Theia 1802

0.08 UTI

0.0

C_N

0.04

C_dens

0.25

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 19

Core radius and density 4.2 [pc], 0.2 [pc^-2]

C3 classification DB

C_N 0.0 Sparse
C_dens 0.04 Very loose
C_C3 0.25 Low quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 1802 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.

⚠️ 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 High extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.16 (50th percentile), true positive? (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.16 (50th percentile), true positive? (human-assigned).

Data

🔍 Search references for Theia 1802 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–	89.836	20.746	0.304	-0.083	-1.477	–
Zhang et al.	2024	89.863	20.716	–	–	–	–
Hunt & Reffert	2024	89.863	20.716	0.29	-0.138	-1.469	89.276
Cavallo et al.	2024	89.663	20.935	0.292	–	–	–
Hunt & Reffert	2023	89.863	20.716	0.29	-0.138	-1.469	89.276

💡 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–	2.94	3.27	2.82	22	0.409	241	–	–
Zhang et al.	2024	–	–	–	–	0.088⁽¹⁾	–	–	–
Hunt & Reffert	2024	2.94	3.28	2.82	22	–	241⁽¹⁾	–	–
Cavallo et al.	2024	4.15	2.99	–	35	0.730	–	–	–
Hunt & Reffert	2023	2.94	3.27	2.82	22	–	–	–	–

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

Visualization

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