Collinder 399

0.09 UTI

0.0

C_N

0.01

C_dens

0.38

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 12

Core radius and density 3.4 [pc], 0.05 [pc^-2]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.38 Low quality
C_lit 0.03 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Collinder 399 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large^* distance, above the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~6.48 kpc) differs significantly from the median photometric distance (~0.71 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.

Close Low extinction Intermediate age

Bica et al. (2019)
Asterisms reported by amateur astronomers in the web.

Dias et al. (2002)
Asterism (Baumgardt, H. 1998, A&A 340, 402; Orellana, R. B.; De Biasi, M. S. 2008, RevMexAA 34, 111); cat V3.5 (Jan 2016)

Data

🔍 Search references for Collinder 399 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–	291.321	20.163	0.154	-1.918	-3.867	-77.284
van den Bergh	2006	291.35	20.183	–	–	–	–
Lynga	1987	291.34	20.192	–	–	–	-18.0

💡 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–	0.71	0.68	–	179	–	–	–	–
van den Bergh	2006	1.29	1.20	–	158	–	–	–	–
Lynga	1987	0.13	0.16	–	200	–	–	–	–

Visualization

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