Theia 2812

0.08 UTI

0.47

C_N

1.0

C_dens

0.75

C_C3

0.25

C_lit

0.15

C_dup

N₅₀ (P>50% members) 47

Stellar density (N₅₀/rad) 6.4 [N/pc²]

C3 classification AB

C_N 0.47 Poorly populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 0.15 Likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Theia 2812 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, above 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

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P170, along with Theia_2118.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 2812 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–	101.95	7.654	0.689	-0.608	-2.206	9.533
Zhang et al.	2024	101.987	7.664	–	–	–	–
Hunt & Reffert	2024	101.988	7.664	0.697	-0.596	-2.2	10.297
Cavallo et al.	2024	101.921	7.657	0.696	–	–	–
Hunt & Reffert	2023	101.988	7.664	0.697	-0.596	-2.2	10.297

💡 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–	1.42	0.87	1.73	136	0.101	262	–	–
Zhang et al.	2024	–	–	–	–	-0.109⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	262⁽¹⁾	–	–
Cavallo et al.	2024	1.48	0.99	–	132	0.310	–	–	–
Hunt & Reffert	2023	1.36	0.75	1.73	141	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0342	85.1	101.96	7.66	0.69	-0.61	-2.2	9.53	0.43

💡 Note: The % column shows the percentage of members that Theia 2812 shares with each listed object.

Visualization

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