Theia 1798

0.08 UTI

0.37

C_N

0.14

C_dens

0.38

C_C3

0.25

C_lit

0.27

C_dup

N₅₀ (P>50% members) 37

Stellar density (N₅₀/rad) 0.7 [N/pc²]

C3 classification CB

C_N 0.37 Poorly populated
C_dens 0.14 Very loose
C_C3 0.38 Low quality
C_lit 0.25 Poorly studied
C_dup 0.27 Possibly duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 1798 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is possibly a duplicate object, which shares a significant percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P562, along with PHOC_34.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 1798 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–	85.472	30.28	0.533	0.47	-2.48	-41.97
Zhang et al.	2024	85.498	30.226	–	–	–	–
Hunt & Reffert	2024	85.498	30.226	0.535	0.438	-2.449	–
Cavallo et al.	2024	85.265	30.494	0.533	–	–	–
Hunt & Reffert	2023	85.498	30.226	0.535	0.438	-2.449	–

💡 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–	1.775	2.14	2.64	72	0.004	161	–	–
Zhang et al.	2024	–	–	–	–	-0.123⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	161⁽¹⁾	–	–
Cavallo et al.	2024	1.84	2.20	–	89	0.130	–	–	–
Hunt & Reffert	2023	1.71	2.08	2.64	54	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 126	73.0	85.48	30.28	0.54	0.47	-2.48	–	0.22

💡 Note: The % column shows the percentage of members that Theia 1798 shares with each listed object.

Visualization

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