Theia 836

0.24 UTI

0.33

C_N

0.23

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 33

Core radius and density 1.4 [pc], 1.1 [pc^-2]

C3 classification BB

C_N 0.33 Poorly populated
C_dens 0.23 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.06 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 836 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

⚠️ 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.

Close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Data

🔍 Search references for Theia 836 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–	289.322	18.399	1.82	0.554	-8.33	-21.217
Hunt & Reffert	2024	289.303	18.42	1.807	0.469	-8.322	-19.538
Cavallo et al.	2024	289.079	18.572	1.818	–	–	–
Hunt & Reffert	2023	289.303	18.42	1.807	0.469	-8.322	-19.538
Kounkel & Covey	2019	289.533	18.976	1.917	–	–	-2.78

💡 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–	0.53	1.34	1.42	104	0.480	88	–	–
Hunt & Reffert	2024	0.53	1.34	1.42	104	–	88⁽¹⁾	–	–
Cavallo et al.	2024	0.57	1.54	–	100	0.480	–	–	–
Hunt & Reffert	2023	0.53	1.34	1.42	104	–	–	–	–
Kounkel & Covey	2019	0.52	0.90	–	417	–	–	–	–

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

Visualization

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