Theia 1918

0.03 UTI

0.0

C_N

0.19

C_dens

0.5

C_C3

0.0

C_lit

0.2

C_dup

N₅₀ (P>50% members) 24

Stellar density (N₅₀/rad) 1.0 [N/pc²]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.19 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.0 Rarely studied
C_dup 0.2 Likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 1918 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 359 along with NGC_2547, and of multiple system 76 along with Pozzo_1, NGC_2547 and OC_0479.

Palma et al. (2025)
Part of multiple system G217, along with NGC_2547, OC_0479 and Pozzo_1.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for Theia 1918 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–	129.259	-48.129	2.446	-10.479	2.242	11.516
Liu et al.	2025	129.2	-48.12	2.44	-10.64	2.0	11.44
Cavallo et al.	2024	130.539	-47.925	2.445	–	–	–
Hunt & Reffert	2023	129.195	-48.117	2.44	-10.636	2.0	11.439

💡 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–	0.42	0.23	0.67	24	-0.160	–	–	–
Liu et al.	2025	0.46	0.11	–	37	–	–	–	–
Cavallo et al.	2024	0.42	0.57	–	12	-0.160	–	–	–
Hunt & Reffert	2023	0.40	0.23	0.67	24	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 1101	80.0	130.24	-47.93	2.41	-10.48	2.06	11.16	0.19

💡 Note: The % column shows the percentage of members that Theia 1918 shares with each listed object.

Visualization

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