Collinder 33

0.12 UTI

0.0

C_N

0.09

C_dens

0.12

C_C3

0.19

C_lit

1.0

C_dup

N₅₀ (P>50% members) 10

Stellar density (N₅₀/rad) 0.4 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.09 Very loose
C_C3 0.12 Very low quality
C_lit 0.19 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 33 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, above the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 8 years.

(*): The parallax distance estimate (~2.87 kpc) differs significantly from the median photometric distance (~1.05 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 Collinder 33 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–	44.897	60.422	0.349	-0.432	-0.681	-46.623
Dib et al.	2018	44.815	60.3	–	–	–	–
Joshi et al.	2016	44.815	60.3	–	–	–	–
Piskunov et al.	2008	44.808	60.395	–	–	–	–
Kharchenko et al.	2007	44.82	60.4	–	0.36	–	-6.75
Piskunov et al.	2007	44.808	60.395	–	–	–	–
Kharchenko et al.	2005	44.82	60.4	–	2.7	3.17	-6.75
Kharchenko et al.	2003	44.82	60.4	–	3.62	2.33	–
Lynga	1987	44.835	60.399	–	–	–	–

💡 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–	1.05	1.26	–	229	–	507	–	–
Dib et al.	2018	1.10	–	–	222	–	–	–	–
Joshi et al.	2016	1.10	1.10	–	222	–	562	–	–
Piskunov et al.	2008	1.00	1.26	–	229	–	507⁽¹⁾	–	–
Piskunov et al.	2007	1.00	1.26	–	229	–	150	–	–
Kharchenko et al.	2005	1.00	1.26	–	229	–	–	–	–
Kharchenko et al.	2003	1.11	1.26	–	–	–	–	–	–

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

Visualization

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