UBC 618

0.40 UTI

0.33

C_N

0.14

C_dens

1.0

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 33

Core radius and density 2.4 [pc], 0.7 [pc^-2]

C3 classification AA

C_N 0.33 Poorly populated
C_dens 0.14 Very loose
C_C3 1.0 Very high quality
C_lit 0.26 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 618 is a poorly populated, very loose object of very high C3 quality. Its parallax locates it at a large distance, below 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 poorly studied in the literature.

Very distant Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Data

🔍 Search references for UBC 618 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–	96.24	7.601	0.156	0.236	0.044	38.027
Otto et al.	2026	96.238	7.618	–	0.25	0.06	37.5
Almeida et al.	2025	96.259	7.612	–	–	–	–
Hunt & Reffert	2024	96.238	7.618	0.14	0.224	0.039	38.028
Cavallo et al.	2024	96.249	7.6	0.136	–	–	–
Hunt & Reffert	2023	96.238	7.618	0.14	0.224	0.039	38.028
Jadhav & Subramaniam	2021	96.241	7.617	–	–	–	–
Dias et al.	2021	96.259	7.612	0.144	0.25	0.018	37.319
Cantat-Gaudin et al.	2020	96.241	7.617	0.132	0.251	0.062	–
Castro-Ginard et al.	2020	96.259	7.618	0.133	0.235	0.051	–

💡 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–	5.2	1.515	0.68	358	-0.440	484	–	0
Otto et al.	2026	–	–	–	724	-0.450⁽¹⁵⁾	–	–	–
Almeida et al.	2025	5.39	1.55	–	358	–	484	–	–
Hunt & Reffert	2024	6.80	1.48	0.68	268	–	513⁽¹⁾	–	–
Cavallo et al.	2024	4.85	1.81	–	219	-0.440	–	–	–
Hunt & Reffert	2023	6.80	1.48	0.68	268	–	–	–	–
Jadhav & Subramaniam	2021	5.01	0.90	–	724	–	470	–	0⁽¹⁾
Dias et al.	2021	5.39	1.55	–	358	-0.104	–	–	–
Cantat-Gaudin et al.	2020	5.01	0.90	–	724	–	–	–	–
Kounkel et al.	2020	4.71	1.75	–	347	–	–	–	–

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

Visualization

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