UPK 55

0.73 UTI

0.64

C_N

0.88

C_dens

0.75

C_C3

0.7

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 77

Radius (P>50% members) 18.1 [arcmin]

C_N 0.64 Moderately populated
C_dens 0.88 Dense
C_C3 0.75 High quality
C_lit 0.7 Moderately studied
C_dup 1.0 Unique

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

Overview

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UPK 55 is a moderately populated, dense object of high C3 quality. Its parallax locates it at a close distance, below 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 age and metallicity parameters (see Parameters). It is moderately studied in the literature.

Close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UPK 55 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	–	296.809	10.421	1.261	-1.438	-6.908	-9.477
Li et al.	2025	296.812	10.428	1.252	-1.383	-6.87	–
Almeida et al.	2025	296.798	10.421	–	–	–	–
Alfonso et al.	2024	296.723	10.487	1.217	-1.423	-6.868	–
Hunt & Reffert	2024	296.669	10.433	1.243	-1.437	-6.885	-15.757
Cavallo et al.	2024	296.799	10.451	1.248	–	–	–
Hunt & Reffert	2023	296.669	10.433	1.243	-1.437	-6.885	-15.757
Almeida et al.	2023	296.773	10.434	–	–	–	–
Tarricq et al.	2022	296.844	10.401	1.258	-1.441	-6.884	–
Dias et al.	2021	296.798	10.421	1.253	-1.386	-6.86	–
Cantat-Gaudin et al.	2020	296.812	10.428	1.252	-1.383	-6.87	–
Cantat-Gaudin & Anders	2020	296.768	10.421	1.251	-1.411	-6.859	–
Sim et al.	2019	296.7	10.463	–	-1.43	-6.86	–

💡 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	0.79	0.41	–	404	0.353	–	–	–
Almeida et al.	2025	0.77	0.74	–	247	–	135	–	–
Alfonso et al.	2024	0.77	0.54	–	223	0.042	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	208*	–	–
Cavallo et al.	2024	0.81	0.72	–	115	0.400	–	–	–
Hunt & Reffert	2023	0.76	0.68	1.30	95	–	–	–	–
Almeida et al.	2023	0.78	0.76	–	308	-0.048	192*	0.68	–
Tarricq et al.	2022	0.76	–	–	251	–	–	–	–
Dias et al.	2021	0.77	0.74	–	247	0.042	–	–	–
Cantat-Gaudin et al.	2020	0.77	0.54	–	214	–	–	–	–
Cantat-Gaudin & Anders	2020	0.78	–	–	–	–	–	–	–
Sim et al.	2019	0.78	–	–	89	–	–	–	–

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

Visualization

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