Theia 2649

0.01 UTI

0.55

C_N

0.3

C_dens

0.75

C_C3

0.06

C_lit

0.02

C_dup

N_m (P>50%) 59

Core radius and density 2.2 [pc], 1.5 [pc^-2]

C3 classification AB

C_N 0.55 Moderately populated
C_dens 0.3 Loose
C_C3 0.75 High quality
C_lit 0.06 Rarely studied
C_dup 0.02 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 2649 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is very likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close Low extinction Near-solar metallicity Intermediate age

Yan et al. (2026)
Number of WDs: expected from single-star evolution N=4, with probability of formation through binary evolution >=0.5 N=0.

Palma et al. (2025)
Part of multiple system G11, along with CMa_2, ASCC_30 and UBC_444.

Cavallo et al. (2024)
Gold sample.

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

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

Data

🔍 Search references for Theia 2649 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–	106.85	-7.665	0.924	-3.942	1.206	32.252
Yan et al.	2026	106.884	-7.665	0.911	-3.935	1.184	–
Hunt & Reffert	2024	106.884	-7.665	0.911	-3.935	1.184	31.628
Cavallo et al.	2024	106.798	-7.651	0.919	–	–	–
Hunt & Reffert	2023	106.884	-7.665	0.911	-3.935	1.184	31.628

💡 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–	1.02	0.18	0.47	133	0.430	166	–	–
Yan et al.	2026	–	–	–	141	–	–	–	–
Hunt & Reffert	2024	1.02	0.18	0.47	133	–	166⁽¹⁾	–	–
Cavallo et al.	2024	1.12	0.40	–	85	0.430	–	–	–
Hunt & Reffert	2023	1.02	0.18	0.47	133	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
PHOC 4	98.3	106.82	-7.65	0.92	-3.94	1.18	33.55	0.33
HXHWL 54	93.2	106.85	-7.66	0.93	-3.94	1.21	32.38	0.0
CMa01	88.1	106.81	-7.67	0.93	-3.93	1.19	32.25	0.0

💡 Note: The % column shows the percentage of members that Theia 2649 shares with each listed object.

Visualization

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