Theia 850

0.16 UTI

0.27

C_N

0.17

C_dens

0.38

C_C3

0.0

C_lit

1.0

C_dup

C3 classification CB

Number of members (P>50%) 27

Radius (P>50% members) 30.8 [arcmin]

C_N 0.27 Poorly populated
C_dens 0.17 Very loose
C_C3 0.38 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

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

Overview

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Theia 850 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It was recently reported in the literature.

Note: This object shares a moderate 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.

Close Moderate extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 850 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	–	26.495	66.908	1.607	-5.599	-0.344	-19.939
Hunt & Reffert	2024	26.424	66.868	1.607	-5.577	-0.383	-21.8
Cavallo et al.	2024	25.413	67.123	1.6	–	–	–
Hunt & Reffert	2023	26.424	66.868	1.607	-5.577	-0.383	-21.8

💡 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
Hunt & Reffert	2024	–	–	–	–	–	83*	–	–
Cavallo et al.	2024	0.68	1.93	–	24	0.060	–	–	–
Hunt & Reffert	2023	0.59	1.74	1.99	37	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 4778	33.3	24.14	67.22	1.61	-5.68	-0.5	-23.51	0.08

💡 Note: The % column shows the percentage of members that Theia 850 shares with each listed object.

Visualization

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