Theia 1858

0.13 UTI

0.75

C_N

0.24

C_dens

0.75

C_C3

0.03

C_lit

0.36

C_dup

N_m (P>50%) 108

Core radius and density 2.3 [pc], 1.2 [pc^-2]

C3 classification AB

C_N 0.75 Rich
C_dens 0.24 Very loose
C_C3 0.75 High quality
C_lit 0.03 Rarely studied
C_dup 0.36 Possibly duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 1858 is a rich, very loose object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, young cluster (see Parameters). It was recently reported in the literature.

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

Relatively close Moderate extinction Metal-rich Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.14 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.14 (50th percentile).

Data

🔍 Search references for Theia 1858 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–	135.75	-46.727	0.87	-6.089	3.987	8.702
Hunt & Reffert	2024	135.734	-46.726	0.854	-6.045	3.961	19.058
Cavallo et al.	2024	135.676	-46.698	0.856	–	–	–
Hunt & Reffert	2023	135.734	-46.726	0.854	-6.045	3.961	19.058

💡 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–	1.12	2.96	2.72	29	0.690	476	–	–
Hunt & Reffert	2024	1.12	2.96	2.72	29	–	476⁽¹⁾	–	–
Cavallo et al.	2024	1.32	2.85	–	41	0.690	–	–	–
Hunt & Reffert	2023	1.12	2.96	2.72	29	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 14384	63.9	135.76	-46.73	0.87	-6.11	4.01	12.22	0.19
OC 0496	25.9	135.71	-46.74	0.87	-6.08	4.02	26.5	0.19
CWNU 188	23.1	135.69	-46.73	0.88	-6.11	4.01	26.5	0.02

💡 Note: The % column shows the percentage of members that Theia 1858 shares with each listed object.

Visualization

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