Theia 2045

0.23 UTI

0.27

C_N

0.13

C_dens

0.75

C_C3

0.25

C_lit

0.7

C_dup

N₅₀ (P>50% members) 27

Stellar density (N₅₀/rad) 0.7 [N/pc²]

C3 classification BA

C_N 0.27 Poorly populated
C_dens 0.13 Very loose
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 0.7 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Theia 2045 is a poorly populated, very loose object of 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 very metal-poor, young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It was recently reported in the literature.

Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close Moderate extinction Very metal-poor Young

Liu et al. (2025)
Classified as primordial binary cluster 113 along with CWNU_2188.

Palma et al. (2025)
Part of multiple system G49, along with CWNU_1409, OC_0018 and CWNU_2188.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 2045 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–	273.648	-18.869	0.518	0.323	-1.576	0.582
Hunt & Reffert	2024	273.654	-18.791	0.522	0.309	-1.574	0.582
Cavallo et al.	2024	273.521	-18.975	0.522	–	–	–
Hunt & Reffert	2023	273.654	-18.791	0.522	0.309	-1.574	0.582

💡 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–	1.83	1.26	1.93	28	-1.470	223	–	–
Liu et al.	2025	2.83	0.47	–	22	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	223⁽¹⁾	–	–
Cavallo et al.	2024	1.49	1.72	–	72	-1.470	–	–	–
Hunt & Reffert	2023	1.83	1.26	1.93	28	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0020	29.6	273.46	-19.02	0.53	0.27	-1.61	0.58	0.18

💡 Note: The % column shows the percentage of members that Theia 2045 shares with each listed object.

Visualization

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