Theia 771

0.45 UTI

0.55

C_N

0.57

C_dens

0.62

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 60

Stellar density (N₅₀/rad) 2.9 [N/pc²]

C3 classification AC

C_N 0.55 Moderately populated
C_dens 0.57 Moderately dense
C_C3 0.62 Intermediate quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 771 is a moderately populated, moderately dense object of intermediate C3 quality. Its parallax locates it at a 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.

Close Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P570, along with Theia_1082.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 771 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–	199.083	-59.231	1.163	-14.952	-1.81	-11.525
Hu & Soubiran	2025	199.533	-59.201	–	–	–	–
Hunt & Reffert	2024	198.889	-59.23	1.164	-14.932	-1.808	-12.502
Cavallo et al.	2024	199.533	-59.201	1.161	–	–	–
Hunt & Reffert	2023	198.889	-59.23	1.164	-14.932	-1.808	-12.502

💡 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–	0.8	0.565	0.56	426	0.250	50	–	–
Hu & Soubiran	2025	–	–	–	–	-0.140⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	50⁽¹⁾	–	–
Cavallo et al.	2024	0.78	0.47	–	525	0.640	–	–	–
Hunt & Reffert	2023	0.82	0.66	0.56	326	–	–	–	–

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

Visualization

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