OC 0189

0.17 UTI

0.0

C_N

0.48

C_dens

0.25

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 0.9 [pc], 2.4 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.48 Loose
C_C3 0.25 Low quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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OC 0189 is a sparse, loose object of low C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is rarely 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 Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.07 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.07 (50th percentile).

Data

🔍 Search references for OC 0189 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–	336.299	62.313	0.554	-4.126	-3.878	–
Hunt & Reffert	2024	336.291	62.327	0.552	-4.128	-3.913	–
Cavallo et al.	2024	336.3	62.312	0.555	–	–	–
Hunt & Reffert	2023	336.291	62.327	0.552	-4.128	-3.913	–
Hao et al.	2022	336.276	62.309	0.556	-4.154	-3.835	–

💡 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–	1.69	3.485	2.62	163	0.398	214	–	–
Hunt & Reffert	2024	1.69	3.56	2.62	255	–	214⁽¹⁾	–	–
Cavallo et al.	2024	2.19	3.41	–	71	0.530	–	–	–
Hunt & Reffert	2023	1.69	3.56	2.62	255	–	–	–	–
Hao et al.	2022	–	0.48	–	8	0.265	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 505	96.0	336.31	62.33	0.55	-4.15	-3.87	11.96	0.06

💡 Note: The % column shows the percentage of members that OC 0189 shares with each listed object.

Visualization

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