UBC 217

0.71 UTI

0.7

C_N

1.0

C_dens

0.75

C_C3

0.55

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 90

Radius (P>50% members) 3.1 [arcmin]

C_N 0.7 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.55 Moderately studied
C_dup 1.0 Unique

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

Overview

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UBC 217 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate 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.

Note: This object shares a moderate percentage of members with a later reported entry. See table with shared members information.

Relatively close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 217 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	–	108.214	-4.692	0.381	-2.577	2.201	93.363
Hu & Soubiran	2025	108.21	-4.687	–	–	–	–
Almeida et al.	2025	108.211	-4.69	–	–	–	–
Zhang et al.	2024	108.21	-4.694	–	–	–	–
Hunt & Reffert	2024	108.21	-4.694	0.38	-2.577	2.198	101.995
Cavallo et al.	2024	108.21	-4.687	0.381	–	–	–
Hunt & Reffert	2023	108.21	-4.694	0.38	-2.577	2.198	101.995
Dias et al.	2021	108.211	-4.69	0.393	-2.594	2.149	–
Cantat-Gaudin et al.	2020	108.213	-4.692	0.377	-2.608	2.146	–
Castro-Ginard et al.	2020	108.205	-4.686	0.379	-2.61	2.139	–

💡 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
Hu & Soubiran	2025	–	–	–	–	-0.280*	–	–	–
Almeida et al.	2025	2.52	0.57	–	834	–	184	–	–
Zhang et al.	2024	–	–	–	–	-0.341*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	344*	–	–
Cavallo et al.	2024	2.00	0.83	–	1000	-0.660	–	–	–
Hunt & Reffert	2023	2.33	0.18	0.83	1274	–	–	–	–
Dias et al.	2021	2.52	0.57	–	834	-0.269	–	–	–
Cantat-Gaudin et al.	2020	2.63	0.36	–	794	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 10891	50.0	108.21	-4.69	0.37	-2.58	2.2	90.78	0.0

💡 Note: The % column shows the percentage of members that UBC 217 shares with each listed object.

Visualization

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