ESO 309 03

(MWSC 998)

0.15 UTI

0.0

C_N

0.02

C_dens

0.25

C_C3

0.23

C_lit

1.0

C_dup

N₅₀ (P>50% members) 23

Stellar density (N₅₀/rad) 0.1 [N/pc²]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.02 Very loose
C_C3 0.25 Low quality
C_lit 0.23 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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ESO 309 03 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large^* distance, well below the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~5.91 kpc) differs significantly from the median photometric distance (~2.06 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 Intermediate age

Data

🔍 Search references for ESO 309 03 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–	102.646	-42.404	0.169	-0.765	2.669	68.393
Just et al.	2023	102.659	-42.381	–	–	–	–
Bica et al.	2019	102.671	-42.38	–	–	–	–
Loktin & Popova	2017	102.66	-42.39	–	-0.019	0.452	–
Sampedro et al.	2017	102.662	-42.39	16.85	-40.55	–	–
Kharchenko et al.	2016	102.659	-42.381	–	–	–	–
Kharchenko et al.	2013	102.663	-42.383	–	0.07	-0.35	–
Bukowiecki et al.	2011	102.658	-42.383	–	–	–	–
Dias et al.	2002	102.662	-42.39	–	-0.2	1.93	–

💡 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–	2.06	1.31	–	876	–	84	–	–
Just et al.	2023	–	–	–	1122	–	88	–	–
Loktin & Popova	2017	2.81	0.42	–	1	–	–	–	–
Kharchenko et al.	2016	2.06	1.31	–	1122	–	–	–	–
Kharchenko et al.	2013	2.06	1.31	–	1122	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	79	–	–
Bukowiecki et al.	2011	1.76⁽¹⁾	1.48	–	631	–	–	–	–
Dias et al.	2002	1.75	1.51	–	631	–	–	–	–

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

Visualization

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