Theia 1802

0.19 UTI

0.0

C_N

0.18

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

C3 classification DB

Number of members (P>50%) 19

Radius (P>50% members) 4.8 [arcmin]

C_N 0.0 Sparse
C_dens 0.18 Very loose
C_C3 0.25 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

ℹ️

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.

Distant High extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 1802 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	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]	Bfr	BSS
Zhang et al.	2024	–	–	–	–	0.088*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	241*	–	–
Cavallo et al.	2024	4.15	2.99	–	35	0.730	–	–	–
Hunt & Reffert	2023	2.94	3.27	2.82	22	–	–	–	–

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

Visualization

ℹ️

1 2