Collinder 21

0.22 UTI

0.32

C_N

0.17

C_dens

0.62

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 32

Stellar density (N₅₀/rad) 0.9 [N/pc²]

C3 classification AC

C_N 0.32 Poorly populated
C_dens 0.17 Very loose
C_C3 0.62 Intermediate quality
C_lit 0.0 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 21 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, well below the mid-plane. No fundamental parameter values are available for this object. It is rarely studied in the literature, with no articles listed in the last 39 years.

⚠️ 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.

No fundamental parameters

Dias et al. (2002)
Asterism (Villanova, S. et al. 2004, A&A 428, 67); cat V3.5 (Jan 2016)

Data

🔍 Search references for Collinder 21 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–	27.517	27.247	0.286	0.025	-1.145	–
Lynga	1987	27.531	27.243	–	–	–	–

💡 Note: The UCC values are estimated from its identified members.

Visualization

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