UPK 178

0.62 UTI

0.55

C_N

0.64

C_dens

0.75

C_C3

0.57

C_lit

1.0

C_dup

N_m (P>50%) 59

Core radius and density 1.7 [pc], 3.2 [pc^-2]

C3 classification AB

C_N 0.55 Moderately populated
C_dens 0.64 Moderately dense
C_C3 0.75 High quality
C_lit 0.57 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 178 is a moderately populated, moderately dense object of high C3 quality. Its parallax locates it at a close distance, above 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 absorption, age, and metallicity parameters (see Parameters). It is moderately studied in the literature.

Close Moderate extinction Near-solar metallicity Intermediate age

Li et al. (2026)
Tidal & Core radii: r_t=165+/-68.2 [pc], r_c=0.32+/-0.0 [pc]; stars within r_t: N~66

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 356 along with Theia_1474.

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for UPK 178 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–	334.469	60.086	1.045	-4.279	-3.386	-24.756
Li et al.	2026	334.48	60.08	–	–	–	–
Almeida et al.	2025	334.438	60.084	–	–	–	–
Alfonso et al.	2024	334.479	60.071	1.015	-4.274	-3.413	–
Hunt & Reffert	2024	334.45	60.08	1.048	-4.288	-3.394	-20.199
Cavallo et al.	2024	334.431	60.097	1.042	–	–	–
Hunt & Reffert	2023	334.45	60.08	1.048	-4.288	-3.394	-20.199
Almeida et al.	2023	334.45	60.071	–	–	–	–
He et al.	2022	334.433	60.079	1.042	-4.294	-3.421	–
Tarricq et al.	2022	334.507	60.065	1.053	-4.298	-3.422	–
Dias et al.	2021	334.438	60.084	1.04	-4.314	-3.372	–
Cantat-Gaudin et al.	2020	334.479	60.071	1.039	-4.297	-3.322	–
Cantat-Gaudin & Anders	2020	334.462	60.069	1.035	-4.356	-3.314	–
Sim et al.	2019	334.458	60.077	–	-4.34	-3.36	–

💡 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	2.33	1.3	148	0.070	132	0.76	–
Liu et al.	2025	2.44	0.82	–	138	–	–	–	–
Almeida et al.	2025	0.91	2.33	–	148	–	74	–	–
Alfonso et al.	2024	0.96	1.80	–	225	0.019	–	–	–
Hunt & Reffert	2024	0.92	2.42	1.30	125	–	232⁽¹⁾	–	–
Cavallo et al.	2024	1.01	2.49	–	110	0.350	–	–	–
Hunt & Reffert	2023	0.92	2.42	1.30	125	–	–	–	–
Almeida et al.	2023	0.92	2.27	–	151	0.120	132⁽¹⁾	0.76	–
He et al.	2022	–	2.75	–	40	–	–	–	–
Tarricq et al.	2022	0.94	–	–	224	–	–	–	–
Dias et al.	2021	0.91	2.33	–	148	0.019	–	–	–
Cantat-Gaudin et al.	2020	0.96	1.80	–	204	–	–	–	–
Cantat-Gaudin & Anders	2020	0.94	–	–	–	–	–	–	–
Sim et al.	2019	0.95	–	–	316	–	–	–	–

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

Visualization

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