Theia 1871

0.09 UTI

0.39

C_N

1.0

C_dens

0.75

C_C3

0.0

C_lit

0.2

C_dup

C3 classification BA

Number of members (P>50%) 39

Radius (P>50% members) 3.2 [arcmin]

C_N 0.39 Poorly populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.0 Rarely studied
C_dup 0.2 Likely duplicate

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

Overview

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Theia 1871 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a moderate^* distance, near the mid-plane, affected by moderate extinction. It is catalogued as a metal-poor, young cluster (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.

(*): The parallax distance estimate (~2.99 kpc) differs significantly from the median photometric distance (~2.20 kpc).

Relatively close Moderate extinction Metal-poor Young

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 1871 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	–	273.52	-19.011	0.334	-0.391	-1.194	-6.44
Hunt & Reffert	2024	273.555	-18.985	0.333	-0.385	-1.206	-35.903
Cavallo et al.	2024	273.508	-19.019	0.332	–	–	–
Hunt & Reffert	2023	273.555	-18.985	0.333	-0.385	-1.206	-35.903

💡 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
Hunt & Reffert	2024	–	–	–	–	–	674*	–	–
Cavallo et al.	2024	1.65	2.05	–	78	-0.520	–	–	–
Hunt & Reffert	2023	2.75	1.70	1.94	98	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 1009	79.5	273.51	-19.03	0.33	-0.35	-1.19	1.49	0.38

💡 Note: The % column shows the percentage of members that Theia 1871 shares with each listed object.

Visualization

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