Theia 497

0.33 UTI

0.34

C_N

0.62

C_dens

0.5

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 34

Core radius and density 0.8 [pc], 3.1 [pc^-2]

C3 classification BB

C_N 0.34 Poorly populated
C_dens 0.62 Moderately dense
C_C3 0.5 Intermediate quality
C_lit 0.1 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 497 is a poorly populated, moderately dense object of intermediate C3 quality. Its parallax locates it at a moderate^* distance, near the mid-plane, affected by moderate 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 is rarely studied in the literature.

(*): The parallax distance estimate (~3.62 kpc) differs significantly from the median photometric distance (~2.49 kpc).

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.16 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.16 (50th percentile).

Data

🔍 Search references for Theia 497 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–	87.675	27.122	0.276	0.296	-2.142	23.557
Zhang et al.	2024	87.667	27.116	–	–	–	–
Hunt & Reffert	2024	87.667	27.116	0.332	0.287	-2.284	18.932
Cavallo et al.	2024	87.502	27.341	0.336	–	–	–
Hunt & Reffert	2023	87.667	27.116	0.332	0.287	-2.284	18.932
Kounkel & Covey	2019	88.159	26.671	1.172	–	–	-18.895

💡 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–	2.49	2.69	2.49	405	0.231	162	–	–
Zhang et al.	2024	–	–	–	–	-0.048⁽¹⁾	–	–	–
Hunt & Reffert	2024	2.49	2.69	2.49	438	–	162⁽¹⁾	–	–
Cavallo et al.	2024	2.88	2.70	–	372	0.510	–	–	–
Hunt & Reffert	2023	2.49	2.69	2.49	438	–	–	–	–
Kounkel & Covey	2019	0.85	0.38	–	188	–	–	–	–

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

Visualization

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