Collinder 173

0.13 UTI

0.0

C_N

0.03

C_dens

0.12

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 20

Stellar density (N₅₀/rad) 0.2 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.12 Very low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Collinder 173 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a large^* distance, well below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It is poorly studied in the literature, with no articles listed in the last 9 years.

(*): The parallax distance estimate (~5.85 kpc) differs significantly from the median photometric distance (~0.42 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.

Very close Low extinction Near-solar metallicity Very young

Data

🔍 Search references for Collinder 173 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–	120.735	-46.388	0.171	-2.214	4.24	72.465
Loktin & Popova	2017	120.705	-46.382	–	–	–	20.39
Dias et al.	2014	120.704	-46.383	–	-2.95	3.27	20.39
Gozha et al.	2012	120.704	-46.383	–	–	–	–
van den Bergh	2006	120.9	-46.283	–	–	–	–

💡 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–	0.42	0.16	–	14	-0.060	–	–	–
Loktin & Popova	2017	0.41	0.16	–	14	–	–	–	–
Gozha et al.	2012	0.42	–	–	14	-0.060	–	–	–
van den Bergh	2006	0.42	0.16	–	14	–	–	–	–

Visualization

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