Theia 540

0.16 UTI

0.0

C_N

0.06

C_dens

0.75

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 19

Stellar density (N₅₀/rad) 0.3 [N/pc²]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.75 High quality
C_lit 0.0 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 540 is a sparse, very loose object of high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is rarely studied in the literature.

Note: This object shares a moderate percentage of members with at least one entry reported in the same catalogue. 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.

Low extinction Intermediate age

Data

🔍 Search references for Theia 540 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–	296.618	39.822	2.111	1.47	-0.647	-9.896
He et al.	2022	296.567	39.759	2.127	1.598	-0.582	–

💡 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–	–	0.85	–	794	–	–	–	–
He et al.	2022	–	0.85	–	794	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 1183	36.0	295.93	38.47	2.09	1.42	-0.83	-10.27	0.36
CWNU 1257	12.0	298.61	41.44	2.04	1.51	-0.23	-9.31	0.18

💡 Note: The % column shows the percentage of members that Theia 540 shares with each listed object.

Visualization

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