Theia 446

0.26 UTI

0.33

C_N

0.28

C_dens

0.5

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 33

Core radius and density 1.2 [pc], 1.4 [pc^-2]

C3 classification BB

C_N 0.33 Poorly populated
C_dens 0.28 Loose
C_C3 0.5 Intermediate quality
C_lit 0.1 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 446 is a poorly populated, 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 is rarely studied 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.

Very close Low extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.69 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.69 (50th percentile).

Data

🔍 Search references for Theia 446 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–	18.391	62.725	2.573	7.78	-3.729	-3.667
Zhang et al.	2024	18.552	62.757	–	–	–	–
Cavallo et al.	2024	18.471	62.448	2.606	–	–	–
Hunt & Reffert	2023	18.552	62.757	2.6	7.731	-3.698	-3.616
He et al.	2022	19.13	62.233	2.612	7.862	-4.104	–
Kounkel & Covey	2019	15.863	62.567	2.414	–	–	-1.19

💡 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–	0.39	0.725	1.15	76	0.028	–	–	–
Zhang et al.	2024	–	–	–	–	0.115⁽¹⁾	–	–	–
Cavallo et al.	2024	0.39	1.10	–	42	-0.060	–	–	–
Hunt & Reffert	2023	0.37	0.55	1.15	80	–	–	–	–
He et al.	2022	–	0.90	–	71	–	–	–	–
Kounkel & Covey	2019	0.43	0.47	–	185	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 45	30.3	21.03	62.02	2.61	7.83	-4.1	-3.02	0.05

💡 Note: The % column shows the percentage of members that Theia 446 shares with each listed object.

Visualization

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