Theia 4535

0.09 UTI

0.6

C_N

0.92

C_dens

0.62

C_C3

0.25

C_lit

0.17

C_dup

C3 classification AC

Number of members (P>50%) 71

Radius (P>50% members) 8.9 [arcmin]

C_N 0.6 Moderately populated
C_dens 0.92 Very dense
C_C3 0.62 Intermediate quality
C_lit 0.25 Poorly studied
C_dup 0.17 Likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19 🔍 SciX 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

Theia 4535 is a moderately populated, very dense object of intermediate 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, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is 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

Cavallo et al. (2024): Gold sample.

Data

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	335.544	54.552	0.657	1.678	-2.285	-12.308
Hu & Soubiran	2025	335.447	54.515	–	–	–	–
Hunt & Reffert	2024	335.52	54.563	0.638	1.67	-2.29	-11.303
Cavallo et al.	2024	335.447	54.515	0.653	–	–	–
Hunt & Reffert	2023	335.52	54.563	0.638	1.67	-2.29	-11.303

💡 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]	Bfr	BSS
Hu & Soubiran	2025	–	–	–	–	-0.080*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	283*	–	–
Cavallo et al.	2024	1.67	1.09	–	525	0.250	–	–	–
Hunt & Reffert	2023	1.44	0.79	0.89	388	–	–	–	–

💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.
(*): indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
HXHWL 23	83.1	335.54	54.56	0.66	1.68	-2.29	-12.31	0.46
CWWDL 13357	59.2	335.56	54.56	0.66	1.69	-2.31	-9.35	0.01

💡 Note: The % column shows the percentage of members that Theia 4535 shares with each listed object.

Visualization

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💡 Note: How are the galactocentric plots generated? See FAQ.