Theia 1170

0.22 UTI

0.37

C_N

0.19

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 37

Core radius and density 2.3 [pc], 0.9 [pc^-2]

C3 classification BB

C_N 0.37 Poorly populated
C_dens 0.19 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.03 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 1170 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied 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.

Close Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Part of multiple system G147, along with HSC_2266, HSC_2239 and Theia_453.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for Theia 1170 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–	137.804	-54.475	1.463	-10.68	8.215	4.691
Cavallo et al.	2024	137.338	-54.249	1.491	–	–	–
Hunt & Reffert	2023	137.639	-54.555	1.493	-10.746	8.289	8.269
Kounkel & Covey	2019	139.514	-56.077	1.257	–	–	18.404

💡 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–	0.68	0.36	0.84	161	0.370	–	–	–
Cavallo et al.	2024	0.68	0.36	–	71	0.370	–	–	–
Hunt & Reffert	2023	0.64	0.17	0.84	161	–	–	–	–
Kounkel & Covey	2019	0.80	0.52	–	883	–	–	–	–

Visualization

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