Theia 1643

0.20 UTI

0.81

C_N

1.0

C_dens

0.75

C_C3

0.0

C_lit

0.38

C_dup

N₅₀ (P>50% members) 252

Stellar density (N₅₀/rad) 22.6 [N/pc²]

C3 classification AB

C_N 0.81 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.0 Rarely studied
C_dup 0.38 Possibly duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 1643 is a rich, very dense 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 massive, near-solar metallicity, very young cluster (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is possibly a duplicate object, which shares a significant percentage of members with at least one previously reported entry, and a very small percentage with at least one entry reported in the same catalogue. See table with shared members information.

Relatively close Moderate extinction Massive Near-solar metallicity Very young

Palma et al. (2025)
Part of multiple system G165, along with HSC_2785, HSC_2778, NGC_6134, NGC_6193, NGC_6204 and CWNU_1842.

Cavallo et al. (2024)
Silver sample.

Data

🔍 Search references for Theia 1643 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–	250.306	-48.972	0.845	0.804	-4.526	-28.041
Hunt & Reffert	2024	250.33	-49.059	0.84	0.66	-4.619	-20.943
Cavallo et al.	2024	250.41	-49.058	0.848	–	–	–
Hunt & Reffert	2023	250.33	-49.059	0.84	0.66	-4.619	-20.943

💡 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–	1.09	2.365	2.73	9	-0.030	1225	–	–
Hunt & Reffert	2024	–	–	–	–	–	1225⁽¹⁾	–	–
Cavallo et al.	2024	1.08	2.35	–	13	-0.030	–	–	–
Hunt & Reffert	2023	1.10	2.38	2.73	5	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
NGC 6193	61.5	250.32	-48.78	0.82	1.28	-4.06	-27.74	0.95
CWNU 1268	9.9	250.64	-49.05	0.88	0.42	-4.74	-21.24	0.32
VVV 084	9.9	250.34	-48.97	0.82	1.02	-4.38	-37.33	0.0
VVV 083	9.5	250.31	-49.01	0.85	0.84	-4.37	-27.3	0.02
HSC 2785	2.0	249.57	-48.8	0.83	1.25	-4.27	-19.26	0.48

💡 Note: The % column shows the percentage of members that Theia 1643 shares with each listed object.

Visualization

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