Theia 2118

0.18 UTI

0.0

C_N

0.28

C_dens

0.12

C_C3

0.25

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 17

Radius (P>50% members) 7.7 [arcmin]

C_N 0.0 Sparse
C_dens 0.28 Loose
C_C3 0.12 Very low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

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

Overview

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Theia 2118 is a sparse, loose object of very low C3 quality. Its parallax locates it at a relatively close distance, above 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 was recently reported in the literature.

Note: This object shares a small percentage of members with a later reported entry. 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 Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 2118 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	–	101.736	7.365	0.638	-1.54	0.207	-4.665
Zhang et al.	2024	101.739	7.387	–	–	–	–
Hunt & Reffert	2024	101.739	7.387	0.679	-1.644	0.186	48.972
Cavallo et al.	2024	101.113	7.793	0.678	–	–	–
Hunt & Reffert	2023	101.739	7.387	0.679	-1.644	0.186	48.972

💡 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
Zhang et al.	2024	–	–	–	–	-0.184*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	66*	–	–
Cavallo et al.	2024	1.67	1.25	–	123	0.400	–	–	–
Hunt & Reffert	2023	1.38	1.08	2.40	157	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 4106	20.0	101.68	7.54	0.65	-1.54	0.53	–	0.12

💡 Note: The % column shows the percentage of members that Theia 2118 shares with each listed object.

Visualization

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