Theia 123

0.26 UTI

0.0

C_N

0.53

C_dens

0.62

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 1.3 [pc], 2.7 [pc^-2]

C3 classification CA

C_N 0.0 Sparse
C_dens 0.53 Moderately dense
C_C3 0.62 Intermediate 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 123 is a sparse, moderately dense object of intermediate C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by moderate 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 large percentage of members with 3 later reported entries. See table with shared members information.

Very close Moderate extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P409, along with HSC_1062.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.84 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.84 (50th percentile).

Data

🔍 Search references for Theia 123 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–	43.342	68.859	2.269	1.38	-7.934	-5.675
Hunt & Reffert	2024	43.369	68.84	2.283	1.463	-7.911	-7.683
Cavallo et al.	2024	42.928	68.862	2.281	–	–	–
Hunt & Reffert	2023	43.369	68.84	2.283	1.463	-7.911	-7.683
Kounkel & Covey	2019	42.288	68.622	2.133	–	–	-13.508

💡 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	1.205	2.085	86	0.070	275	–	–
Hunt & Reffert	2024	0.42	1.20	2.09	125	–	275⁽¹⁾	–	–
Cavallo et al.	2024	0.46	1.30	–	46	0.070	–	–	–
Hunt & Reffert	2023	0.42	1.21	2.08	125	–	–	–	–
Kounkel & Covey	2019	0.47	0.96	–	40	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FoF 2428	100.0	43.09	68.86	2.28	1.46	-7.93	-6.86	0.46
OCSN 46	100.0	43.11	68.88	2.28	1.46	-7.95	-6.04	0.0
OC 0242	32.0	42.42	68.98	2.28	1.56	-7.98	-7.13	0.18

💡 Note: The % column shows the percentage of members that Theia 123 shares with each listed object.

Visualization

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