Collinder 285

(MWSC 2242)

0.18 UTI

0.25

C_N

0.16

C_dens

0.0

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 0.8 [N/pc²]

C3 classification DD

C_N 0.25 Poorly populated
C_dens 0.16 Very loose
C_C3 0.0 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 285 is a poorly populated, very loose object of very low C3 quality. Its parallax locates it at a relatively close^* distance, well above the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is poorly studied in the literature, with no articles listed in the last 10 years.

(*): The parallax distance estimate (~1.80 kpc) differs significantly from the median photometric distance (~0.03 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 Intermediate age

Data

🔍 Search references for Collinder 285 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–	220.238	69.595	0.556	-9.928	2.554	–
Kharchenko et al.	2016	220.276	69.569	–	–	–	–
Kharchenko et al.	2007	220.27	69.57	–	12.0	–	–
van den Bergh	2006	220.225	69.567	–	–	–	–
Dias et al.	2002	220.275	69.567	–	–	–	–

💡 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–	0.03	0.0	–	200	–	–	–	–
Kharchenko et al.	2016	0.03	0.00	–	200	–	–	–	–
van den Bergh	2006	0.03	0.00	–	200	–	–	–	–
Dias et al.	2002	0.03	0.00	–	200	–	–	–	–

Visualization

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