Theia 3995

0.22 UTI

0.26

C_N

0.01

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 2.3 [pc], 0.06 [pc^-2]

C3 classification AB

C_N 0.26 Poorly populated
C_dens 0.01 Very loose
C_C3 0.75 High 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 3995 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a large distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It was recently reported in the literature.

Note: This object shares a large 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.

Very distant Low extinction Near-solar metallicity Intermediate age

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 3995 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–	116.802	-25.231	0.182	-2.125	3.493	105.742
Hunt & Reffert	2024	116.829	-25.242	0.178	-2.119	3.498	105.701
Cavallo et al.	2024	116.799	-25.213	0.179	–	–	–
Hunt & Reffert	2023	116.829	-25.242	0.178	-2.119	3.498	105.701

💡 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–	5.42	0.5	1.0	303	-0.070	150	–	–
Hunt & Reffert	2024	5.42	0.50	1.00	303	–	150⁽¹⁾	–	–
Cavallo et al.	2024	4.61	1.13	–	51	-0.070	–	–	–
Hunt & Reffert	2023	5.42	0.50	1.00	303	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 4632	84.6	116.79	-25.21	0.18	-2.11	3.5	105.74	0.07

💡 Note: The % column shows the percentage of members that Theia 3995 shares with each listed object.

Visualization

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