UPK 369

0.19 UTI

0.0

C_N

0.15

C_dens

0.38

C_C3

0.23

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 1.9 [pc], 0.7 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.15 Very loose
C_C3 0.38 Low quality
C_lit 0.23 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 369 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, near 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.

⚠️ 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 Moderate extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 192 along with HSC_1385.

Palma et al. (2025)
Classified as optical pair P427, along with HSC_1385.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for UPK 369 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–	83.543	30.342	1.363	0.017	-2.901	-14.187
Yang et al.	2025	83.505	30.351	–	–	–	–
Zhang et al.	2024	83.505	30.351	–	–	–	–
Hunt & Reffert	2024	83.505	30.351	1.323	0.1	-2.915	-25.502
Cavallo et al.	2024	83.62	30.28	1.322	–	–	–
Hunt & Reffert	2023	83.505	30.351	1.323	0.1	-2.915	-25.502
Cantat-Gaudin et al.	2020	83.565	30.475	1.35	0.038	-2.865	–
Cantat-Gaudin & Anders	2020	83.559	30.632	1.344	0.07	-2.749	–
Sim et al.	2019	83.578	30.441	–	0.08	-2.89	–

💡 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–	0.73	1.39	0.87	136	-0.042	88	–	–
Liu et al.	2025	1.56	0.57	–	87	–	–	–	–
Yang et al.	2025	–	–	–	135	-0.080⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.042⁽¹⁾	–	–	–
Hunt & Reffert	2024	0.71	1.39	0.87	135	–	88⁽¹⁾	–	–
Cavallo et al.	2024	0.76	1.50	–	209	0.290	–	–	–
Hunt & Reffert	2023	0.71	1.39	0.87	136	–	–	–	–
Cantat-Gaudin & Anders	2020	0.73	–	–	–	–	–	–	–
Sim et al.	2019	0.73	–	–	708	–	–	–	–

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

Visualization

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