UBC 218

0.16 UTI

0.0

C_N

0.01

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 20

Core radius and density 6.2 [pc], 0.04 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.75 High quality
C_lit 0.03 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 218 is a sparse, very loose object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a young cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 6 years.

Note: This object shares a moderate percentage of members with 4 later reported entries. See table with shared members information.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Moderate extinction Young

Data

🔍 Search references for UBC 218 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–	106.523	-9.181	0.352	-1.182	0.89	–
Cantat-Gaudin et al.	2020	106.514	-9.163	0.345	-1.175	0.871	–
Castro-Ginard et al.	2020	106.539	-9.18	0.348	-1.192	0.876	–

💡 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–	2.92	1.35	–	21	–	–	–	–
Cantat-Gaudin et al.	2020	2.70	1.01	–	31	–	–	–	–
Kounkel et al.	2020	3.14	1.69	–	11	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0375	44.0	106.76	-9.17	0.37	-1.17	0.91	–	0.18
Teutsch J0706.0 0907	36.0	106.76	-9.18	0.37	-1.17	0.92	–	0.08
Theia 1774	36.0	106.74	-9.17	0.37	-1.17	0.91	–	0.01
CWWDL 4703	24.0	106.42	-9.12	0.35	-1.09	0.89	–	0.08

💡 Note: The % column shows the percentage of members that UBC 218 shares with each listed object.

Visualization

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