NGC 3909

(MWSC 1979; ESO 217 08; MWSC 1980)

0.19 UTI

0.0

C_N

0.06

C_dens

0.12

C_C3

0.38

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 22

Radius (P>50% members) 7.1 [arcmin]

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.12 Very low quality
C_lit 0.38 Poorly studied
C_dup 1.0 Unique

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

Overview

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NGC 3909 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, well above the mid-plane, affected by low extinction. It is catalogued as an old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~4.13 kpc) differs significantly from the median photometric distance (~1.79 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 Low extinction Old

Data

🔍 Search references for NGC 3909 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	–	177.543	-48.203	0.242	-5.775	0.439	–
Just et al.	2023	177.518	-48.206	–	–	–	–
Bica et al.	2019	177.521	-48.245	–	–	–	–
Kharchenko et al.	2016	177.518	-48.206	–	–	–	–
Dias et al.	2014	177.454	-48.252	–	-9.69	1.62	–
Kharchenko et al.	2013	177.525	-48.21	–	-8.0	3.92	–
Dias et al.	2002	177.454	-48.252	–	-9.9	1.45	–

💡 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
Just et al.	2023	–	–	–	3273	–	190	–	–
Kharchenko et al.	2016	1.79	0.32	–	3273	–	–	–	–
Kharchenko et al.	2013	1.79	0.32	–	3273	–	–	–	–
Dias et al.	2002	1.10	0.40	–	1995	–	–	–	–

Visualization

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