Theia 708

0.24 UTI

0.52

C_N

0.1

C_dens

0.38

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 53

Core radius and density 1.9 [pc], 0.5 [pc^-2]

C3 classification CB

C_N 0.52 Moderately populated
C_dens 0.1 Very loose
C_C3 0.38 Low 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

ℹ️

Theia 708 is a moderately populated, very loose object of low C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (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 Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.12 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.12 (50th percentile).

Data

🔍 Search references for Theia 708 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	290.923	53.231	2.187	1.045	-2.183	-24.949
Hu & Soubiran	2025	291.17	53.457	–	–	–	–
Zhang et al.	2024	290.949	53.291	–	–	–	–
Cavallo et al.	2024	291.17	53.457	2.186	–	–	–
Hunt & Reffert	2023	290.949	53.291	2.176	1.093	-2.159	-25.294
Kounkel & Covey	2019	293.01	52.744	2.361	–	–	-8.087

💡 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–	0.44	0.12	0.54	439	-0.001	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.320⁽⁵⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.001⁽¹⁾	–	–	–
Cavallo et al.	2024	0.46	0.33	–	871	0.230	–	–	–
Hunt & Reffert	2023	0.44	0.09	0.54	439	–	–	–	–
Kounkel & Covey	2019	0.42	0.12	–	322	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 1187	45.3	291.35	53.68	2.18	1.07	-2.08	-26.15	0.01

💡 Note: The % column shows the percentage of members that Theia 708 shares with each listed object.

Visualization

ℹ️

1 2