S1

0.02 UTI

0.0

C_N

0.11

C_dens

0.0

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 19

Stellar density (N₅₀/rad) 0.6 [N/pc²]

C3 classification DD

C_N 0.0 Sparse
C_dens 0.11 Very loose
C_C3 0.0 Very low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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S1 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, near the mid-plane, affected by moderate extinction. It is catalogued as a young cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 12 years.

(*): The parallax distance estimate (~2.94 kpc) differs significantly from the median photometric distance (~2.20 kpc).

⚠️ 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.

Relatively close Moderate extinction Young

Data

🔍 Search references for S1 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–	27.725	61.035	0.34	-3.165	-0.691	-89.952
Dias et al.	2014	27.712	61.091	–	-3.15	-0.79	–
Dias et al.	2002	27.712	61.091	–	-3.15	-0.79	–

💡 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–	2.2	2.39	–	25	–	–	–	–
Dias et al.	2002	2.20	2.39	–	25	–	–	–	–

Visualization

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