

Core radius and density 2.9 [pc], 0.1 [pc^-2]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.12 Very low quality
C_lit 0.42 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 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 an intermediate-age cluster (see Parameters). It is poorly 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 Intermediate age

Bica et al. (2019)
Asterisms and cluster alikes by B. Alessi reported in DAML02.

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	99999–	158.872	-60.15	0.208	-5.421	2.569	-0.826
Just et al.	2023	158.92	-60.126	–	–	–	–
Dib et al.	2018	158.925	-60.13	–	–	–	–
Sampedro et al.	2017	158.942	-60.117	–	-6.26	-2.54	–
Joshi et al.	2016	158.925	-60.13	–	–	–	–
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	–
Bukowiecki et al.	2011	158.925	-60.15	–	–	–	–
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
Lynga	1987	158.942	-60.129	–	–	–	–

💡 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–	0.94	0.35	–	123	–	66	–	–
Just et al.	2023	–	–	–	123	–	28	–	–
Dib et al.	2018	0.94	–	–	123	–	–	–	–
Joshi et al.	2016	0.94	0.35	–	123	–	66	–	–
Kharchenko et al.	2016	0.94	0.35	–	123	–	–	–	–
Kharchenko et al.	2013	0.94	0.35	–	123	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	674	–	–
Bukowiecki et al.	2011	3.01⁽¹⁾	2.43	–	14	–	–	–	–
Piskunov et al.	2008	0.71	0.35	–	240	–	–	–	–
van den Bergh	2006	4.60	1.99	–	–	–	–	–	–
Kharchenko et al.	2005	0.71	0.35	–	240	–	–	–	–
Kharchenko et al.	2003	4.60	1.99	–	–	–	–	–	–
Dias et al.	2002	0.71	0.35	–	240	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

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