UPK 155

0.50 UTI

0.31

C_N

0.3

C_dens

0.5

C_C3

0.7

C_lit

1.0

C_dup

C3 classification BB

Number of members (P>50%) 31

Radius (P>50% members) 17.0 [arcmin]

C_N 0.31 Poorly populated
C_dens 0.3 Loose
C_C3 0.5 Intermediate quality
C_lit 0.7 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

ℹ️

UPK 155 is a poorly populated, loose object of intermediate C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low 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 moderately studied in the literature.

Close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UPK 155 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	311.475	60.913	1.091	-2.217	-3.9	-19.354
Li et al.	2025	311.731	60.867	1.096	-2.255	-3.856	–
Almeida et al.	2025	311.719	60.796	–	–	–	–
Alfonso et al.	2024	311.322	60.643	1.078	-2.575	-3.918	–
Hunt & Reffert	2024	311.237	60.748	1.09	-2.2	-3.877	-20.757
Cavallo et al.	2024	311.623	60.883	1.091	–	–	–
Hunt & Reffert	2023	311.237	60.748	1.09	-2.2	-3.877	-20.757
Almeida et al.	2023	311.706	60.744	–	–	–	–
Dias et al.	2021	311.719	60.796	1.099	-2.268	-3.862	–
Cantat-Gaudin et al.	2020	311.731	60.867	1.096	-2.255	-3.856	–
Cantat-Gaudin & Anders	2020	311.656	60.867	1.089	-2.293	-3.904	–
Sim et al.	2019	311.706	60.901	–	-2.24	-3.86	–

💡 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]	Bfr	BSS
Li et al.	2025	0.83	1.00	–	201	-0.141	–	–	–
Almeida et al.	2025	0.88	1.17	–	72	–	69	–	–
Alfonso et al.	2024	0.84	0.69	–	224	0.011	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	51*	–	–
Cavallo et al.	2024	0.92	1.00	–	58	0.300	–	–	–
Hunt & Reffert	2023	0.86	0.97	0.81	46	–	–	–	–
Almeida et al.	2023	0.87	1.25	–	157	0.002	260*	0.66	–
Tarricq et al.	2022	0.82	–	–	229	–	–	–	–
Dias et al.	2021	0.88	1.17	–	72	0.010	–	–	–
Cantat-Gaudin et al.	2020	0.84	0.69	–	214	–	–	–	–
Cantat-Gaudin & Anders	2020	0.89	–	–	–	–	–	–	–
Sim et al.	2019	0.89	–	–	35	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

ℹ️

1 2 3