OC 0289

0.16 UTI

0.0

C_N

0.18

C_dens

0.38

C_C3

0.13

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 1.6 [pc], 0.9 [pc^-2]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.18 Very loose
C_C3 0.38 Low quality
C_lit 0.13 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 0289 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (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 Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.89 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.89 (50th percentile).

Data

🔍 Search references for OC 0289 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–	74.361	32.768	0.727	2.351	-5.764	7.064
Yang et al.	2025	74.343	32.757	–	–	–	–
Zhang et al.	2024	74.343	32.757	–	–	–	–
Hunt & Reffert	2024	74.343	32.757	0.725	2.297	-5.691	6.053
Cavallo et al.	2024	74.49	32.751	0.726	–	–	–
Hunt & Reffert	2023	74.343	32.757	0.725	2.297	-5.691	6.053
Hao et al.	2022	74.29	32.757	0.717	2.334	-5.751	9.24

💡 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–	1.29	2.33	1.7	414	0.028	391	–	–
Yang et al.	2025	–	–	–	417	-0.050⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	0.033⁽¹⁾	–	–	–
Hunt & Reffert	2024	1.29	2.29	1.70	414	–	391⁽¹⁾	–	–
Cavallo et al.	2024	1.37	2.37	–	380	0.320	–	–	–
Hunt & Reffert	2023	1.29	2.29	1.70	414	–	–	–	–
Hao et al.	2022	–	4.89	–	200	0.022	–	–	–

(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 424	84.0	74.41	32.78	0.73	2.32	-5.74	6.82	0.02

💡 Note: The % column shows the percentage of members that OC 0289 shares with each listed object.

Visualization

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