Theia 984

0.46 UTI

0.68

C_N

0.5

C_dens

1.0

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 85

Core radius and density 1.6 [pc], 2.5 [pc^-2]

C3 classification AA

C_N 0.68 Moderately populated
C_dens 0.5 Moderately dense
C_C3 1.0 Very high 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 984 is a moderately populated, moderately dense object of very 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-poor, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

Close Moderate extinction Metal-poor Intermediate age

Palma et al. (2025)
Classified as optical pair P169, along with Theia_1829.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for Theia 984 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–	278.528	-13.157	0.921	0.996	0.482	2.775
Hunt & Reffert	2024	278.533	-13.147	0.922	0.967	0.459	1.203
Cavallo et al.	2024	278.496	-13.183	0.926	–	–	–
Hunt & Reffert	2023	278.533	-13.147	0.922	0.967	0.459	1.203
Kounkel & Covey	2019	277.534	-12.743	1.311	–	–	-0.445

💡 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–	0.99	1.42	0.57	201	-0.660	334	–	–
Hunt & Reffert	2024	1.03	1.31	0.57	201	–	334⁽¹⁾	–	–
Cavallo et al.	2024	0.95	1.87	–	195	-0.660	–	–	–
Hunt & Reffert	2023	1.03	1.31	0.57	201	–	–	–	–
Kounkel & Covey	2019	0.76	1.53	–	509	–	–	–	–

(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 14360	84.7	278.51	-13.17	0.92	1.0	0.48	-2.23	0.03
FoF 2293	34.1	278.45	-13.16	0.92	0.98	0.49	-2.43	0.0

💡 Note: The % column shows the percentage of members that Theia 984 shares with each listed object.

Visualization

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