Theia 649

0.07 UTI

0.0

C_N

0.01

C_dens

0.25

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 2.2 [pc], 0.07 [pc^-2]

C3 classification DB

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.25 Low 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 649 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, below 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.

Note: This object shares a very small 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.

Close Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for Theia 649 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–	112.559	-51.369	1.529	-4.386	8.451	12.832
Cavallo et al.	2024	111.03	-51.659	1.576	–	–	–
Hunt & Reffert	2023	112.775	-51.328	1.573	-4.37	8.422	14.448
Kounkel & Covey	2019	111.288	-51.814	1.538	–	–	7.647

💡 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–	0.63	0.34	0.68	148	0.290	–	–	–
Cavallo et al.	2024	0.63	0.45	–	148	0.290	–	–	–
Hunt & Reffert	2023	0.61	0.19	0.68	128	–	–	–	–
Kounkel & Covey	2019	0.65	0.34	–	301	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 270	4.0	109.02	-52.22	1.68	-4.24	8.6	15.02	0.05

💡 Note: The % column shows the percentage of members that Theia 649 shares with each listed object.

Visualization

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